Container (Sample Document)

java.lang.Object
- java.awt.Component
- - java.awt.Container

All Implemented Interfaces:

java.awt.image.ImageObserver, MenuContainer, java.io.Serializable

Direct Known Subclasses:

Panel, ScrollPane, Window

public class Container extends Component

A generic Abstract Window Toolkit(AWT) container object is a component that can contain other AWT components.
Components added to a container are tracked in a list. The order of the list will define the components' front-to-back stacking order within the container. If no index is specified when adding a component to a container, it will be added to the end of the list (and hence to the bottom of the stacking order).
Note: For details on the focus subsystem, see How to Use the Focus Subsystem, a section in The Java Tutorial, and the Focus Specification for more information.

Since:

JDK1.0

See Also:
add(java.awt.Component, int), getComponent(int), LayoutManager, Serialized Form

Nested Classes
	Modifier and Type	Class and Description
	AccessibleAWTComponent	`protected class` AccessibleAWTComponent Inner class of Component used to provide default support for accessibility. `protected class` AccessibleAWTComponent Inner class of Component used to provide default support for accessibility. This class is not meant to be used directly by application developers, but is instead meant only to be subclassed by component developers. The class used to obtain the accessible role for this object. Since: 1.3 See Also: Serialized Form
	BaselineResizeBehavior	`static class` BaselineResizeBehavior Enumeration of the common ways the baseline of a component can change as the size changes. `static class` BaselineResizeBehavior Enumeration of the common ways the baseline of a component can change as the size changes. The baseline resize behavior is primarily for layout managers that need to know how the position of the baseline changes as the component size changes. In general the baseline resize behavior will be valid for sizes greater than or equal to the minimum size (the actual minimum size; not a developer specified minimum size). For sizes smaller than the minimum size the baseline may change in a way other than the baseline resize behavior indicates. Similarly, as the size approaches `Integer.MAX_VALUE` and/or `Short.MAX_VALUE` the baseline may change in a way other than the baseline resize behavior indicates. Since: 1.6 See Also: `Component.getBaselineResizeBehavior()`, `Component.getBaseline(int,int)`
	BltBufferStrategy	`protected class` BltBufferStrategy Inner class for blitting offscreen surfaces to a component. `protected class` BltBufferStrategy Inner class for blitting offscreen surfaces to a component. Since: 1.4
	FlipBufferStrategy	`protected class` FlipBufferStrategy Inner class for flipping buffers on a component. `protected class` FlipBufferStrategy Inner class for flipping buffers on a component. That component must be a `Canvas` or `Window`. Since: 1.4 See Also: `Canvas`, `Window`, `BufferStrategy`
	AccessibleAWTContainer	`protected class` AccessibleAWTContainer Inner class of Container used to provide default support for accessibility. `protected class` AccessibleAWTContainer Inner class of Container used to provide default support for accessibility. This class is not meant to be used directly by application developers, but is instead meant only to be subclassed by container developers. The class used to obtain the accessible role for this object, as well as implementing many of the methods in the AccessibleContainer interface. Since: 1.3 See Also: Serialized Form

Fields
	Modifier and Type	Field and Description
	ABORT	`static int` ABORT This flag in the infoflags argument to imageUpdate indicates that an image which was being tracked asynchronously was aborted before production was complete. public static final int ABORT This flag in the infoflags argument to imageUpdate indicates that an image which was being tracked asynchronously was aborted before production was complete. No more information will become available without further action to trigger another image production sequence. If the ERROR flag was not also set in this image update, then accessing any of the data in the image will restart the production again, probably from the beginning. See Also: `ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)`, Constant Field Values
	ALLBITS	`static int` ALLBITS This flag in the infoflags argument to imageUpdate indicates that a static image which was previously drawn is now complete and can be drawn again in its final form. public static final int ALLBITS This flag in the infoflags argument to imageUpdate indicates that a static image which was previously drawn is now complete and can be drawn again in its final form. The x, y, width, and height arguments to the imageUpdate callback method should be ignored. See Also: `Graphics.drawImage(java.awt.Image, int, int, java.awt.image.ImageObserver)`, `ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)`, Constant Field Values
	BOTTOM_ALIGNMENT	`static float` BOTTOM_ALIGNMENT Ease-of-use constant for `getAlignmentY`. public static final float BOTTOM_ALIGNMENT Ease-of-use constant for `getAlignmentY`. Specifies an alignment to the bottom of the component. See Also: `Component.getAlignmentY()`, Constant Field Values
	CENTER_ALIGNMENT	`static float` CENTER_ALIGNMENT Ease-of-use constant for `getAlignmentY` and `getAlignmentX`. public static final float CENTER_ALIGNMENT Ease-of-use constant for `getAlignmentY` and `getAlignmentX`. Specifies an alignment to the center of the component See Also: `Component.getAlignmentX()`, `Component.getAlignmentY()`, Constant Field Values
	ERROR	`static int` ERROR This flag in the infoflags argument to imageUpdate indicates that an image which was being tracked asynchronously has encountered an error. public static final int ERROR This flag in the infoflags argument to imageUpdate indicates that an image which was being tracked asynchronously has encountered an error. No further information will become available and drawing the image will fail. As a convenience, the ABORT flag will be indicated at the same time to indicate that the image production was aborted. See Also: `ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)`, Constant Field Values
	FRAMEBITS	`static int` FRAMEBITS This flag in the infoflags argument to imageUpdate indicates that another complete frame of a multi-frame image which was previously drawn is now available to be drawn again. public static final int FRAMEBITS This flag in the infoflags argument to imageUpdate indicates that another complete frame of a multi-frame image which was previously drawn is now available to be drawn again. The x, y, width, and height arguments to the imageUpdate callback method should be ignored. See Also: `Graphics.drawImage(java.awt.Image, int, int, java.awt.image.ImageObserver)`, `ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)`, Constant Field Values
	HEIGHT	`static int` HEIGHT This flag in the infoflags argument to imageUpdate indicates that the height of the base image is now available and can be taken from the height argument to the imageUpdate callback method. public static final int HEIGHT This flag in the infoflags argument to imageUpdate indicates that the height of the base image is now available and can be taken from the height argument to the imageUpdate callback method. See Also: `Image.getHeight(java.awt.image.ImageObserver)`, `ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)`, Constant Field Values
	LEFT_ALIGNMENT	`static float` LEFT_ALIGNMENT Ease-of-use constant for `getAlignmentX`. public static final float LEFT_ALIGNMENT Ease-of-use constant for `getAlignmentX`. Specifies an alignment to the left side of the component. See Also: `Component.getAlignmentX()`, Constant Field Values
	PROPERTIES	`static int` PROPERTIES This flag in the infoflags argument to imageUpdate indicates that the properties of the image are now available. public static final int PROPERTIES This flag in the infoflags argument to imageUpdate indicates that the properties of the image are now available. See Also: `Image.getProperty(java.lang.String, java.awt.image.ImageObserver)`, `ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)`, Constant Field Values
	RIGHT_ALIGNMENT	`static float` RIGHT_ALIGNMENT Ease-of-use constant for `getAlignmentX`. public static final float RIGHT_ALIGNMENT Ease-of-use constant for `getAlignmentX`. Specifies an alignment to the right side of the component. See Also: `Component.getAlignmentX()`, Constant Field Values
	SOMEBITS	`static int` SOMEBITS This flag in the infoflags argument to imageUpdate indicates that more pixels needed for drawing a scaled variation of the image are available. public static final int SOMEBITS This flag in the infoflags argument to imageUpdate indicates that more pixels needed for drawing a scaled variation of the image are available. The bounding box of the new pixels can be taken from the x, y, width, and height arguments to the imageUpdate callback method. See Also: `Graphics.drawImage(java.awt.Image, int, int, java.awt.image.ImageObserver)`, `ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)`, Constant Field Values
	TOP_ALIGNMENT	`static float` TOP_ALIGNMENT Ease-of-use constant for `getAlignmentY()`. public static final float TOP_ALIGNMENT Ease-of-use constant for `getAlignmentY()`. Specifies an alignment to the top of the component. See Also: `Component.getAlignmentY()`, Constant Field Values
	WIDTH	`static int` WIDTH This flag in the infoflags argument to imageUpdate indicates that the width of the base image is now available and can be taken from the width argument to the imageUpdate callback method. public static final int WIDTH This flag in the infoflags argument to imageUpdate indicates that the width of the base image is now available and can be taken from the width argument to the imageUpdate callback method. See Also: `Image.getWidth(java.awt.image.ImageObserver)`, `ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)`, Constant Field Values

Constructors
	Constructor and Description
	Container	Container() Constructs a new Container. public Container() Constructs a new Container. Containers can be extended directly, but are lightweight in this case and must be contained by a parent somewhere higher up in the component tree that is native. (such as Frame for example).

Basic Attribute Methods
Modifier and Type	Method and Description
	applyComponentOrientation	`void` applyComponentOrientation(ComponentOrientation o) Sets the `ComponentOrientation` property of this container and all components contained within it. public void applyComponentOrientation(ComponentOrientation o) Sets the `ComponentOrientation` property of this container and all components contained within it. This method changes layout-related information, and therefore, invalidates the component hierarchy. Overrides: `applyComponentOrientation` in class `Component` Parameters: `o` - the new component orientation of this container and the components contained within it. Throws: `java.lang.NullPointerException` - if `orientation` is null. Since: 1.4 See Also: `Component.setComponentOrientation(java.awt.ComponentOrientation)`, `Component.getComponentOrientation()`, `invalidate()`
	disable	`void` disable() Deprecated. As of JDK version 1.1, replaced by `setEnabled(boolean)`. @Deprecated public void disable() Deprecated. As of JDK version 1.1, replaced by `setEnabled(boolean)`.
	enable	`void` enable() Deprecated. As of JDK version 1.1, replaced by `setEnabled(boolean)`. @Deprecated public void enable() Deprecated. As of JDK version 1.1, replaced by `setEnabled(boolean)`.
	enable	`void` enable(boolean b) Deprecated. As of JDK version 1.1, replaced by `setEnabled(boolean)`. @Deprecated public void enable(boolean b) Deprecated. As of JDK version 1.1, replaced by `setEnabled(boolean)`.
	enableInputMethods	`void` enableInputMethods(boolean enable) Enables or disables input method support for this component. public void enableInputMethods(boolean enable) Description copied from class: `Component` Enables or disables input method support for this component. If input method support is enabled and the component also processes key events, incoming events are offered to the current input method and will only be processed by the component or dispatched to its listeners if the input method does not consume them. By default, input method support is enabled. Parameters: `enable` - true to enable, false to disable Since: 1.2 See Also: `Component.processKeyEvent(java.awt.event.KeyEvent)`
	getAccessibleContext	`javax.accessibility.AccessibleContext` getAccessibleContext() Gets the `AccessibleContext` associated with this `Component`. public javax.accessibility.AccessibleContext getAccessibleContext() Description copied from class: `Component` Gets the `AccessibleContext` associated with this `Component`. The method implemented by this base class returns null. Classes that extend `Component` should implement this method to return the `AccessibleContext` associated with the subclass. Returns: the `AccessibleContext` of this `Component` Since: 1.3
	getBackground	`Color` getBackground() Gets the background color of this component. public Color getBackground() Description copied from class: `Component` Gets the background color of this component. Returns: this component's background color; if this component does not have a background color, the background color of its parent is returned Since: JDK1.0 See Also: `Component.setBackground(java.awt.Color)`
	getColorModel	`java.awt.image.ColorModel` getColorModel() Gets the instance of `ColorModel` used to display the component on the output device. public java.awt.image.ColorModel getColorModel() Description copied from class: `Component` Gets the instance of `ColorModel` used to display the component on the output device. Returns: the color model used by this component Since: JDK1.0 See Also: `ColorModel`, `ComponentPeer.getColorModel()`, `Toolkit.getColorModel()`
	getComponentOrientation	`ComponentOrientation` getComponentOrientation() Retrieves the language-sensitive orientation that is to be used to order the elements or text within this component. public ComponentOrientation getComponentOrientation() Description copied from class: `Component` Retrieves the language-sensitive orientation that is to be used to order the elements or text within this component. `LayoutManager` and `Component` subclasses that wish to respect orientation should call this method to get the component's orientation before performing layout or drawing. See Also: `ComponentOrientation`
	getCursor	`Cursor` getCursor() Gets the cursor set in the component. public Cursor getCursor() Description copied from class: `Component` Gets the cursor set in the component. If the component does not have a cursor set, the cursor of its parent is returned. If no cursor is set in the entire hierarchy, `Cursor.DEFAULT_CURSOR` is returned. Since: JDK1.1 See Also: `Component.setCursor(java.awt.Cursor)`
	getFont	`Font` getFont() Gets the font of this component. public Font getFont() Description copied from class: `Component` Gets the font of this component. Specified by: `getFont` in interface `MenuContainer` Returns: this component's font; if a font has not been set for this component, the font of its parent is returned Since: JDK1.0 See Also: `Component.setFont(java.awt.Font)`
	getForeground	`Color` getForeground() Gets the foreground color of this component. public Color getForeground() Description copied from class: `Component` Gets the foreground color of this component. Returns: this component's foreground color; if this component does not have a foreground color, the foreground color of its parent is returned Since: JDK1.0 See Also: `Component.setForeground(java.awt.Color)`
	getLocale	`java.util.Locale` getLocale() Gets the locale of this component. public java.util.Locale getLocale() Description copied from class: `Component` Gets the locale of this component. Returns: this component's locale; if this component does not have a locale, the locale of its parent is returned Throws: `IllegalComponentStateException` - if the `Component` does not have its own locale and has not yet been added to a containment hierarchy such that the locale can be determined from the containing parent Since: JDK1.1 See Also: `Component.setLocale(java.util.Locale)`
	getName	`java.lang.String` getName() Gets the name of the component. public java.lang.String getName() Description copied from class: `Component` Gets the name of the component. Returns: this component's name Since: JDK1.1 See Also: `Component.setName(java.lang.String)`
	getParent	`Container` getParent() Gets the parent of this component. public Container getParent() Description copied from class: `Component` Gets the parent of this component. Returns: the parent container of this component Since: JDK1.0
	hide	`void` hide() Deprecated. As of JDK version 1.1, replaced by `setVisible(boolean)`. @Deprecated public void hide() Deprecated. As of JDK version 1.1, replaced by `setVisible(boolean)`.
	isBackgroundSet	`boolean` isBackgroundSet() Returns whether the background color has been explicitly set for this Component. public boolean isBackgroundSet() Description copied from class: `Component` Returns whether the background color has been explicitly set for this Component. If this method returns `false`, this Component is inheriting its background color from an ancestor. Returns: `true` if the background color has been explicitly set for this Component; `false` otherwise. Since: 1.4
	isCursorSet	`boolean` isCursorSet() Returns whether the cursor has been explicitly set for this Component. public boolean isCursorSet() Description copied from class: `Component` Returns whether the cursor has been explicitly set for this Component. If this method returns `false`, this Component is inheriting its cursor from an ancestor. Returns: `true` if the cursor has been explicitly set for this Component; `false` otherwise. Since: 1.4
	isDisplayable	`boolean` isDisplayable() Determines whether this component is displayable. public boolean isDisplayable() Description copied from class: `Component` Determines whether this component is displayable. A component is displayable when it is connected to a native screen resource. A component is made displayable either when it is added to a displayable containment hierarchy or when its containment hierarchy is made displayable. A containment hierarchy is made displayable when its ancestor window is either packed or made visible. A component is made undisplayable either when it is removed from a displayable containment hierarchy or when its containment hierarchy is made undisplayable. A containment hierarchy is made undisplayable when its ancestor window is disposed. Returns: `true` if the component is displayable, `false` otherwise Since: 1.2 See Also: `add(Component)`, `Window.pack()`, `Window.show()`, `remove(Component)`, `Window.dispose()`
	isDoubleBuffered	`boolean` isDoubleBuffered() Returns true if this component is painted to an offscreen image ("buffer") that's copied to the screen later. public boolean isDoubleBuffered() Description copied from class: `Component` Returns true if this component is painted to an offscreen image ("buffer") that's copied to the screen later. Component subclasses that support double buffering should override this method to return true if double buffering is enabled. Returns: false by default
	isEnabled	`boolean` isEnabled() Determines whether this component is enabled. public boolean isEnabled() Description copied from class: `Component` Determines whether this component is enabled. An enabled component can respond to user input and generate events. Components are enabled initially by default. A component may be enabled or disabled by calling its `setEnabled` method. Returns: `true` if the component is enabled, `false` otherwise Since: JDK1.0 See Also: `Component.setEnabled(boolean)`
	isFontSet	`boolean` isFontSet() Returns whether the font has been explicitly set for this Component. public boolean isFontSet() Description copied from class: `Component` Returns whether the font has been explicitly set for this Component. If this method returns `false`, this Component is inheriting its font from an ancestor. Returns: `true` if the font has been explicitly set for this Component; `false` otherwise. Since: 1.4
	isForegroundSet	`boolean` isForegroundSet() Returns whether the foreground color has been explicitly set for this Component. public boolean isForegroundSet() Description copied from class: `Component` Returns whether the foreground color has been explicitly set for this Component. If this method returns `false`, this Component is inheriting its foreground color from an ancestor. Returns: `true` if the foreground color has been explicitly set for this Component; `false` otherwise. Since: 1.4
	isLightweight	`boolean` isLightweight() A lightweight component doesn't have a native toolkit peer. public boolean isLightweight() Description copied from class: `Component` A lightweight component doesn't have a native toolkit peer. Subclasses of `Component` and `Container`, other than the ones defined in this package like `Button` or `Scrollbar`, are lightweight. All of the Swing components are lightweights. This method will always return `false` if this component is not displayable because it is impossible to determine the weight of an undisplayable component. Returns: true if this component has a lightweight peer; false if it has a native peer or no peer Since: 1.2 See Also: `Component.isDisplayable()`
	isOpaque	`boolean` isOpaque() Returns true if this component is completely opaque, returns false by default. public boolean isOpaque() Description copied from class: `Component` Returns true if this component is completely opaque, returns false by default. An opaque component paints every pixel within its rectangular region. A non-opaque component paints only some of its pixels, allowing the pixels underneath it to "show through". A component that does not fully paint its pixels therefore provides a degree of transparency. Subclasses that guarantee to always completely paint their contents should override this method and return true. Returns: true if this component is completely opaque Since: 1.2 See Also: `Component.isLightweight()`
	isShowing	`boolean` isShowing() Determines whether this component is showing on screen. public boolean isShowing() Description copied from class: `Component` Determines whether this component is showing on screen. This means that the component must be visible, and it must be in a container that is visible and showing. Note: sometimes there is no way to detect whether the `Component` is actually visible to the user. This can happen when: the component has been added to a visible `ScrollPane` but the `Component` is not currently in the scroll pane's view port. the `Component` is obscured by another `Component` or `Container`. Returns: `true` if the component is showing, `false` otherwise Since: JDK1.0 See Also: `Component.setVisible(boolean)`
	isVisible	`boolean` isVisible() Determines whether this component should be visible when its parent is visible. public boolean isVisible() Description copied from class: `Component` Determines whether this component should be visible when its parent is visible. Components are initially visible, with the exception of top level components such as `Frame` objects. Returns: `true` if the component is visible, `false` otherwise Since: JDK1.0 See Also: `Component.setVisible(boolean)`
	setBackground	`void` setBackground(Color c) Sets the background color of this component. public void setBackground(Color c) Description copied from class: `Component` Sets the background color of this component. The background color affects each component differently and the parts of the component that are affected by the background color may differ between operating systems. Parameters: `c` - the color to become this component's color; if this parameter is `null`, then this component will inherit the background color of its parent Since: JDK1.0 See Also: `Component.getBackground()`
	setComponentOrientation	`void` setComponentOrientation(ComponentOrientation o) Sets the language-sensitive orientation that is to be used to order the elements or text within this component. public void setComponentOrientation(ComponentOrientation o) Description copied from class: `Component` Sets the language-sensitive orientation that is to be used to order the elements or text within this component. Language-sensitive `LayoutManager` and `Component` subclasses will use this property to determine how to lay out and draw components. At construction time, a component's orientation is set to `ComponentOrientation.UNKNOWN`, indicating that it has not been specified explicitly. The UNKNOWN orientation behaves the same as `ComponentOrientation.LEFT_TO_RIGHT`. To set the orientation of a single component, use this method. To set the orientation of an entire component hierarchy, use `applyComponentOrientation`. This method changes layout-related information, and therefore, invalidates the component hierarchy. See Also: `ComponentOrientation`, `Component.invalidate()`
	setCursor	`void` setCursor(Cursor cursor) Sets the cursor image to the specified cursor. public void setCursor(Cursor cursor) Description copied from class: `Component` Sets the cursor image to the specified cursor. This cursor image is displayed when the `contains` method for this component returns true for the current cursor location, and this Component is visible, displayable, and enabled. Setting the cursor of a `Container` causes that cursor to be displayed within all of the container's subcomponents, except for those that have a non-`null` cursor. The method may have no visual effect if the Java platform implementation and/or the native system do not support changing the mouse cursor shape. Parameters: `cursor` - One of the constants defined by the `Cursor` class; if this parameter is `null` then this component will inherit the cursor of its parent Since: JDK1.1 See Also: `Component.isEnabled()`, `Component.isShowing()`, `Component.getCursor()`, `Component.contains(int, int)`, `Toolkit.createCustomCursor(java.awt.Image, java.awt.Point, java.lang.String)`, `Cursor`
	setEnabled	`void` setEnabled(boolean b) Enables or disables this component, depending on the value of the parameter `b`. public void setEnabled(boolean b) Description copied from class: `Component` Enables or disables this component, depending on the value of the parameter `b`. An enabled component can respond to user input and generate events. Components are enabled initially by default. Note: Disabling a lightweight component does not prevent it from receiving MouseEvents. Note: Disabling a heavyweight container prevents all components in this container from receiving any input events. But disabling a lightweight container affects only this container. Parameters: `b` - If `true`, this component is enabled; otherwise this component is disabled Since: JDK1.1 See Also: `Component.isEnabled()`, `Component.isLightweight()`
	setFont	`void` setFont(Font f) Sets the font of this container. public void setFont(Font f) Sets the font of this container. This method changes layout-related information, and therefore, invalidates the component hierarchy. Overrides: `setFont` in class `Component` Parameters: `f` - The font to become this container's font. Since: JDK1.0 See Also: `Component.getFont()`, `invalidate()`
	setForeground	`void` setForeground(Color c) Sets the foreground color of this component. public void setForeground(Color c) Description copied from class: `Component` Sets the foreground color of this component. Parameters: `c` - the color to become this component's foreground color; if this parameter is `null` then this component will inherit the foreground color of its parent Since: JDK1.0 See Also: `Component.getForeground()`
	setLocale	`void` setLocale(java.util.Locale l) Sets the locale of this component. public void setLocale(java.util.Locale l) Description copied from class: `Component` Sets the locale of this component. This is a bound property. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `l` - the locale to become this component's locale Since: JDK1.1 See Also: `Component.getLocale()`, `Component.invalidate()`
	setName	`void` setName(java.lang.String name) Sets the name of the component to the specified string. public void setName(java.lang.String name) Description copied from class: `Component` Sets the name of the component to the specified string. Parameters: `name` - the string that is to be this component's name Since: JDK1.1 See Also: `Component.getName()`
	setVisible	`void` setVisible(boolean b) Shows or hides this component depending on the value of parameter `b`. public void setVisible(boolean b) Description copied from class: `Component` Shows or hides this component depending on the value of parameter `b`. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `b` - if `true`, shows this component; otherwise, hides this component Since: JDK1.1 See Also: `Component.isVisible()`, `Component.invalidate()`
	show	`void` show() Deprecated. As of JDK version 1.1, replaced by `setVisible(boolean)`. @Deprecated public void show() Deprecated. As of JDK version 1.1, replaced by `setVisible(boolean)`.
	show	`void` show(boolean b) Deprecated. As of JDK version 1.1, replaced by `setVisible(boolean)`. @Deprecated public void show(boolean b) Deprecated. As of JDK version 1.1, replaced by `setVisible(boolean)`.

Event Support Methods
Modifier and Type	Method and Description
	action	`boolean` action(Event evt, java.lang.Object what) Deprecated. As of JDK version 1.1, should register this component as ActionListener on component which fires action events. @Deprecated public boolean action(Event evt, java.lang.Object what) Deprecated. As of JDK version 1.1, should register this component as ActionListener on component which fires action events.
	coalesceEvents	`protected AWTEvent` coalesceEvents(AWTEvent existingEvent, AWTEvent newEvent) Potentially coalesce an event being posted with an existing event. protected AWTEvent coalesceEvents(AWTEvent existingEvent, AWTEvent newEvent) Description copied from class: `Component` Potentially coalesce an event being posted with an existing event. This method is called by `EventQueue.postEvent` if an event with the same ID as the event to be posted is found in the queue (both events must have this component as their source). This method either returns a coalesced event which replaces the existing event (and the new event is then discarded), or `null` to indicate that no combining should be done (add the second event to the end of the queue). Either event parameter may be modified and returned, as the other one is discarded unless `null` is returned. This implementation of `coalesceEvents` coalesces two event types: mouse move (and drag) events, and paint (and update) events. For mouse move events the last event is always returned, causing intermediate moves to be discarded. For paint events, the new event is coalesced into a complex `RepaintArea` in the peer. The new `AWTEvent` is always returned. Parameters: `existingEvent` - the event already on the `EventQueue` `newEvent` - the event being posted to the `EventQueue` Returns: a coalesced event, or `null` indicating that no coalescing was done
	deliverEvent	`void` deliverEvent(Event e) Deprecated. As of JDK version 1.1, replaced by `dispatchEvent(AWTEvent e)` @Deprecated public void deliverEvent(Event e) Deprecated. As of JDK version 1.1, replaced by `dispatchEvent(AWTEvent e)`
	disableEvents	`protected void` disableEvents(long eventsToDisable) Disables the events defined by the specified event mask parameter from being delivered to this component. protected final void disableEvents(long eventsToDisable) Description copied from class: `Component` Disables the events defined by the specified event mask parameter from being delivered to this component. Parameters: `eventsToDisable` - the event mask defining the event types Since: JDK1.1 See Also: `Component.enableEvents(long)`
	dispatchEvent	`void` dispatchEvent(AWTEvent e) Dispatches an event to this component or one of its sub components. public final void dispatchEvent(AWTEvent e) Description copied from class: `Component` Dispatches an event to this component or one of its sub components. Calls `processEvent` before returning for 1.1-style events which have been enabled for the `Component`. Parameters: `e` - the event
	enableEvents	`protected void` enableEvents(long eventsToEnable) Enables the events defined by the specified event mask parameter to be delivered to this component. protected final void enableEvents(long eventsToEnable) Description copied from class: `Component` Enables the events defined by the specified event mask parameter to be delivered to this component. Event types are automatically enabled when a listener for that event type is added to the component. This method only needs to be invoked by subclasses of `Component` which desire to have the specified event types delivered to `processEvent` regardless of whether or not a listener is registered. Parameters: `eventsToEnable` - the event mask defining the event types Since: JDK1.1 See Also: `Component.processEvent(java.awt.AWTEvent)`, `Component.disableEvents(long)`, `AWTEvent`
	firePropertyChange	`protected void` firePropertyChange(java.lang.String propertyName, boolean oldValue, boolean newValue) Support for reporting bound property changes for boolean properties. protected void firePropertyChange(java.lang.String propertyName, boolean oldValue, boolean newValue) Description copied from class: `Component` Support for reporting bound property changes for boolean properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners. Parameters: `propertyName` - the property whose value has changed `oldValue` - the property's previous value `newValue` - the property's new value Since: 1.4
	firePropertyChange	`void` firePropertyChange(java.lang.String propertyName, byte oldValue, byte newValue) Reports a bound property change. public void firePropertyChange(java.lang.String propertyName, byte oldValue, byte newValue) Description copied from class: `Component` Reports a bound property change. Parameters: `propertyName` - the programmatic name of the property that was changed `oldValue` - the old value of the property (as a byte) `newValue` - the new value of the property (as a byte) Since: 1.5 See Also: `Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)`
	firePropertyChange	`void` firePropertyChange(java.lang.String propertyName, char oldValue, char newValue) Reports a bound property change. public void firePropertyChange(java.lang.String propertyName, char oldValue, char newValue) Description copied from class: `Component` Reports a bound property change. Parameters: `propertyName` - the programmatic name of the property that was changed `oldValue` - the old value of the property (as a char) `newValue` - the new value of the property (as a char) Since: 1.5 See Also: `Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)`
	firePropertyChange	`void` firePropertyChange(java.lang.String propertyName, double oldValue, double newValue) Reports a bound property change. public void firePropertyChange(java.lang.String propertyName, double oldValue, double newValue) Description copied from class: `Component` Reports a bound property change. Parameters: `propertyName` - the programmatic name of the property that was changed `oldValue` - the old value of the property (as a double) `newValue` - the new value of the property (as a double) Since: 1.5 See Also: `Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)`
	firePropertyChange	`void` firePropertyChange(java.lang.String propertyName, float oldValue, float newValue) Reports a bound property change. public void firePropertyChange(java.lang.String propertyName, float oldValue, float newValue) Description copied from class: `Component` Reports a bound property change. Parameters: `propertyName` - the programmatic name of the property that was changed `oldValue` - the old value of the property (as a float) `newValue` - the new value of the property (as a float) Since: 1.5 See Also: `Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)`
	firePropertyChange	`protected void` firePropertyChange(java.lang.String propertyName, int oldValue, int newValue) Support for reporting bound property changes for integer properties. protected void firePropertyChange(java.lang.String propertyName, int oldValue, int newValue) Description copied from class: `Component` Support for reporting bound property changes for integer properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners. Parameters: `propertyName` - the property whose value has changed `oldValue` - the property's previous value `newValue` - the property's new value Since: 1.4
	firePropertyChange	`void` firePropertyChange(java.lang.String propertyName, long oldValue, long newValue) Reports a bound property change. public void firePropertyChange(java.lang.String propertyName, long oldValue, long newValue) Description copied from class: `Component` Reports a bound property change. Parameters: `propertyName` - the programmatic name of the property that was changed `oldValue` - the old value of the property (as a long) `newValue` - the new value of the property (as a long) Since: 1.5 See Also: `Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)`
	firePropertyChange	`protected void` firePropertyChange(java.lang.String propertyName, java.lang.Object oldValue, java.lang.Object newValue) Support for reporting bound property changes for Object properties. protected void firePropertyChange(java.lang.String propertyName, java.lang.Object oldValue, java.lang.Object newValue) Description copied from class: `Component` Support for reporting bound property changes for Object properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners. Parameters: `propertyName` - the property whose value has changed `oldValue` - the property's previous value `newValue` - the property's new value
	firePropertyChange	`void` firePropertyChange(java.lang.String propertyName, short oldValue, short newValue) Reports a bound property change. public void firePropertyChange(java.lang.String propertyName, short oldValue, short newValue) Description copied from class: `Component` Reports a bound property change. Parameters: `propertyName` - the programmatic name of the property that was changed `oldValue` - the old value of the property (as a short) `newValue` - the old value of the property (as a short) Since: 1.5 See Also: `Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)`
	getListeners	`<T extends java.util.EventListener> T[]` getListeners(java.lang.Class<T> listenerType) Returns an array of all the objects currently registered as `FooListener`s upon this `Container`. public <T extends java.util.EventListener> T[] getListeners(java.lang.Class<T> listenerType) Returns an array of all the objects currently registered as `FooListener`s upon this `Container`. `FooListener`s are registered using the `addFooListener` method. You can specify the `listenerType` argument with a class literal, such as `FooListener.class`. For example, you can query a `Container` `c` for its container listeners with the following code: ContainerListener[] cls = (ContainerListener[])(c.getListeners(ContainerListener.class)); If no such listeners exist, this method returns an empty array. Overrides: `getListeners` in class `Component` Parameters: `listenerType` - the type of listeners requested; this parameter should specify an interface that descends from `java.util.EventListener` Returns: an array of all objects registered as `FooListener`s on this container, or an empty array if no such listeners have been added Throws: `java.lang.ClassCastException` - if `listenerType` doesn't specify a class or interface that implements `java.util.EventListener` `java.lang.NullPointerException` - if `listenerType` is `null` Since: 1.3 See Also: `getContainerListeners()`
	handleEvent	`boolean` handleEvent(Event evt) Deprecated. As of JDK version 1.1 replaced by processEvent(AWTEvent). @Deprecated public boolean handleEvent(Event evt) Deprecated. As of JDK version 1.1 replaced by processEvent(AWTEvent).
	keyDown	`boolean` keyDown(Event evt, int key) Deprecated. As of JDK version 1.1, replaced by processKeyEvent(KeyEvent). @Deprecated public boolean keyDown(Event evt, int key) Deprecated. As of JDK version 1.1, replaced by processKeyEvent(KeyEvent).
	keyUp	`boolean` keyUp(Event evt, int key) Deprecated. As of JDK version 1.1, replaced by processKeyEvent(KeyEvent). @Deprecated public boolean keyUp(Event evt, int key) Deprecated. As of JDK version 1.1, replaced by processKeyEvent(KeyEvent).
	mouseDown	`boolean` mouseDown(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent). @Deprecated public boolean mouseDown(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent).
	mouseDrag	`boolean` mouseDrag(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseMotionEvent(MouseEvent). @Deprecated public boolean mouseDrag(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseMotionEvent(MouseEvent).
	mouseEnter	`boolean` mouseEnter(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent). @Deprecated public boolean mouseEnter(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent).
	mouseExit	`boolean` mouseExit(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent). @Deprecated public boolean mouseExit(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent).
	mouseMove	`boolean` mouseMove(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseMotionEvent(MouseEvent). @Deprecated public boolean mouseMove(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseMotionEvent(MouseEvent).
	mouseUp	`boolean` mouseUp(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent). @Deprecated public boolean mouseUp(Event evt, int x, int y) Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent).
	postEvent	`boolean` postEvent(Event e) Deprecated. As of JDK version 1.1, replaced by dispatchEvent(AWTEvent). @Deprecated public boolean postEvent(Event e) Deprecated. As of JDK version 1.1, replaced by dispatchEvent(AWTEvent).
	processComponentEvent	`protected void` processComponentEvent(ComponentEvent e) Processes component events occurring on this component by dispatching them to any registered `ComponentListener` objects. protected void processComponentEvent(ComponentEvent e) Description copied from class: `Component` Processes component events occurring on this component by dispatching them to any registered `ComponentListener` objects. This method is not called unless component events are enabled for this component. Component events are enabled when one of the following occurs: A `ComponentListener` object is registered via `addComponentListener`. Component events are enabled via `enableEvents`. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the component event Since: JDK1.1 See Also: `ComponentEvent`, `ComponentListener`, `Component.addComponentListener(java.awt.event.ComponentListener)`, `Component.enableEvents(long)`
	processContainerEvent	`protected void` processContainerEvent(ContainerEvent e) Processes container events occurring on this container by dispatching them to any registered ContainerListener objects. protected void processContainerEvent(ContainerEvent e) Processes container events occurring on this container by dispatching them to any registered ContainerListener objects. NOTE: This method will not be called unless container events are enabled for this component; this happens when one of the following occurs: A ContainerListener object is registered via `addContainerListener` Container events are enabled via `enableEvents` Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the container event See Also: `Component.enableEvents(long)`
	processEvent	`protected void` processEvent(AWTEvent e) Processes events on this container. protected void processEvent(AWTEvent e) Processes events on this container. If the event is a `ContainerEvent`, it invokes the `processContainerEvent` method, else it invokes its superclass's `processEvent`. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Overrides: `processEvent` in class `Component` Parameters: `e` - the event See Also: `Component.processComponentEvent(java.awt.event.ComponentEvent)`, `Component.processFocusEvent(java.awt.event.FocusEvent)`, `Component.processKeyEvent(java.awt.event.KeyEvent)`, `Component.processMouseEvent(java.awt.event.MouseEvent)`, `Component.processMouseMotionEvent(java.awt.event.MouseEvent)`, `Component.processInputMethodEvent(java.awt.event.InputMethodEvent)`, `Component.processHierarchyEvent(java.awt.event.HierarchyEvent)`, `Component.processMouseWheelEvent(java.awt.event.MouseWheelEvent)`
	processFocusEvent	`protected void` processFocusEvent(FocusEvent e) Processes focus events occurring on this component by dispatching them to any registered `FocusListener` objects. protected void processFocusEvent(FocusEvent e) Description copied from class: `Component` Processes focus events occurring on this component by dispatching them to any registered `FocusListener` objects. This method is not called unless focus events are enabled for this component. Focus events are enabled when one of the following occurs: A `FocusListener` object is registered via `addFocusListener`. Focus events are enabled via `enableEvents`. If focus events are enabled for a `Component`, the current `KeyboardFocusManager` determines whether or not a focus event should be dispatched to registered `FocusListener` objects. If the events are to be dispatched, the `KeyboardFocusManager` calls the `Component`'s `dispatchEvent` method, which results in a call to the `Component`'s `processFocusEvent` method. If focus events are enabled for a `Component`, calling the `Component`'s `dispatchEvent` method with a `FocusEvent` as the argument will result in a call to the `Component`'s `processFocusEvent` method regardless of the current `KeyboardFocusManager`. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the focus event Since: JDK1.1 See Also: `FocusEvent`, `FocusListener`, `KeyboardFocusManager`, `Component.addFocusListener(java.awt.event.FocusListener)`, `Component.enableEvents(long)`, `Component.dispatchEvent(java.awt.AWTEvent)`
	processHierarchyBoundsEvent	`protected void` processHierarchyBoundsEvent(HierarchyEvent e) Processes hierarchy bounds events occurring on this component by dispatching them to any registered `HierarchyBoundsListener` objects. protected void processHierarchyBoundsEvent(HierarchyEvent e) Description copied from class: `Component` Processes hierarchy bounds events occurring on this component by dispatching them to any registered `HierarchyBoundsListener` objects. This method is not called unless hierarchy bounds events are enabled for this component. Hierarchy bounds events are enabled when one of the following occurs: An `HierarchyBoundsListener` object is registered via `addHierarchyBoundsListener`. Hierarchy bounds events are enabled via `enableEvents`. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the hierarchy event Since: 1.3 See Also: `HierarchyEvent`, `HierarchyBoundsListener`, `Component.addHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`, `Component.enableEvents(long)`
	processHierarchyEvent	`protected void` processHierarchyEvent(HierarchyEvent e) Processes hierarchy events occurring on this component by dispatching them to any registered `HierarchyListener` objects. protected void processHierarchyEvent(HierarchyEvent e) Description copied from class: `Component` Processes hierarchy events occurring on this component by dispatching them to any registered `HierarchyListener` objects. This method is not called unless hierarchy events are enabled for this component. Hierarchy events are enabled when one of the following occurs: An `HierarchyListener` object is registered via `addHierarchyListener`. Hierarchy events are enabled via `enableEvents`. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the hierarchy event Since: 1.3 See Also: `HierarchyEvent`, `HierarchyListener`, `Component.addHierarchyListener(java.awt.event.HierarchyListener)`, `Component.enableEvents(long)`
	processInputMethodEvent	`protected void` processInputMethodEvent(InputMethodEvent e) Processes input method events occurring on this component by dispatching them to any registered `InputMethodListener` objects. protected void processInputMethodEvent(InputMethodEvent e) Description copied from class: `Component` Processes input method events occurring on this component by dispatching them to any registered `InputMethodListener` objects. This method is not called unless input method events are enabled for this component. Input method events are enabled when one of the following occurs: An `InputMethodListener` object is registered via `addInputMethodListener`. Input method events are enabled via `enableEvents`. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the input method event Since: 1.2 See Also: `InputMethodEvent`, `InputMethodListener`, `Component.addInputMethodListener(java.awt.event.InputMethodListener)`, `Component.enableEvents(long)`
	processKeyEvent	`protected void` processKeyEvent(KeyEvent e) Processes key events occurring on this component by dispatching them to any registered `KeyListener` objects. protected void processKeyEvent(KeyEvent e) Description copied from class: `Component` Processes key events occurring on this component by dispatching them to any registered `KeyListener` objects. This method is not called unless key events are enabled for this component. Key events are enabled when one of the following occurs: A `KeyListener` object is registered via `addKeyListener`. Key events are enabled via `enableEvents`. If key events are enabled for a `Component`, the current `KeyboardFocusManager` determines whether or not a key event should be dispatched to registered `KeyListener` objects. The `DefaultKeyboardFocusManager` will not dispatch key events to a `Component` that is not the focus owner or is not showing. As of J2SE 1.4, `KeyEvent`s are redirected to the focus owner. Please see the Focus Specification for further information. Calling a `Component`'s `dispatchEvent` method with a `KeyEvent` as the argument will result in a call to the `Component`'s `processKeyEvent` method regardless of the current `KeyboardFocusManager` as long as the component is showing, focused, and enabled, and key events are enabled on it. If the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the key event Since: JDK1.1 See Also: `KeyEvent`, `KeyListener`, `KeyboardFocusManager`, `DefaultKeyboardFocusManager`, `Component.processEvent(java.awt.AWTEvent)`, `Component.dispatchEvent(java.awt.AWTEvent)`, `Component.addKeyListener(java.awt.event.KeyListener)`, `Component.enableEvents(long)`, `Component.isShowing()`
	processMouseEvent	`protected void` processMouseEvent(MouseEvent e) Processes mouse events occurring on this component by dispatching them to any registered `MouseListener` objects. protected void processMouseEvent(MouseEvent e) Description copied from class: `Component` Processes mouse events occurring on this component by dispatching them to any registered `MouseListener` objects. This method is not called unless mouse events are enabled for this component. Mouse events are enabled when one of the following occurs: A `MouseListener` object is registered via `addMouseListener`. Mouse events are enabled via `enableEvents`. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the mouse event Since: JDK1.1 See Also: `MouseEvent`, `MouseListener`, `Component.addMouseListener(java.awt.event.MouseListener)`, `Component.enableEvents(long)`
	processMouseMotionEvent	`protected void` processMouseMotionEvent(MouseEvent e) Processes mouse motion events occurring on this component by dispatching them to any registered `MouseMotionListener` objects. protected void processMouseMotionEvent(MouseEvent e) Description copied from class: `Component` Processes mouse motion events occurring on this component by dispatching them to any registered `MouseMotionListener` objects. This method is not called unless mouse motion events are enabled for this component. Mouse motion events are enabled when one of the following occurs: A `MouseMotionListener` object is registered via `addMouseMotionListener`. Mouse motion events are enabled via `enableEvents`. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the mouse motion event Since: JDK1.1 See Also: `MouseEvent`, `MouseMotionListener`, `Component.addMouseMotionListener(java.awt.event.MouseMotionListener)`, `Component.enableEvents(long)`
	processMouseWheelEvent	`protected void` processMouseWheelEvent(MouseWheelEvent e) Processes mouse wheel events occurring on this component by dispatching them to any registered `MouseWheelListener` objects. protected void processMouseWheelEvent(MouseWheelEvent e) Description copied from class: `Component` Processes mouse wheel events occurring on this component by dispatching them to any registered `MouseWheelListener` objects. This method is not called unless mouse wheel events are enabled for this component. Mouse wheel events are enabled when one of the following occurs: A `MouseWheelListener` object is registered via `addMouseWheelListener`. Mouse wheel events are enabled via `enableEvents`. For information on how mouse wheel events are dispatched, see the class description for `MouseWheelEvent`. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the mouse wheel event Since: 1.4 See Also: `MouseWheelEvent`, `MouseWheelListener`, `Component.addMouseWheelListener(java.awt.event.MouseWheelListener)`, `Component.enableEvents(long)`

Event Registration Methods
Modifier and Type	Method and Description
	addComponentListener	`void` addComponentListener(ComponentListener l) Adds the specified component listener to receive component events from this component. public void addComponentListener(ComponentListener l) Description copied from class: `Component` Adds the specified component listener to receive component events from this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the component listener Since: JDK1.1 See Also: `ComponentEvent`, `ComponentListener`, `Component.removeComponentListener(java.awt.event.ComponentListener)`, `Component.getComponentListeners()`
	addContainerListener	`void` addContainerListener(ContainerListener l) Adds the specified container listener to receive container events from this container. public void addContainerListener(ContainerListener l) Adds the specified container listener to receive container events from this container. If l is null, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the container listener See Also: `removeContainerListener(java.awt.event.ContainerListener)`, `getContainerListeners()`
	addFocusListener	`void` addFocusListener(FocusListener l) Adds the specified focus listener to receive focus events from this component when this component gains input focus. public void addFocusListener(FocusListener l) Description copied from class: `Component` Adds the specified focus listener to receive focus events from this component when this component gains input focus. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the focus listener Since: JDK1.1 See Also: `FocusEvent`, `FocusListener`, `Component.removeFocusListener(java.awt.event.FocusListener)`, `Component.getFocusListeners()`
	addHierarchyBoundsListener	`void` addHierarchyBoundsListener(HierarchyBoundsListener l) Adds the specified hierarchy bounds listener to receive hierarchy bounds events from this component when the hierarchy to which this container belongs changes. public void addHierarchyBoundsListener(HierarchyBoundsListener l) Description copied from class: `Component` Adds the specified hierarchy bounds listener to receive hierarchy bounds events from this component when the hierarchy to which this container belongs changes. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the hierarchy bounds listener Since: 1.3 See Also: `HierarchyEvent`, `HierarchyBoundsListener`, `Component.removeHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`, `Component.getHierarchyBoundsListeners()`
	addHierarchyListener	`void` addHierarchyListener(HierarchyListener l) Adds the specified hierarchy listener to receive hierarchy changed events from this component when the hierarchy to which this container belongs changes. public void addHierarchyListener(HierarchyListener l) Description copied from class: `Component` Adds the specified hierarchy listener to receive hierarchy changed events from this component when the hierarchy to which this container belongs changes. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the hierarchy listener Since: 1.3 See Also: `HierarchyEvent`, `HierarchyListener`, `Component.removeHierarchyListener(java.awt.event.HierarchyListener)`, `Component.getHierarchyListeners()`
	addInputMethodListener	`void` addInputMethodListener(InputMethodListener l) Adds the specified input method listener to receive input method events from this component. public void addInputMethodListener(InputMethodListener l) Description copied from class: `Component` Adds the specified input method listener to receive input method events from this component. A component will only receive input method events from input methods if it also overrides `getInputMethodRequests` to return an `InputMethodRequests` instance. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the input method listener Since: 1.2 See Also: `InputMethodEvent`, `InputMethodListener`, `Component.removeInputMethodListener(java.awt.event.InputMethodListener)`, `Component.getInputMethodListeners()`, `Component.getInputMethodRequests()`
	addKeyListener	`void` addKeyListener(KeyListener l) Adds the specified key listener to receive key events from this component. public void addKeyListener(KeyListener l) Description copied from class: `Component` Adds the specified key listener to receive key events from this component. If l is null, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the key listener. Since: JDK1.1 See Also: `KeyEvent`, `KeyListener`, `Component.removeKeyListener(java.awt.event.KeyListener)`, `Component.getKeyListeners()`
	addMouseListener	`void` addMouseListener(MouseListener l) Adds the specified mouse listener to receive mouse events from this component. public void addMouseListener(MouseListener l) Description copied from class: `Component` Adds the specified mouse listener to receive mouse events from this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the mouse listener Since: JDK1.1 See Also: `MouseEvent`, `MouseListener`, `Component.removeMouseListener(java.awt.event.MouseListener)`, `Component.getMouseListeners()`
	addMouseMotionListener	`void` addMouseMotionListener(MouseMotionListener l) Adds the specified mouse motion listener to receive mouse motion events from this component. public void addMouseMotionListener(MouseMotionListener l) Description copied from class: `Component` Adds the specified mouse motion listener to receive mouse motion events from this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the mouse motion listener Since: JDK1.1 See Also: `MouseEvent`, `MouseMotionListener`, `Component.removeMouseMotionListener(java.awt.event.MouseMotionListener)`, `Component.getMouseMotionListeners()`
	addMouseWheelListener	`void` addMouseWheelListener(MouseWheelListener l) Adds the specified mouse wheel listener to receive mouse wheel events from this component. public void addMouseWheelListener(MouseWheelListener l) Description copied from class: `Component` Adds the specified mouse wheel listener to receive mouse wheel events from this component. Containers also receive mouse wheel events from sub-components. For information on how mouse wheel events are dispatched, see the class description for `MouseWheelEvent`. If l is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the mouse wheel listener Since: 1.4 See Also: `MouseWheelEvent`, `MouseWheelListener`, `Component.removeMouseWheelListener(java.awt.event.MouseWheelListener)`, `Component.getMouseWheelListeners()`
	addPropertyChangeListener	`void` addPropertyChangeListener(java.beans.PropertyChangeListener listener) Adds a PropertyChangeListener to the listener list. public void addPropertyChangeListener(java.beans.PropertyChangeListener listener) Adds a PropertyChangeListener to the listener list. The listener is registered for all bound properties of this class, including the following: this Container's font ("font") this Container's background color ("background") this Container's foreground color ("foreground") this Container's focusability ("focusable") this Container's focus traversal keys enabled state ("focusTraversalKeysEnabled") this Container's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys") this Container's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys") this Container's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys") this Container's Set of DOWN_CYCLE_TRAVERSAL_KEYS ("downCycleFocusTraversalKeys") this Container's focus traversal policy ("focusTraversalPolicy") this Container's focus-cycle-root state ("focusCycleRoot") Note that if this Container is inheriting a bound property, then no event will be fired in response to a change in the inherited property. If listener is null, no exception is thrown and no action is performed. Overrides: `addPropertyChangeListener` in class `Component` Parameters: `listener` - the PropertyChangeListener to be added See Also: `Component.removePropertyChangeListener(java.beans.PropertyChangeListener)`, `addPropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)`
	addPropertyChangeListener	`void` addPropertyChangeListener(java.lang.String propertyName, java.beans.PropertyChangeListener listener) Adds a PropertyChangeListener to the listener list for a specific property. public void addPropertyChangeListener(java.lang.String propertyName, java.beans.PropertyChangeListener listener) Adds a PropertyChangeListener to the listener list for a specific property. The specified property may be user-defined, or one of the following defaults: this Container's font ("font") this Container's background color ("background") this Container's foreground color ("foreground") this Container's focusability ("focusable") this Container's focus traversal keys enabled state ("focusTraversalKeysEnabled") this Container's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys") this Container's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys") this Container's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys") this Container's Set of DOWN_CYCLE_TRAVERSAL_KEYS ("downCycleFocusTraversalKeys") this Container's focus traversal policy ("focusTraversalPolicy") this Container's focus-cycle-root state ("focusCycleRoot") this Container's focus-traversal-policy-provider state("focusTraversalPolicyProvider") this Container's focus-traversal-policy-provider state("focusTraversalPolicyProvider") Note that if this Container is inheriting a bound property, then no event will be fired in response to a change in the inherited property. If listener is null, no exception is thrown and no action is performed. Overrides: `addPropertyChangeListener` in class `Component` Parameters: `propertyName` - one of the property names listed above `listener` - the PropertyChangeListener to be added See Also: `addPropertyChangeListener(java.beans.PropertyChangeListener)`, `Component.removePropertyChangeListener(java.beans.PropertyChangeListener)`
	getComponentListeners	`ComponentListener[]` getComponentListeners() Returns an array of all the component listeners registered on this component. public ComponentListener[] getComponentListeners() Description copied from class: `Component` Returns an array of all the component listeners registered on this component. Returns: all of this comonent's `ComponentListener`s or an empty array if no component listeners are currently registered Since: 1.4 See Also: `Component.addComponentListener(java.awt.event.ComponentListener)`, `Component.removeComponentListener(java.awt.event.ComponentListener)`
	getContainerListeners	`ContainerListener[]` getContainerListeners() Returns an array of all the container listeners registered on this container. public ContainerListener[] getContainerListeners() Returns an array of all the container listeners registered on this container. Returns: all of this container's `ContainerListener`s or an empty array if no container listeners are currently registered Since: 1.4 See Also: `addContainerListener(java.awt.event.ContainerListener)`, `removeContainerListener(java.awt.event.ContainerListener)`
	getFocusListeners	`FocusListener[]` getFocusListeners() Returns an array of all the focus listeners registered on this component. public FocusListener[] getFocusListeners() Description copied from class: `Component` Returns an array of all the focus listeners registered on this component. Returns: all of this component's `FocusListener`s or an empty array if no component listeners are currently registered Since: 1.4 See Also: `Component.addFocusListener(java.awt.event.FocusListener)`, `Component.removeFocusListener(java.awt.event.FocusListener)`
	getHierarchyBoundsListeners	`HierarchyBoundsListener[]` getHierarchyBoundsListeners() Returns an array of all the hierarchy bounds listeners registered on this component. public HierarchyBoundsListener[] getHierarchyBoundsListeners() Description copied from class: `Component` Returns an array of all the hierarchy bounds listeners registered on this component. Returns: all of this component's `HierarchyBoundsListener`s or an empty array if no hierarchy bounds listeners are currently registered Since: 1.4 See Also: `Component.addHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`, `Component.removeHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`
	getHierarchyListeners	`HierarchyListener[]` getHierarchyListeners() Returns an array of all the hierarchy listeners registered on this component. public HierarchyListener[] getHierarchyListeners() Description copied from class: `Component` Returns an array of all the hierarchy listeners registered on this component. Returns: all of this component's `HierarchyListener`s or an empty array if no hierarchy listeners are currently registered Since: 1.4 See Also: `Component.addHierarchyListener(java.awt.event.HierarchyListener)`, `Component.removeHierarchyListener(java.awt.event.HierarchyListener)`
	getInputMethodListeners	`InputMethodListener[]` getInputMethodListeners() Returns an array of all the input method listeners registered on this component. public InputMethodListener[] getInputMethodListeners() Description copied from class: `Component` Returns an array of all the input method listeners registered on this component. Returns: all of this component's `InputMethodListener`s or an empty array if no input method listeners are currently registered Since: 1.4 See Also: `Component.addInputMethodListener(java.awt.event.InputMethodListener)`, `Component.removeInputMethodListener(java.awt.event.InputMethodListener)`
	getKeyListeners	`KeyListener[]` getKeyListeners() Returns an array of all the key listeners registered on this component. public KeyListener[] getKeyListeners() Description copied from class: `Component` Returns an array of all the key listeners registered on this component. Returns: all of this component's `KeyListener`s or an empty array if no key listeners are currently registered Since: 1.4 See Also: `Component.addKeyListener(java.awt.event.KeyListener)`, `Component.removeKeyListener(java.awt.event.KeyListener)`
	getMouseListeners	`MouseListener[]` getMouseListeners() Returns an array of all the mouse listeners registered on this component. public MouseListener[] getMouseListeners() Description copied from class: `Component` Returns an array of all the mouse listeners registered on this component. Returns: all of this component's `MouseListener`s or an empty array if no mouse listeners are currently registered Since: 1.4 See Also: `Component.addMouseListener(java.awt.event.MouseListener)`, `Component.removeMouseListener(java.awt.event.MouseListener)`
	getMouseMotionListeners	`MouseMotionListener[]` getMouseMotionListeners() Returns an array of all the mouse motion listeners registered on this component. public MouseMotionListener[] getMouseMotionListeners() Description copied from class: `Component` Returns an array of all the mouse motion listeners registered on this component. Returns: all of this component's `MouseMotionListener`s or an empty array if no mouse motion listeners are currently registered Since: 1.4 See Also: `Component.addMouseMotionListener(java.awt.event.MouseMotionListener)`, `Component.removeMouseMotionListener(java.awt.event.MouseMotionListener)`
	getMouseWheelListeners	`MouseWheelListener[]` getMouseWheelListeners() Returns an array of all the mouse wheel listeners registered on this component. public MouseWheelListener[] getMouseWheelListeners() Description copied from class: `Component` Returns an array of all the mouse wheel listeners registered on this component. Returns: all of this component's `MouseWheelListener`s or an empty array if no mouse wheel listeners are currently registered Since: 1.4 See Also: `Component.addMouseWheelListener(java.awt.event.MouseWheelListener)`, `Component.removeMouseWheelListener(java.awt.event.MouseWheelListener)`
	getPropertyChangeListeners	`java.beans.PropertyChangeListener[]` getPropertyChangeListeners() Returns an array of all the property change listeners registered on this component. public java.beans.PropertyChangeListener[] getPropertyChangeListeners() Description copied from class: `Component` Returns an array of all the property change listeners registered on this component. Returns: all of this component's `PropertyChangeListener`s or an empty array if no property change listeners are currently registered Since: 1.4 See Also: `Component.addPropertyChangeListener(java.beans.PropertyChangeListener)`, `Component.removePropertyChangeListener(java.beans.PropertyChangeListener)`, `Component.getPropertyChangeListeners(java.lang.String)`, `PropertyChangeSupport.getPropertyChangeListeners()`
	getPropertyChangeListeners	`java.beans.PropertyChangeListener[]` getPropertyChangeListeners(java.lang.String propertyName) Returns an array of all the listeners which have been associated with the named property. public java.beans.PropertyChangeListener[] getPropertyChangeListeners(java.lang.String propertyName) Description copied from class: `Component` Returns an array of all the listeners which have been associated with the named property. Returns: all of the `PropertyChangeListener`s associated with the named property; if no such listeners have been added or if `propertyName` is `null`, an empty array is returned Since: 1.4 See Also: `Component.addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`, `Component.removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`, `Component.getPropertyChangeListeners()`
	removeComponentListener	`void` removeComponentListener(ComponentListener l) Removes the specified component listener so that it no longer receives component events from this component. public void removeComponentListener(ComponentListener l) Description copied from class: `Component` Removes the specified component listener so that it no longer receives component events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the component listener Since: JDK1.1 See Also: `ComponentEvent`, `ComponentListener`, `Component.addComponentListener(java.awt.event.ComponentListener)`, `Component.getComponentListeners()`
	removeContainerListener	`void` removeContainerListener(ContainerListener l) Removes the specified container listener so it no longer receives container events from this container. public void removeContainerListener(ContainerListener l) Removes the specified container listener so it no longer receives container events from this container. If l is null, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the container listener See Also: `addContainerListener(java.awt.event.ContainerListener)`, `getContainerListeners()`
	removeFocusListener	`void` removeFocusListener(FocusListener l) Removes the specified focus listener so that it no longer receives focus events from this component. public void removeFocusListener(FocusListener l) Description copied from class: `Component` Removes the specified focus listener so that it no longer receives focus events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the focus listener Since: JDK1.1 See Also: `FocusEvent`, `FocusListener`, `Component.addFocusListener(java.awt.event.FocusListener)`, `Component.getFocusListeners()`
	removeHierarchyBoundsListener	`void` removeHierarchyBoundsListener(HierarchyBoundsListener l) Removes the specified hierarchy bounds listener so that it no longer receives hierarchy bounds events from this component. public void removeHierarchyBoundsListener(HierarchyBoundsListener l) Description copied from class: `Component` Removes the specified hierarchy bounds listener so that it no longer receives hierarchy bounds events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the hierarchy bounds listener Since: 1.3 See Also: `HierarchyEvent`, `HierarchyBoundsListener`, `Component.addHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`, `Component.getHierarchyBoundsListeners()`
	removeHierarchyListener	`void` removeHierarchyListener(HierarchyListener l) Removes the specified hierarchy listener so that it no longer receives hierarchy changed events from this component. public void removeHierarchyListener(HierarchyListener l) Description copied from class: `Component` Removes the specified hierarchy listener so that it no longer receives hierarchy changed events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the hierarchy listener Since: 1.3 See Also: `HierarchyEvent`, `HierarchyListener`, `Component.addHierarchyListener(java.awt.event.HierarchyListener)`, `Component.getHierarchyListeners()`
	removeInputMethodListener	`void` removeInputMethodListener(InputMethodListener l) Removes the specified input method listener so that it no longer receives input method events from this component. public void removeInputMethodListener(InputMethodListener l) Description copied from class: `Component` Removes the specified input method listener so that it no longer receives input method events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the input method listener Since: 1.2 See Also: `InputMethodEvent`, `InputMethodListener`, `Component.addInputMethodListener(java.awt.event.InputMethodListener)`, `Component.getInputMethodListeners()`
	removeKeyListener	`void` removeKeyListener(KeyListener l) Removes the specified key listener so that it no longer receives key events from this component. public void removeKeyListener(KeyListener l) Description copied from class: `Component` Removes the specified key listener so that it no longer receives key events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the key listener Since: JDK1.1 See Also: `KeyEvent`, `KeyListener`, `Component.addKeyListener(java.awt.event.KeyListener)`, `Component.getKeyListeners()`
	removeMouseListener	`void` removeMouseListener(MouseListener l) Removes the specified mouse listener so that it no longer receives mouse events from this component. public void removeMouseListener(MouseListener l) Description copied from class: `Component` Removes the specified mouse listener so that it no longer receives mouse events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the mouse listener Since: JDK1.1 See Also: `MouseEvent`, `MouseListener`, `Component.addMouseListener(java.awt.event.MouseListener)`, `Component.getMouseListeners()`
	removeMouseMotionListener	`void` removeMouseMotionListener(MouseMotionListener l) Removes the specified mouse motion listener so that it no longer receives mouse motion events from this component. public void removeMouseMotionListener(MouseMotionListener l) Description copied from class: `Component` Removes the specified mouse motion listener so that it no longer receives mouse motion events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener `l` is `null`, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the mouse motion listener Since: JDK1.1 See Also: `MouseEvent`, `MouseMotionListener`, `Component.addMouseMotionListener(java.awt.event.MouseMotionListener)`, `Component.getMouseMotionListeners()`
	removeMouseWheelListener	`void` removeMouseWheelListener(MouseWheelListener l) Removes the specified mouse wheel listener so that it no longer receives mouse wheel events from this component. public void removeMouseWheelListener(MouseWheelListener l) Description copied from class: `Component` Removes the specified mouse wheel listener so that it no longer receives mouse wheel events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If l is null, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. Parameters: `l` - the mouse wheel listener. Since: 1.4 See Also: `MouseWheelEvent`, `MouseWheelListener`, `Component.addMouseWheelListener(java.awt.event.MouseWheelListener)`, `Component.getMouseWheelListeners()`
	removePropertyChangeListener	`void` removePropertyChangeListener(java.beans.PropertyChangeListener listener) Removes a PropertyChangeListener from the listener list. public void removePropertyChangeListener(java.beans.PropertyChangeListener listener) Description copied from class: `Component` Removes a PropertyChangeListener from the listener list. This method should be used to remove PropertyChangeListeners that were registered for all bound properties of this class. If listener is null, no exception is thrown and no action is performed. Parameters: `listener` - the PropertyChangeListener to be removed See Also: `Component.addPropertyChangeListener(java.beans.PropertyChangeListener)`, `Component.getPropertyChangeListeners()`, `Component.removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)`
	removePropertyChangeListener	`void` removePropertyChangeListener(java.lang.String propertyName, java.beans.PropertyChangeListener listener) Removes a `PropertyChangeListener` from the listener list for a specific property. public void removePropertyChangeListener(java.lang.String propertyName, java.beans.PropertyChangeListener listener) Description copied from class: `Component` Removes a `PropertyChangeListener` from the listener list for a specific property. This method should be used to remove `PropertyChangeListener`s that were registered for a specific bound property. If `propertyName` or `listener` is `null`, no exception is thrown and no action is taken. Parameters: `propertyName` - a valid property name `listener` - the PropertyChangeListener to be removed See Also: `Component.addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`, `Component.getPropertyChangeListeners(java.lang.String)`, `Component.removePropertyChangeListener(java.beans.PropertyChangeListener)`

Modifier and Type Method and Description

areFocusTraversalKeysSet

boolean areFocusTraversalKeysSet(int id)

Returns whether the Set of focus traversal keys for the given focus traversal operation has been explicitly defined for this Container.

getFocusCycleRootAncestor

Container getFocusCycleRootAncestor()

Returns the Container which is the focus cycle root of this Component's focus traversal cycle.

getFocusTraversalKeys

java.util.Set<AWTKeyStroke> getFocusTraversalKeys(int id)

Returns the Set of focus traversal keys for a given traversal operation for this Container.

getFocusTraversalKeysEnabled

boolean getFocusTraversalKeysEnabled()

Returns whether focus traversal keys are enabled for this Component.

getFocusTraversalPolicy

FocusTraversalPolicy getFocusTraversalPolicy()

Returns the focus traversal policy that will manage keyboard traversal of this Container's children, or null if this Container is not a focus cycle root.

gotFocus

boolean gotFocus(Event evt, java.lang.Object what)

Deprecated. As of JDK version 1.1, replaced by processFocusEvent(FocusEvent).

hasFocus

boolean hasFocus()

Returns true if this Component is the focus owner.

isFocusable

boolean isFocusable()

Returns whether this Component can be focused.

isFocusCycleRoot

boolean isFocusCycleRoot()

Returns whether this Container is the root of a focus traversal cycle.

isFocusCycleRoot

boolean isFocusCycleRoot(Container container)

Returns whether the specified Container is the focus cycle root of this Container's focus traversal cycle.

isFocusOwner

boolean isFocusOwner()

Returns true if this Component is the focus owner.

isFocusTraversable

boolean isFocusTraversable()

Deprecated. As of 1.4, replaced by isFocusable().

isFocusTraversalPolicyProvider

boolean isFocusTraversalPolicyProvider()

Returns whether this container provides focus traversal policy.

isFocusTraversalPolicySet

boolean isFocusTraversalPolicySet()

Returns whether the focus traversal policy has been explicitly set for this Container.

lostFocus

boolean lostFocus(Event evt, java.lang.Object what)

Deprecated. As of JDK version 1.1, replaced by processFocusEvent(FocusEvent).

nextFocus

void nextFocus()

Deprecated. As of JDK version 1.1, replaced by transferFocus().

requestFocus

void requestFocus()

Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window.

requestFocus

protected boolean requestFocus(boolean temporary)

Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window.

protected boolean requestFocus(boolean temporary)

Description copied from class: Component

Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window. This component must be displayable, focusable, visible and all of its ancestors (with the exception of the top-level Window) must be visible for the request to be granted. Every effort will be made to honor the request; however, in some cases it may be impossible to do so. Developers must never assume that this component is the focus owner until this component receives a FOCUS_GAINED event. If this request is denied because this component's top-level window cannot become the focused window, the request will be remembered and will be granted when the window is later focused by the user.

This method returns a boolean value. If false is returned, the request is guaranteed to fail. If true is returned, the request will succeed unless it is vetoed, or an extraordinary event, such as disposal of the component's peer, occurs before the request can be granted by the native windowing system. Again, while a return value of true indicates that the request is likely to succeed, developers must never assume that this component is the focus owner until this component receives a FOCUS_GAINED event.

This method cannot be used to set the focus owner to no component at all. Use KeyboardFocusManager.clearGlobalFocusOwner instead.

Because the focus behavior of this method is platform-dependent, developers are strongly encouraged to use requestFocusInWindow when possible.

Every effort will be made to ensure that FocusEvents generated as a result of this request will have the specified temporary value. However, because specifying an arbitrary temporary state may not be implementable on all native windowing systems, correct behavior for this method can be guaranteed only for lightweight Components. This method is not intended for general use, but exists instead as a hook for lightweight component libraries, such as Swing.

Note: Not all focus transfers result from invoking this method. As such, a component may receive focus without this or any of the other requestFocus methods of Component being invoked.

Parameters:: temporary - true if the focus change is temporary, such as when the window loses the focus; for more information on temporary focus changes see the Focus Specification
Returns:: false if the focus change request is guaranteed to fail; true if it is likely to succeed
Since:: 1.4
See Also:: FocusEvent, Component.addFocusListener(java.awt.event.FocusListener), Component.isFocusable(), Component.isDisplayable(), KeyboardFocusManager.clearGlobalFocusOwner()

requestFocusInWindow

boolean requestFocusInWindow()

Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window.

public boolean requestFocusInWindow()

Description copied from class: Component

Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window. This component must be displayable, focusable, visible and all of its ancestors (with the exception of the top-level Window) must be visible for the request to be granted. Every effort will be made to honor the request; however, in some cases it may be impossible to do so. Developers must never assume that this Component is the focus owner until this Component receives a FOCUS_GAINED event.

This method returns a boolean value. If false is returned, the request is guaranteed to fail. If true is returned, the request will succeed unless it is vetoed, or an extraordinary event, such as disposal of the Component's peer, occurs before the request can be granted by the native windowing system. Again, while a return value of true indicates that the request is likely to succeed, developers must never assume that this Component is the focus owner until this Component receives a FOCUS_GAINED event.

This method cannot be used to set the focus owner to no Component at all. Use KeyboardFocusManager.clearGlobalFocusOwner() instead.

The focus behavior of this method can be implemented uniformly across platforms, and thus developers are strongly encouraged to use this method over requestFocus when possible. Code which relies on requestFocus may exhibit different focus behavior on different platforms.

Note: Not all focus transfers result from invoking this method. As such, a component may receive focus without this or any of the other requestFocus methods of Component being invoked.

Returns:: false if the focus change request is guaranteed to fail; true if it is likely to succeed
Since:: 1.4
See Also:: Component.requestFocus(), FocusEvent, Component.addFocusListener(java.awt.event.FocusListener), Component.isFocusable(), Component.isDisplayable(), KeyboardFocusManager.clearGlobalFocusOwner()

requestFocusInWindow

protected boolean requestFocusInWindow(boolean temporary)

Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window.

protected boolean requestFocusInWindow(boolean temporary)

Description copied from class: Component

Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window. This component must be displayable, focusable, visible and all of its ancestors (with the exception of the top-level Window) must be visible for the request to be granted. Every effort will be made to honor the request; however, in some cases it may be impossible to do so. Developers must never assume that this component is the focus owner until this component receives a FOCUS_GAINED event.

This method cannot be used to set the focus owner to no component at all. Use KeyboardFocusManager.clearGlobalFocusOwner instead.

Every effort will be made to ensure that FocusEvents generated as a result of this request will have the specified temporary value. However, because specifying an arbitrary temporary state may not be implementable on all native windowing systems, correct behavior for this method can be guaranteed only for lightweight components. This method is not intended for general use, but exists instead as a hook for lightweight component libraries, such as Swing.

Note: Not all focus transfers result from invoking this method. As such, a component may receive focus without this or any of the other requestFocus methods of Component being invoked.

Parameters:: temporary - true if the focus change is temporary, such as when the window loses the focus; for more information on temporary focus changes see the Focus Specification
Returns:: false if the focus change request is guaranteed to fail; true if it is likely to succeed
Since:: 1.4
See Also:: Component.requestFocus(), FocusEvent, Component.addFocusListener(java.awt.event.FocusListener), Component.isFocusable(), Component.isDisplayable(), KeyboardFocusManager.clearGlobalFocusOwner()

setFocusable

void setFocusable(boolean focusable)

Sets the focusable state of this Component to the specified value.

setFocusCycleRoot

void setFocusCycleRoot(boolean focusCycleRoot)

Sets whether this Container is the root of a focus traversal cycle.

setFocusTraversalKeys

void setFocusTraversalKeys(int id, java.util.Set<? extends AWTKeyStroke> keystrokes)

Sets the focus traversal keys for a given traversal operation for this Container.

public void setFocusTraversalKeys(int id, java.util.Set<? extends AWTKeyStroke> keystrokes)

Sets the focus traversal keys for a given traversal operation for this Container.

The default values for a Container's focus traversal keys are implementation-dependent. Sun recommends that all implementations for a particular native platform use the same default values. The recommendations for Windows and Unix are listed below. These recommendations are used in the Sun AWT implementations.

Identifier	Meaning	Default
KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS	Normal forward keyboard traversal	TAB on KEY_PRESSED, CTRL-TAB on KEY_PRESSED
KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS	Normal reverse keyboard traversal	SHIFT-TAB on KEY_PRESSED, CTRL-SHIFT-TAB on KEY_PRESSED
KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS	Go up one focus traversal cycle	none
KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS		Go down one focus traversal cycle	none

To disable a traversal key, use an empty Set; Collections.EMPTY_SET is recommended.

Using the AWTKeyStroke API, client code can specify on which of two specific KeyEvents, KEY_PRESSED or KEY_RELEASED, the focus traversal operation will occur. Regardless of which KeyEvent is specified, however, all KeyEvents related to the focus traversal key, including the associated KEY_TYPED event, will be consumed, and will not be dispatched to any Container. It is a runtime error to specify a KEY_TYPED event as mapping to a focus traversal operation, or to map the same event to multiple default focus traversal operations.

If a value of null is specified for the Set, this Container inherits the Set from its parent. If all ancestors of this Container have null specified for the Set, then the current KeyboardFocusManager's default Set is used.

Overrides:: setFocusTraversalKeys in class Component
Parameters:: id - one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS; keystrokes - the Set of AWTKeyStroke for the specified operation
Throws:: java.lang.IllegalArgumentException - if id is not one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS, or if keystrokes contains null, or if any Object in keystrokes is not an AWTKeyStroke, or if any keystroke represents a KEY_TYPED event, or if any keystroke already maps to another focus traversal operation for this Container
Since:: 1.4
See Also:: getFocusTraversalKeys(int), KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS

setFocusTraversalKeysEnabled

void setFocusTraversalKeysEnabled(boolean focusTraversalKeysEnabled)

Sets whether focus traversal keys are enabled for this Component.

setFocusTraversalPolicy

void setFocusTraversalPolicy(FocusTraversalPolicy policy)

Sets the focus traversal policy that will manage keyboard traversal of this Container's children, if this Container is a focus cycle root.

setFocusTraversalPolicyProvider

void setFocusTraversalPolicyProvider(boolean provider)

Sets whether this container will be used to provide focus traversal policy.

transferFocus

void transferFocus()

Transfers the focus to the next component, as though this Component were the focus owner.

transferFocusBackward

void transferFocusBackward()

Transfers the focus to the previous component, as though this Component were the focus owner.

transferFocusDownCycle

void transferFocusDownCycle()

Transfers the focus down one focus traversal cycle.

transferFocusUpCycle

void transferFocusUpCycle()

Transfers the focus up one focus traversal cycle.

Graphics Methods
Modifier and Type	Method and Description
	getFontMetrics	`FontMetrics` getFontMetrics(Font font) Gets the font metrics for the specified font. public FontMetrics getFontMetrics(Font font) Description copied from class: `Component` Gets the font metrics for the specified font. Warning: Since Font metrics are affected by the `FontRenderContext` and this method does not provide one, it can return only metrics for the default render context which may not match that used when rendering on the Component if `Graphics2D` functionality is being used. Instead metrics can be obtained at rendering time by calling `Graphics.getFontMetrics()` or text measurement APIs on the `Font` class. Parameters: `font` - the font for which font metrics is to be obtained Returns: the font metrics for `font` Since: JDK1.0 See Also: `Component.getFont()`, `Component.getPeer()`, `ComponentPeer.getFontMetrics(Font)`, `Toolkit.getFontMetrics(Font)`
	getGraphics	`Graphics` getGraphics() Creates a graphics context for this component. public Graphics getGraphics() Description copied from class: `Component` Creates a graphics context for this component. This method will return `null` if this component is currently not displayable. Returns: a graphics context for this component, or `null` if it has none Since: JDK1.0 See Also: `Component.paint(java.awt.Graphics)`
	getGraphicsConfiguration	`GraphicsConfiguration` getGraphicsConfiguration() Gets the `GraphicsConfiguration` associated with this `Component`. public GraphicsConfiguration getGraphicsConfiguration() Description copied from class: `Component` Gets the `GraphicsConfiguration` associated with this `Component`. If the `Component` has not been assigned a specific `GraphicsConfiguration`, the `GraphicsConfiguration` of the `Component` object's top-level container is returned. If the `Component` has been created, but not yet added to a `Container`, this method returns `null`. Returns: the `GraphicsConfiguration` used by this `Component` or `null` Since: 1.3
	getLocationOnScreen	`Point` getLocationOnScreen() Gets the location of this component in the form of a point specifying the component's top-left corner in the screen's coordinate space. public Point getLocationOnScreen() Description copied from class: `Component` Gets the location of this component in the form of a point specifying the component's top-left corner in the screen's coordinate space. Returns: an instance of `Point` representing the top-left corner of the component's bounds in the coordinate space of the screen Throws: `IllegalComponentStateException` - if the component is not showing on the screen See Also: `Component.setLocation(int, int)`, `Component.getLocation()`
	getMousePosition	`Point` getMousePosition() Returns the position of the mouse pointer in this `Component`'s coordinate space if the `Component` is directly under the mouse pointer, otherwise returns `null`. public Point getMousePosition() throws HeadlessException Description copied from class: `Component` Returns the position of the mouse pointer in this `Component`'s coordinate space if the `Component` is directly under the mouse pointer, otherwise returns `null`. If the `Component` is not showing on the screen, this method returns `null` even if the mouse pointer is above the area where the `Component` would be displayed. If the `Component` is partially or fully obscured by other `Component`s or native windows, this method returns a non-null value only if the mouse pointer is located above the unobscured part of the `Component`. For `Container`s it returns a non-null value if the mouse is above the `Container` itself or above any of its descendants. Use `getMousePosition(boolean)` if you need to exclude children. Sometimes the exact mouse coordinates are not important, and the only thing that matters is whether a specific `Component` is under the mouse pointer. If the return value of this method is `null`, mouse pointer is not directly above the `Component`. Returns: mouse coordinates relative to this `Component`, or null Throws: `HeadlessException` - if GraphicsEnvironment.isHeadless() returns true Since: 1.5 See Also: `Component.isShowing()`, `getMousePosition(boolean)`
	getToolkit	`Toolkit` getToolkit() Gets the toolkit of this component. public Toolkit getToolkit() Description copied from class: `Component` Gets the toolkit of this component. Note that the frame that contains a component controls which toolkit is used by that component. Therefore if the component is moved from one frame to another, the toolkit it uses may change. Returns: the toolkit of this component Since: JDK1.0

Hierarchy Methods
Modifier and Type	Method and Description
	add	`Component` add(Component comp) Appends the specified component to the end of this container. public Component add(Component comp) Appends the specified component to the end of this container. This is a convenience method for `addImpl(java.awt.Component, java.lang.Object, int)`. This method changes layout-related information, and therefore, invalidates the component hierarchy. If the container has already been displayed, the hierarchy must be validated thereafter in order to display the added component. Parameters: `comp` - the component to be added Returns: the component argument Throws: `java.lang.NullPointerException` - if `comp` is `null` See Also: `addImpl(java.awt.Component, java.lang.Object, int)`, `invalidate()`, `validate()`, `JComponent.revalidate()`
	add	`Component` add(Component comp, int index) Adds the specified component to this container at the given position. public Component add(Component comp, int index) Adds the specified component to this container at the given position. This is a convenience method for `addImpl(java.awt.Component, java.lang.Object, int)`. This method changes layout-related information, and therefore, invalidates the component hierarchy. If the container has already been displayed, the hierarchy must be validated thereafter in order to display the added component. Parameters: `comp` - the component to be added `index` - the position at which to insert the component, or `-1` to append the component to the end Returns: the component `comp` Throws: `java.lang.NullPointerException` - if `comp` is `null` `java.lang.IllegalArgumentException` - if `index` is invalid (see `addImpl(java.awt.Component, java.lang.Object, int)` for details) See Also: `addImpl(java.awt.Component, java.lang.Object, int)`, `remove(int)`, `invalidate()`, `validate()`, `JComponent.revalidate()`
	add	`void` add(Component comp, java.lang.Object constraints) Adds the specified component to the end of this container. public void add(Component comp, java.lang.Object constraints) Adds the specified component to the end of this container. Also notifies the layout manager to add the component to this container's layout using the specified constraints object. This is a convenience method for `addImpl(java.awt.Component, java.lang.Object, int)`. This method changes layout-related information, and therefore, invalidates the component hierarchy. If the container has already been displayed, the hierarchy must be validated thereafter in order to display the added component. Parameters: `comp` - the component to be added `constraints` - an object expressing layout contraints for this component Throws: `java.lang.NullPointerException` - if `comp` is `null` Since: JDK1.1 See Also: `addImpl(java.awt.Component, java.lang.Object, int)`, `invalidate()`, `validate()`, `JComponent.revalidate()`, `LayoutManager`
	add	`void` add(Component comp, java.lang.Object constraints, int index) Adds the specified component to this container with the specified constraints at the specified index. public void add(Component comp, java.lang.Object constraints, int index) Adds the specified component to this container with the specified constraints at the specified index. Also notifies the layout manager to add the component to the this container's layout using the specified constraints object. This is a convenience method for `addImpl(java.awt.Component, java.lang.Object, int)`. This method changes layout-related information, and therefore, invalidates the component hierarchy. If the container has already been displayed, the hierarchy must be validated thereafter in order to display the added component. Parameters: `comp` - the component to be added `constraints` - an object expressing layout contraints for this `index` - the position in the container's list at which to insert the component; `-1` means insert at the end component Throws: `java.lang.NullPointerException` - if `comp` is `null` `java.lang.IllegalArgumentException` - if `index` is invalid (see `addImpl(java.awt.Component, java.lang.Object, int)` for details) See Also: `addImpl(java.awt.Component, java.lang.Object, int)`, `invalidate()`, `validate()`, `JComponent.revalidate()`, `remove(int)`, `LayoutManager`
	add	`Component` add(java.lang.String name, Component comp) Adds the specified component to this container. public Component add(java.lang.String name, Component comp) Adds the specified component to this container. This is a convenience method for `addImpl(java.awt.Component, java.lang.Object, int)`. This method is obsolete as of 1.1. Please use the method `add(Component, Object)` instead. This method changes layout-related information, and therefore, invalidates the component hierarchy. If the container has already been displayed, the hierarchy must be validated thereafter in order to display the added component. Throws: `java.lang.NullPointerException` - if `comp` is `null` See Also: `add(Component, Object)`, `invalidate()`
	addImpl	`protected void` addImpl(Component comp, java.lang.Object constraints, int index) Adds the specified component to this container at the specified index. protected void addImpl(Component comp, java.lang.Object constraints, int index) Adds the specified component to this container at the specified index. This method also notifies the layout manager to add the component to this container's layout using the specified constraints object via the `addLayoutComponent` method. The constraints are defined by the particular layout manager being used. For example, the `BorderLayout` class defines five constraints: `BorderLayout.NORTH`, `BorderLayout.SOUTH`, `BorderLayout.EAST`, `BorderLayout.WEST`, and `BorderLayout.CENTER`. The `GridBagLayout` class requires a `GridBagConstraints` object. Failure to pass the correct type of constraints object results in an `IllegalArgumentException`. If the current layout manager implements `LayoutManager2`, then `LayoutManager2.addLayoutComponent(Component,Object)` is invoked on it. If the current layout manager does not implement `LayoutManager2`, and constraints is a `String`, then `LayoutManager.addLayoutComponent(String,Component)` is invoked on it. If the component is not an ancestor of this container and has a non-null parent, it is removed from its current parent before it is added to this container. This is the method to override if a program needs to track every add request to a container as all other add methods defer to this one. An overriding method should usually include a call to the superclass's version of the method: `super.addImpl(comp, constraints, index)` This method changes layout-related information, and therefore, invalidates the component hierarchy. If the container has already been displayed, the hierarchy must be validated thereafter in order to display the added component. Parameters: `comp` - the component to be added `constraints` - an object expressing layout constraints for this component `index` - the position in the container's list at which to insert the component, where `-1` means append to the end Throws: `java.lang.IllegalArgumentException` - if `index` is invalid; if `comp` is a child of this container, the valid range is `[-1, getComponentCount()-1]`; if component is not a child of this container, the valid range is `[-1, getComponentCount()]` `java.lang.IllegalArgumentException` - if `comp` is an ancestor of this container `java.lang.IllegalArgumentException` - if adding a window to a container `java.lang.NullPointerException` - if `comp` is `null` Since: JDK1.1 See Also: `add(Component)`, `add(Component, int)`, `add(Component, java.lang.Object)`, `invalidate()`, `LayoutManager`, `LayoutManager2`
	countComponents	`int` countComponents() Deprecated. As of JDK version 1.1, replaced by getComponentCount(). @Deprecated public int countComponents() Deprecated. As of JDK version 1.1, replaced by getComponentCount().
	getComponent	`Component` getComponent(int n) Gets the nth component in this container. public Component getComponent(int n) Gets the nth component in this container. Note: This method should be called under AWT tree lock. Parameters: `n` - the index of the component to get. Returns: the n^th component in this container. Throws: `java.lang.ArrayIndexOutOfBoundsException` - if the n^th value does not exist. See Also: `Component.getTreeLock()`
	getComponentCount	`int` getComponentCount() Gets the number of components in this panel. public int getComponentCount() Gets the number of components in this panel. Note: This method should be called under AWT tree lock. Returns: the number of components in this panel. Since: JDK1.1 See Also: `getComponent(int)`, `Component.getTreeLock()`
	getComponents	`Component[]` getComponents() Gets all the components in this container. public Component[] getComponents() Gets all the components in this container. Note: This method should be called under AWT tree lock. Returns: an array of all the components in this container. See Also: `Component.getTreeLock()`
	getComponentZOrder	`int` getComponentZOrder(Component comp) Returns the z-order index of the component inside the container. public int getComponentZOrder(Component comp) Returns the z-order index of the component inside the container. The higher a component is in the z-order hierarchy, the lower its index. The component with the lowest z-order index is painted last, above all other child components. Parameters: `comp` - the component being queried Returns: the z-order index of the component; otherwise returns -1 if the component is `null` or doesn't belong to the container Since: 1.5 See Also: `setComponentZOrder(java.awt.Component, int)`
	isAncestorOf	`boolean` isAncestorOf(Component c) Checks if the component is contained in the component hierarchy of this container. public boolean isAncestorOf(Component c) Checks if the component is contained in the component hierarchy of this container. Parameters: `c` - the component Returns: `true` if it is an ancestor; `false` otherwise. Since: JDK1.1
	remove	`void` remove(Component comp) Removes the specified component from this container. public void remove(Component comp) Removes the specified component from this container. This method also notifies the layout manager to remove the component from this container's layout via the `removeLayoutComponent` method. This method changes layout-related information, and therefore, invalidates the component hierarchy. If the container has already been displayed, the hierarchy must be validated thereafter in order to reflect the changes. Parameters: `comp` - the component to be removed Throws: `java.lang.NullPointerException` - if `comp` is `null` See Also: `add(java.awt.Component)`, `invalidate()`, `validate()`, `remove(int)`
	remove	`void` remove(int index) Removes the component, specified by `index`, from this container. public void remove(int index) Removes the component, specified by `index`, from this container. This method also notifies the layout manager to remove the component from this container's layout via the `removeLayoutComponent` method. This method changes layout-related information, and therefore, invalidates the component hierarchy. If the container has already been displayed, the hierarchy must be validated thereafter in order to reflect the changes. Parameters: `index` - the index of the component to be removed Throws: `java.lang.ArrayIndexOutOfBoundsException` - if `index` is not in range `[0, getComponentCount()-1]` Since: JDK1.1 See Also: `add(java.awt.Component)`, `invalidate()`, `validate()`, `getComponentCount()`
	removeAll	`void` removeAll() Removes all the components from this container. public void removeAll() Removes all the components from this container. This method also notifies the layout manager to remove the components from this container's layout via the `removeLayoutComponent` method. This method changes layout-related information, and therefore, invalidates the component hierarchy. If the container has already been displayed, the hierarchy must be validated thereafter in order to reflect the changes. See Also: `add(java.awt.Component)`, `remove(int)`, `invalidate()`
	setComponentZOrder	`void` setComponentZOrder(Component comp, int index) Moves the specified component to the specified z-order index in the container. public void setComponentZOrder(Component comp, int index) Moves the specified component to the specified z-order index in the container. The z-order determines the order that components are painted; the component with the highest z-order paints first and the component with the lowest z-order paints last. Where components overlap, the component with the lower z-order paints over the component with the higher z-order. If the component is a child of some other container, it is removed from that container before being added to this container. The important difference between this method and `java.awt.Container.add(Component, int)` is that this method doesn't call `removeNotify` on the component while removing it from its previous container unless necessary and when allowed by the underlying native windowing system. This way, if the component has the keyboard focus, it maintains the focus when moved to the new position. This property is guaranteed to apply only to lightweight non-`Container` components. This method changes layout-related information, and therefore, invalidates the component hierarchy. Note: Not all platforms support changing the z-order of heavyweight components from one container into another without the call to `removeNotify`. There is no way to detect whether a platform supports this, so developers shouldn't make any assumptions. Parameters: `comp` - the component to be moved `index` - the position in the container's list to insert the component, where `getComponentCount()` appends to the end Throws: `java.lang.NullPointerException` - if `comp` is `null` `java.lang.IllegalArgumentException` - if `comp` is one of the container's parents `java.lang.IllegalArgumentException` - if `index` is not in the range `[0, getComponentCount()]` for moving between containers, or not in the range `[0, getComponentCount()-1]` for moving inside a container `java.lang.IllegalArgumentException` - if adding a container to itself `java.lang.IllegalArgumentException` - if adding a `Window` to a container Since: 1.5 See Also: `getComponentZOrder(java.awt.Component)`, `invalidate()`

Image Methods
Modifier and Type	Method and Description
	checkImage	`int` checkImage(Image image, java.awt.image.ImageObserver observer) Returns the status of the construction of a screen representation of the specified image. public int checkImage(Image image, java.awt.image.ImageObserver observer) Description copied from class: `Component` Returns the status of the construction of a screen representation of the specified image. This method does not cause the image to begin loading. An application must use the `prepareImage` method to force the loading of an image. Information on the flags returned by this method can be found with the discussion of the `ImageObserver` interface. Parameters: `image` - the `Image` object whose status is being checked `observer` - the `ImageObserver` object to be notified as the image is being prepared Returns: the bitwise inclusive OR of `ImageObserver` flags indicating what information about the image is currently available Since: JDK1.0 See Also: `Component.prepareImage(Image, int, int, java.awt.image.ImageObserver)`, `Toolkit.checkImage(Image, int, int, java.awt.image.ImageObserver)`, `ImageObserver`
	checkImage	`int` checkImage(Image image, int width, int height, java.awt.image.ImageObserver observer) Returns the status of the construction of a screen representation of the specified image. public int checkImage(Image image, int width, int height, java.awt.image.ImageObserver observer) Description copied from class: `Component` Returns the status of the construction of a screen representation of the specified image. This method does not cause the image to begin loading. An application must use the `prepareImage` method to force the loading of an image. The `checkImage` method of `Component` calls its peer's `checkImage` method to calculate the flags. If this component does not yet have a peer, the component's toolkit's `checkImage` method is called instead. Information on the flags returned by this method can be found with the discussion of the `ImageObserver` interface. Parameters: `image` - the `Image` object whose status is being checked `width` - the width of the scaled version whose status is to be checked `height` - the height of the scaled version whose status is to be checked `observer` - the `ImageObserver` object to be notified as the image is being prepared Returns: the bitwise inclusive OR of `ImageObserver` flags indicating what information about the image is currently available Since: JDK1.0 See Also: `Component.prepareImage(Image, int, int, java.awt.image.ImageObserver)`, `Toolkit.checkImage(Image, int, int, java.awt.image.ImageObserver)`, `ImageObserver`
	createImage	`Image` createImage(java.awt.image.ImageProducer producer) Creates an image from the specified image producer. public Image createImage(java.awt.image.ImageProducer producer) Description copied from class: `Component` Creates an image from the specified image producer. Parameters: `producer` - the image producer Returns: the image produced Since: JDK1.0
	createImage	`Image` createImage(int width, int height) Creates an off-screen drawable image to be used for double buffering. public Image createImage(int width, int height) Description copied from class: `Component` Creates an off-screen drawable image to be used for double buffering. Parameters: `width` - the specified width `height` - the specified height Returns: an off-screen drawable image, which can be used for double buffering. The return value may be `null` if the component is not displayable. This will always happen if `GraphicsEnvironment.isHeadless()` returns `true`. Since: JDK1.0 See Also: `Component.isDisplayable()`, `GraphicsEnvironment.isHeadless()`
	createVolatileImage	`java.awt.image.VolatileImage` createVolatileImage(int width, int height) Creates a volatile off-screen drawable image to be used for double buffering. public java.awt.image.VolatileImage createVolatileImage(int width, int height) Description copied from class: `Component` Creates a volatile off-screen drawable image to be used for double buffering. Parameters: `width` - the specified width. `height` - the specified height. Returns: an off-screen drawable image, which can be used for double buffering. The return value may be `null` if the component is not displayable. This will always happen if `GraphicsEnvironment.isHeadless()` returns `true`. Since: 1.4 See Also: `VolatileImage`, `Component.isDisplayable()`, `GraphicsEnvironment.isHeadless()`
	createVolatileImage	`java.awt.image.VolatileImage` createVolatileImage(int width, int height, ImageCapabilities caps) Creates a volatile off-screen drawable image, with the given capabilities. public java.awt.image.VolatileImage createVolatileImage(int width, int height, ImageCapabilities caps) throws AWTException Description copied from class: `Component` Creates a volatile off-screen drawable image, with the given capabilities. The contents of this image may be lost at any time due to operating system issues, so the image must be managed via the `VolatileImage` interface. Parameters: `width` - the specified width. `height` - the specified height. `caps` - the image capabilities Returns: a VolatileImage object, which can be used to manage surface contents loss and capabilities. Throws: `AWTException` - if an image with the specified capabilities cannot be created Since: 1.4 See Also: `VolatileImage`
	imageUpdate	`boolean` imageUpdate(Image img, int infoflags, int x, int y, int w, int h) Repaints the component when the image has changed. public boolean imageUpdate(Image img, int infoflags, int x, int y, int w, int h) Description copied from class: `Component` Repaints the component when the image has changed. This `imageUpdate` method of an `ImageObserver` is called when more information about an image which had been previously requested using an asynchronous routine such as the `drawImage` method of `Graphics` becomes available. See the definition of `imageUpdate` for more information on this method and its arguments. The `imageUpdate` method of `Component` incrementally draws an image on the component as more of the bits of the image are available. If the system property `awt.image.incrementaldraw` is missing or has the value `true`, the image is incrementally drawn. If the system property has any other value, then the image is not drawn until it has been completely loaded. Also, if incremental drawing is in effect, the value of the system property `awt.image.redrawrate` is interpreted as an integer to give the maximum redraw rate, in milliseconds. If the system property is missing or cannot be interpreted as an integer, the redraw rate is once every 100ms. The interpretation of the `x`, `y`, `width`, and `height` arguments depends on the value of the `infoflags` argument. Specified by: `imageUpdate` in interface `java.awt.image.ImageObserver` Parameters: `img` - the image being observed `infoflags` - see `imageUpdate` for more information `x` - the x coordinate `y` - the y coordinate `w` - the width `h` - the height Returns: `false` if the infoflags indicate that the image is completely loaded; `true` otherwise. Since: JDK1.0 See Also: `ImageObserver`, `Graphics.drawImage(Image, int, int, Color, java.awt.image.ImageObserver)`, `Graphics.drawImage(Image, int, int, java.awt.image.ImageObserver)`, `Graphics.drawImage(Image, int, int, int, int, Color, java.awt.image.ImageObserver)`, `Graphics.drawImage(Image, int, int, int, int, java.awt.image.ImageObserver)`, `ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)`
	prepareImage	`boolean` prepareImage(Image image, java.awt.image.ImageObserver observer) Prepares an image for rendering on this component. public boolean prepareImage(Image image, java.awt.image.ImageObserver observer) Description copied from class: `Component` Prepares an image for rendering on this component. The image data is downloaded asynchronously in another thread and the appropriate screen representation of the image is generated. Parameters: `image` - the `Image` for which to prepare a screen representation `observer` - the `ImageObserver` object to be notified as the image is being prepared Returns: `true` if the image has already been fully prepared; `false` otherwise Since: JDK1.0
	prepareImage	`boolean` prepareImage(Image image, int width, int height, java.awt.image.ImageObserver observer) Prepares an image for rendering on this component at the specified width and height. public boolean prepareImage(Image image, int width, int height, java.awt.image.ImageObserver observer) Description copied from class: `Component` Prepares an image for rendering on this component at the specified width and height. The image data is downloaded asynchronously in another thread, and an appropriately scaled screen representation of the image is generated. Parameters: `image` - the instance of `Image` for which to prepare a screen representation `width` - the width of the desired screen representation `height` - the height of the desired screen representation `observer` - the `ImageObserver` object to be notified as the image is being prepared Returns: `true` if the image has already been fully prepared; `false` otherwise Since: JDK1.0 See Also: `ImageObserver`

Layout Methods
Modifier and Type	Method and Description
	bounds	`Rectangle` bounds() Deprecated. As of JDK version 1.1, replaced by `getBounds()`. @Deprecated public Rectangle bounds() Deprecated. As of JDK version 1.1, replaced by `getBounds()`.
	contains	`boolean` contains(int x, int y) Checks whether this component "contains" the specified point, where `x` and `y` are defined to be relative to the coordinate system of this component. public boolean contains(int x, int y) Description copied from class: `Component` Checks whether this component "contains" the specified point, where `x` and `y` are defined to be relative to the coordinate system of this component. Parameters: `x` - the x coordinate of the point `y` - the y coordinate of the point Since: JDK1.1 See Also: `Component.getComponentAt(int, int)`
	contains	`boolean` contains(Point p) Checks whether this component "contains" the specified point, where the point's x and y coordinates are defined to be relative to the coordinate system of this component. public boolean contains(Point p) Description copied from class: `Component` Checks whether this component "contains" the specified point, where the point's x and y coordinates are defined to be relative to the coordinate system of this component. Parameters: `p` - the point Throws: `java.lang.NullPointerException` - if `p` is `null` Since: JDK1.1 See Also: `Component.getComponentAt(Point)`
	doLayout	`void` doLayout() Causes this container to lay out its components. public void doLayout() Causes this container to lay out its components. Most programs should not call this method directly, but should invoke the `validate` method instead. Overrides: `doLayout` in class `Component` Since: JDK1.1 See Also: `LayoutManager.layoutContainer(java.awt.Container)`, `setLayout(java.awt.LayoutManager)`, `validate()`
	findComponentAt	`Component` findComponentAt(int x, int y) Locates the visible child component that contains the specified position. public Component findComponentAt(int x, int y) Locates the visible child component that contains the specified position. The top-most child component is returned in the case where there is overlap in the components. If the containing child component is a Container, this method will continue searching for the deepest nested child component. Components which are not visible are ignored during the search. The findComponentAt method is different from getComponentAt in that getComponentAt only searches the Container's immediate children; if the containing component is a Container, findComponentAt will search that child to find a nested component. Parameters: `x` - the x coordinate `y` - the y coordinate Returns: null if the component does not contain the position. If there is no child component at the requested point and the point is within the bounds of the container the container itself is returned. Since: 1.2 See Also: `Component.contains(int, int)`, `getComponentAt(int, int)`
	findComponentAt	`Component` findComponentAt(Point p) Locates the visible child component that contains the specified point. public Component findComponentAt(Point p) Locates the visible child component that contains the specified point. The top-most child component is returned in the case where there is overlap in the components. If the containing child component is a Container, this method will continue searching for the deepest nested child component. Components which are not visible are ignored during the search. The findComponentAt method is different from getComponentAt in that getComponentAt only searches the Container's immediate children; if the containing component is a Container, findComponentAt will search that child to find a nested component. Parameters: `p` - the point. Returns: null if the component does not contain the position. If there is no child component at the requested point and the point is within the bounds of the container the container itself is returned. Throws: `java.lang.NullPointerException` - if `p` is `null` Since: 1.2 See Also: `Component.contains(int, int)`, `getComponentAt(int, int)`
	getAlignmentX	`float` getAlignmentX() Returns the alignment along the x axis. public float getAlignmentX() Returns the alignment along the x axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc. Overrides: `getAlignmentX` in class `Component`
	getAlignmentY	`float` getAlignmentY() Returns the alignment along the y axis. public float getAlignmentY() Returns the alignment along the y axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc. Overrides: `getAlignmentY` in class `Component`
	getBaseline	`int` getBaseline(int width, int height) Returns the baseline. public int getBaseline(int width, int height) Description copied from class: `Component` Returns the baseline. The baseline is measured from the top of the component. This method is primarily meant for `LayoutManager`s to align components along their baseline. A return value less than 0 indicates this component does not have a reasonable baseline and that `LayoutManager`s should not align this component on its baseline. The default implementation returns -1. Subclasses that support baseline should override appropriately. If a value >= 0 is returned, then the component has a valid baseline for any size >= the minimum size and `getBaselineResizeBehavior` can be used to determine how the baseline changes with size. Parameters: `width` - the width to get the baseline for `height` - the height to get the baseline for Returns: the baseline or < 0 indicating there is no reasonable baseline Throws: `java.lang.IllegalArgumentException` - if width or height is < 0 Since: 1.6 See Also: `Component.getBaselineResizeBehavior()`, `FontMetrics`
	getBaselineResizeBehavior	`Component.BaselineResizeBehavior` getBaselineResizeBehavior() Returns an enum indicating how the baseline of the component changes as the size changes. public Component.BaselineResizeBehavior getBaselineResizeBehavior() Description copied from class: `Component` Returns an enum indicating how the baseline of the component changes as the size changes. This method is primarily meant for layout managers and GUI builders. The default implementation returns `BaselineResizeBehavior.OTHER`. Subclasses that have a baseline should override appropriately. Subclasses should never return `null`; if the baseline can not be calculated return `BaselineResizeBehavior.OTHER`. Callers should first ask for the baseline using `getBaseline` and if a value >= 0 is returned use this method. It is acceptable for this method to return a value other than `BaselineResizeBehavior.OTHER` even if `getBaseline` returns a value less than 0. Returns: an enum indicating how the baseline changes as the component size changes Since: 1.6 See Also: `Component.getBaseline(int, int)`
	getBounds	`Rectangle` getBounds() Gets the bounds of this component in the form of a `Rectangle` object. public Rectangle getBounds() Description copied from class: `Component` Gets the bounds of this component in the form of a `Rectangle` object. The bounds specify this component's width, height, and location relative to its parent. Returns: a rectangle indicating this component's bounds See Also: `Component.setBounds(int, int, int, int)`, `Component.getLocation()`, `Component.getSize()`
	getBounds	`Rectangle` getBounds(Rectangle rv) Stores the bounds of this component into "return value" rv and return rv. public Rectangle getBounds(Rectangle rv) Description copied from class: `Component` Stores the bounds of this component into "return value" rv and return rv. If rv is `null` a new `Rectangle` is allocated. This version of `getBounds` is useful if the caller wants to avoid allocating a new `Rectangle` object on the heap. Parameters: `rv` - the return value, modified to the components bounds Returns: rv
	getComponentAt	`Component` getComponentAt(int x, int y) Locates the component that contains the x,y position. public Component getComponentAt(int x, int y) Locates the component that contains the x,y position. The top-most child component is returned in the case where there is overlap in the components. This is determined by finding the component closest to the index 0 that claims to contain the given point via Component.contains(), except that Components which have native peers take precedence over those which do not (i.e., lightweight Components). Overrides: `getComponentAt` in class `Component` Parameters: `x` - the x coordinate `y` - the y coordinate Returns: null if the component does not contain the position. If there is no child component at the requested point and the point is within the bounds of the container the container itself is returned; otherwise the top-most child is returned. Since: JDK1.1 See Also: `Component.contains(int, int)`
	getComponentAt	`Component` getComponentAt(Point p) Gets the component that contains the specified point. public Component getComponentAt(Point p) Gets the component that contains the specified point. Overrides: `getComponentAt` in class `Component` Parameters: `p` - the point. Returns: returns the component that contains the point, or `null` if the component does not contain the point. Since: JDK1.1 See Also: `Component.contains(int, int)`
	getHeight	`int` getHeight() Returns the current height of this component. public int getHeight() Description copied from class: `Component` Returns the current height of this component. This method is preferable to writing `component.getBounds().height`, or `component.getSize().height` because it doesn't cause any heap allocations. Returns: the current height of this component Since: 1.2
	getInsets	`Insets` getInsets() Determines the insets of this container, which indicate the size of the container's border. public Insets getInsets() Determines the insets of this container, which indicate the size of the container's border. A `Frame` object, for example, has a top inset that corresponds to the height of the frame's title bar. Returns: the insets of this container. Since: JDK1.1 See Also: `Insets`, `LayoutManager`
	getLayout	`LayoutManager` getLayout() Gets the layout manager for this container. public LayoutManager getLayout() Gets the layout manager for this container. See Also: `doLayout()`, `setLayout(java.awt.LayoutManager)`
	getLocation	`Point` getLocation() Gets the location of this component in the form of a point specifying the component's top-left corner. public Point getLocation() Description copied from class: `Component` Gets the location of this component in the form of a point specifying the component's top-left corner. The location will be relative to the parent's coordinate space. Due to the asynchronous nature of native event handling, this method can return outdated values (for instance, after several calls of `setLocation()` in rapid succession). For this reason, the recommended method of obtaining a component's position is within `java.awt.event.ComponentListener.componentMoved()`, which is called after the operating system has finished moving the component. Returns: an instance of `Point` representing the top-left corner of the component's bounds in the coordinate space of the component's parent Since: JDK1.1 See Also: `Component.setLocation(int, int)`, `Component.getLocationOnScreen()`
	getLocation	`Point` getLocation(Point rv) Stores the x,y origin of this component into "return value" rv and return rv. public Point getLocation(Point rv) Description copied from class: `Component` Stores the x,y origin of this component into "return value" rv and return rv. If rv is `null` a new `Point` is allocated. This version of `getLocation` is useful if the caller wants to avoid allocating a new `Point` object on the heap. Parameters: `rv` - the return value, modified to the components location Returns: rv
	getMaximumSize	`Dimension` getMaximumSize() Returns the maximum size of this container. public Dimension getMaximumSize() Returns the maximum size of this container. If the maximum size has not been set explicitly by `Component.setMaximumSize(Dimension)` and the `LayoutManager` installed on this `Container` is an instance of `LayoutManager2`, then `LayoutManager2.maximumLayoutSize(Container)` is used to calculate the maximum size. Note: some implementations may cache the value returned from the `LayoutManager2`. Implementations that cache need not invoke `maximumLayoutSize` on the `LayoutManager2` every time this method is invoked, rather the `LayoutManager2` will only be queried after the `Container` becomes invalid. Overrides: `getMaximumSize` in class `Component` Returns: an instance of `Dimension` that represents the maximum size of this container. See Also: `getPreferredSize()`, `getMinimumSize()`, `getLayout()`, `LayoutManager2.maximumLayoutSize(Container)`, `Component.getMaximumSize()`
	getMinimumSize	`Dimension` getMinimumSize() Returns the minimum size of this container. public Dimension getMinimumSize() Returns the minimum size of this container. If the minimum size has not been set explicitly by `Component.setMinimumSize(Dimension)` and this `Container` has a `non-null` `LayoutManager`, then `LayoutManager.minimumLayoutSize(Container)` is used to calculate the minimum size. Note: some implementations may cache the value returned from the `LayoutManager`. Implementations that cache need not invoke `minimumLayoutSize` on the `LayoutManager` every time this method is invoked, rather the `LayoutManager` will only be queried after the `Container` becomes invalid. Overrides: `getMinimumSize` in class `Component` Returns: an instance of `Dimension` that represents the minimum size of this container. Since: JDK1.1 See Also: `getPreferredSize()`, `getMaximumSize()`, `getLayout()`, `LayoutManager.minimumLayoutSize(Container)`, `Component.getMinimumSize()`
	getMousePosition	`Point` getMousePosition(boolean allowChildren) Returns the position of the mouse pointer in this `Container`'s coordinate space if the `Container` is under the mouse pointer, otherwise returns `null`. public Point getMousePosition(boolean allowChildren) throws HeadlessException Returns the position of the mouse pointer in this `Container`'s coordinate space if the `Container` is under the mouse pointer, otherwise returns `null`. This method is similar to `Component.getMousePosition()` with the exception that it can take the `Container`'s children into account. If `allowChildren` is `false`, this method will return a non-null value only if the mouse pointer is above the `Container` directly, not above the part obscured by children. If `allowChildren` is `true`, this method returns a non-null value if the mouse pointer is above `Container` or any of its descendants. Parameters: `allowChildren` - true if children should be taken into account Returns: mouse coordinates relative to this `Component`, or null Throws: `HeadlessException` - if GraphicsEnvironment.isHeadless() returns true Since: 1.5 See Also: `Component.getMousePosition()`
	getPreferredSize	`Dimension` getPreferredSize() Returns the preferred size of this container. public Dimension getPreferredSize() Returns the preferred size of this container. If the preferred size has not been set explicitly by `Component.setPreferredSize(Dimension)` and this `Container` has a `non-null` `LayoutManager`, then `LayoutManager.preferredLayoutSize(Container)` is used to calculate the preferred size. Note: some implementations may cache the value returned from the `LayoutManager`. Implementations that cache need not invoke `preferredLayoutSize` on the `LayoutManager` every time this method is invoked, rather the `LayoutManager` will only be queried after the `Container` becomes invalid. Overrides: `getPreferredSize` in class `Component` Returns: an instance of `Dimension` that represents the preferred size of this container. See Also: `getMinimumSize()`, `getMaximumSize()`, `getLayout()`, `LayoutManager.preferredLayoutSize(Container)`, `Component.getPreferredSize()`
	getSize	`Dimension` getSize() Returns the size of this component in the form of a `Dimension` object. public Dimension getSize() Description copied from class: `Component` Returns the size of this component in the form of a `Dimension` object. The `height` field of the `Dimension` object contains this component's height, and the `width` field of the `Dimension` object contains this component's width. Returns: a `Dimension` object that indicates the size of this component Since: JDK1.1 See Also: `Component.setSize(int, int)`
	getSize	`Dimension` getSize(Dimension rv) Stores the width/height of this component into "return value" rv and return rv. public Dimension getSize(Dimension rv) Description copied from class: `Component` Stores the width/height of this component into "return value" rv and return rv. If rv is `null` a new `Dimension` object is allocated. This version of `getSize` is useful if the caller wants to avoid allocating a new `Dimension` object on the heap. Parameters: `rv` - the return value, modified to the components size Returns: rv
	getWidth	`int` getWidth() Returns the current width of this component. public int getWidth() Description copied from class: `Component` Returns the current width of this component. This method is preferable to writing `component.getBounds().width`, or `component.getSize().width` because it doesn't cause any heap allocations. Returns: the current width of this component Since: 1.2
	getX	`int` getX() Returns the current x coordinate of the components origin. public int getX() Description copied from class: `Component` Returns the current x coordinate of the components origin. This method is preferable to writing `component.getBounds().x`, or `component.getLocation().x` because it doesn't cause any heap allocations. Returns: the current x coordinate of the components origin Since: 1.2
	getY	`int` getY() Returns the current y coordinate of the components origin. public int getY() Description copied from class: `Component` Returns the current y coordinate of the components origin. This method is preferable to writing `component.getBounds().y`, or `component.getLocation().y` because it doesn't cause any heap allocations. Returns: the current y coordinate of the components origin Since: 1.2
	insets	`Insets` insets() Deprecated. As of JDK version 1.1, replaced by `getInsets()`. @Deprecated public Insets insets() Deprecated. As of JDK version 1.1, replaced by `getInsets()`.
	inside	`boolean` inside(int x, int y) Deprecated. As of JDK version 1.1, replaced by contains(int, int). @Deprecated public boolean inside(int x, int y) Deprecated. As of JDK version 1.1, replaced by contains(int, int).
	invalidate	`void` invalidate() Invalidates the container. public void invalidate() Invalidates the container. If the `LayoutManager` installed on this container is an instance of the `LayoutManager2` interface, then the `LayoutManager2.invalidateLayout(Container)` method is invoked on it supplying this `Container` as the argument. Afterwards this method marks this container invalid, and invalidates its ancestors. See the `Component.invalidate()` method for more details. Overrides: `invalidate` in class `Component` See Also: `validate()`, `layout()`, `LayoutManager2`
	isMaximumSizeSet	`boolean` isMaximumSizeSet() Returns true if the maximum size has been set to a non-`null` value otherwise returns false. public boolean isMaximumSizeSet() Description copied from class: `Component` Returns true if the maximum size has been set to a non-`null` value otherwise returns false. Returns: true if `maximumSize` is non-`null`, false otherwise Since: 1.5
	isMinimumSizeSet	`boolean` isMinimumSizeSet() Returns whether or not `setMinimumSize` has been invoked with a non-null value. public boolean isMinimumSizeSet() Description copied from class: `Component` Returns whether or not `setMinimumSize` has been invoked with a non-null value. Returns: true if `setMinimumSize` has been invoked with a non-null value. Since: 1.5
	isPreferredSizeSet	`boolean` isPreferredSizeSet() Returns true if the preferred size has been set to a non-`null` value otherwise returns false. public boolean isPreferredSizeSet() Description copied from class: `Component` Returns true if the preferred size has been set to a non-`null` value otherwise returns false. Returns: true if `setPreferredSize` has been invoked with a non-null value. Since: 1.5
	isValid	`boolean` isValid() Determines whether this component is valid. public boolean isValid() Description copied from class: `Component` Determines whether this component is valid. A component is valid when it is correctly sized and positioned within its parent container and all its children are also valid. In order to account for peers' size requirements, components are invalidated before they are first shown on the screen. By the time the parent container is fully realized, all its components will be valid. Returns: `true` if the component is valid, `false` otherwise Since: JDK1.0 See Also: `Component.validate()`, `Component.invalidate()`
	isValidateRoot	`boolean` isValidateRoot() Indicates if this container is a validate root. public boolean isValidateRoot() Indicates if this container is a validate root. Layout-related changes, such as bounds of the validate root descendants, do not affect the layout of the validate root parent. This peculiarity enables the `invalidate()` method to stop invalidating the component hierarchy when the method encounters a validate root. However, to preserve backward compatibility this new optimized behavior is enabled only when the `java.awt.smartInvalidate` system property value is set to `true`. If a component hierarchy contains validate roots and the new optimized `invalidate()` behavior is enabled, the `validate()` method must be invoked on the validate root of a previously invalidated component to restore the validity of the hierarchy later. Otherwise, calling the `validate()` method on the top-level container (such as a `Frame` object) should be used to restore the validity of the component hierarchy. The `Window` class and the `Applet` class are the validate roots in AWT. Swing introduces more validate roots. Returns: whether this container is a validate root Since: 1.7 See Also: `invalidate()`, `Component.invalidate()`, `JComponent.isValidateRoot()`, `JComponent.revalidate()`
	layout	`void` layout() Deprecated. As of JDK version 1.1, replaced by `doLayout()`. @Deprecated public void layout() Deprecated. As of JDK version 1.1, replaced by `doLayout()`.
	locate	`Component` locate(int x, int y) Deprecated. As of JDK version 1.1, replaced by `getComponentAt(int, int)`. @Deprecated public Component locate(int x, int y) Deprecated. As of JDK version 1.1, replaced by `getComponentAt(int, int)`.
	location	`Point` location() Deprecated. As of JDK version 1.1, replaced by `getLocation()`. @Deprecated public Point location() Deprecated. As of JDK version 1.1, replaced by `getLocation()`.
	minimumSize	`Dimension` minimumSize() Deprecated. As of JDK version 1.1, replaced by `getMinimumSize()`. @Deprecated public Dimension minimumSize() Deprecated. As of JDK version 1.1, replaced by `getMinimumSize()`.
	move	`void` move(int x, int y) Deprecated. As of JDK version 1.1, replaced by `setLocation(int, int)`. @Deprecated public void move(int x, int y) Deprecated. As of JDK version 1.1, replaced by `setLocation(int, int)`.
	preferredSize	`Dimension` preferredSize() Deprecated. As of JDK version 1.1, replaced by `getPreferredSize()`. @Deprecated public Dimension preferredSize() Deprecated. As of JDK version 1.1, replaced by `getPreferredSize()`.
	reshape	`void` reshape(int x, int y, int width, int height) Deprecated. As of JDK version 1.1, replaced by `setBounds(int, int, int, int)`. @Deprecated public void reshape(int x, int y, int width, int height) Deprecated. As of JDK version 1.1, replaced by `setBounds(int, int, int, int)`.
	resize	`void` resize(Dimension d) Deprecated. As of JDK version 1.1, replaced by `setSize(Dimension)`. @Deprecated public void resize(Dimension d) Deprecated. As of JDK version 1.1, replaced by `setSize(Dimension)`.
	resize	`void` resize(int width, int height) Deprecated. As of JDK version 1.1, replaced by `setSize(int, int)`. @Deprecated public void resize(int width, int height) Deprecated. As of JDK version 1.1, replaced by `setSize(int, int)`.
	revalidate	`void` revalidate() Revalidates the component hierarchy up to the nearest validate root. public void revalidate() Description copied from class: `Component` Revalidates the component hierarchy up to the nearest validate root. This method first invalidates the component hierarchy starting from this component up to the nearest validate root. Afterwards, the component hierarchy is validated starting from the nearest validate root. This is a convenience method supposed to help application developers avoid looking for validate roots manually. Basically, it's equivalent to first calling the `Component.invalidate()` method on this component, and then calling the `Component.validate()` method on the nearest validate root. Since: 1.7 See Also: `isValidateRoot()`
	setBounds	`void` setBounds(int x, int y, int width, int height) Moves and resizes this component. public void setBounds(int x, int y, int width, int height) Description copied from class: `Component` Moves and resizes this component. The new location of the top-left corner is specified by `x` and `y`, and the new size is specified by `width` and `height`. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `x` - the new x-coordinate of this component `y` - the new y-coordinate of this component `width` - the new `width` of this component `height` - the new `height` of this component Since: JDK1.1 See Also: `Component.getBounds()`, `Component.setLocation(int, int)`, `Component.setLocation(Point)`, `Component.setSize(int, int)`, `Component.setSize(Dimension)`, `Component.invalidate()`
	setBounds	`void` setBounds(Rectangle r) Moves and resizes this component to conform to the new bounding rectangle `r`. public void setBounds(Rectangle r) Description copied from class: `Component` Moves and resizes this component to conform to the new bounding rectangle `r`. This component's new position is specified by `r.x` and `r.y`, and its new size is specified by `r.width` and `r.height` This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `r` - the new bounding rectangle for this component Throws: `java.lang.NullPointerException` - if `r` is `null` Since: JDK1.1 See Also: `Component.getBounds()`, `Component.setLocation(int, int)`, `Component.setLocation(Point)`, `Component.setSize(int, int)`, `Component.setSize(Dimension)`, `Component.invalidate()`
	setLayout	`void` setLayout(LayoutManager mgr) Sets the layout manager for this container. public void setLayout(LayoutManager mgr) Sets the layout manager for this container. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `mgr` - the specified layout manager See Also: `doLayout()`, `getLayout()`, `invalidate()`
	setLocation	`void` setLocation(int x, int y) Moves this component to a new location. public void setLocation(int x, int y) Description copied from class: `Component` Moves this component to a new location. The top-left corner of the new location is specified by the `x` and `y` parameters in the coordinate space of this component's parent. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `x` - the x-coordinate of the new location's top-left corner in the parent's coordinate space `y` - the y-coordinate of the new location's top-left corner in the parent's coordinate space Since: JDK1.1 See Also: `Component.getLocation()`, `Component.setBounds(int, int, int, int)`, `Component.invalidate()`
	setLocation	`void` setLocation(Point p) Moves this component to a new location. public void setLocation(Point p) Description copied from class: `Component` Moves this component to a new location. The top-left corner of the new location is specified by point `p`. Point `p` is given in the parent's coordinate space. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `p` - the point defining the top-left corner of the new location, given in the coordinate space of this component's parent Since: JDK1.1 See Also: `Component.getLocation()`, `Component.setBounds(int, int, int, int)`, `Component.invalidate()`
	setMaximumSize	`void` setMaximumSize(Dimension maximumSize) Sets the maximum size of this component to a constant value. public void setMaximumSize(Dimension maximumSize) Description copied from class: `Component` Sets the maximum size of this component to a constant value. Subsequent calls to `getMaximumSize` will always return this value. Setting the maximum size to `null` restores the default behavior. Parameters: `maximumSize` - a `Dimension` containing the desired maximum allowable size Since: 1.5 See Also: `Component.getMaximumSize()`, `Component.isMaximumSizeSet()`
	setMinimumSize	`void` setMinimumSize(Dimension minimumSize) Sets the minimum size of this component to a constant value. public void setMinimumSize(Dimension minimumSize) Description copied from class: `Component` Sets the minimum size of this component to a constant value. Subsequent calls to `getMinimumSize` will always return this value. Setting the minimum size to `null` restores the default behavior. Parameters: `minimumSize` - the new minimum size of this component Since: 1.5 See Also: `Component.getMinimumSize()`, `Component.isMinimumSizeSet()`
	setPreferredSize	`void` setPreferredSize(Dimension preferredSize) Sets the preferred size of this component to a constant value. public void setPreferredSize(Dimension preferredSize) Description copied from class: `Component` Sets the preferred size of this component to a constant value. Subsequent calls to `getPreferredSize` will always return this value. Setting the preferred size to `null` restores the default behavior. Parameters: `preferredSize` - The new preferred size, or null Since: 1.5 See Also: `Component.getPreferredSize()`, `Component.isPreferredSizeSet()`
	setSize	`void` setSize(Dimension d) Resizes this component so that it has width `d.width` and height `d.height`. public void setSize(Dimension d) Description copied from class: `Component` Resizes this component so that it has width `d.width` and height `d.height`. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `d` - the dimension specifying the new size of this component Throws: `java.lang.NullPointerException` - if `d` is `null` Since: JDK1.1 See Also: `Component.setSize(int, int)`, `Component.setBounds(int, int, int, int)`, `Component.invalidate()`
	setSize	`void` setSize(int width, int height) Resizes this component so that it has width `width` and height `height`. public void setSize(int width, int height) Description copied from class: `Component` Resizes this component so that it has width `width` and height `height`. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `width` - the new width of this component in pixels `height` - the new height of this component in pixels Since: JDK1.1 See Also: `Component.getSize()`, `Component.setBounds(int, int, int, int)`, `Component.invalidate()`
	size	`Dimension` size() Deprecated. As of JDK version 1.1, replaced by `getSize()`. @Deprecated public Dimension size() Deprecated. As of JDK version 1.1, replaced by `getSize()`.
	validate	`void` validate() Validates this container and all of its subcomponents. public void validate() Validates this container and all of its subcomponents. Validating a container means laying out its subcomponents. Layout-related changes, such as setting the bounds of a component, or adding a component to the container, invalidate the container automatically. Note that the ancestors of the container may be invalidated also (see `Component.invalidate()` for details.) Therefore, to restore the validity of the hierarchy, the `validate()` method should be invoked on the top-most invalid container of the hierarchy. Validating the container may be a quite time-consuming operation. For performance reasons a developer may postpone the validation of the hierarchy till a set of layout-related operations completes, e.g. after adding all the children to the container. If this `Container` is not valid, this method invokes the `validateTree` method and marks this `Container` as valid. Otherwise, no action is performed. Overrides: `validate` in class `Component` See Also: `add(java.awt.Component)`, `invalidate()`, `isValidateRoot()`, `JComponent.revalidate()`, `validateTree()`
	validateTree	`protected void` validateTree() Recursively descends the container tree and recomputes the layout for any subtrees marked as needing it (those marked as invalid). protected void validateTree() Recursively descends the container tree and recomputes the layout for any subtrees marked as needing it (those marked as invalid). Synchronization should be provided by the method that calls this one: `validate`. See Also: `doLayout()`, `validate()`

Painting Methods
Modifier and Type	Method and Description
	getIgnoreRepaint	`boolean` getIgnoreRepaint() public boolean getIgnoreRepaint()
	paint	`void` paint(Graphics g) Paints the container. public void paint(Graphics g) Paints the container. This forwards the paint to any lightweight components that are children of this container. If this method is reimplemented, super.paint(g) should be called so that lightweight components are properly rendered. If a child component is entirely clipped by the current clipping setting in g, paint() will not be forwarded to that child. Overrides: `paint` in class `Component` Parameters: `g` - the specified Graphics window See Also: `Component.update(Graphics)`
	paintAll	`void` paintAll(Graphics g) Paints this component and all of its subcomponents. public void paintAll(Graphics g) Description copied from class: `Component` Paints this component and all of its subcomponents. The origin of the graphics context, its (`0`, `0`) coordinate point, is the top-left corner of this component. The clipping region of the graphics context is the bounding rectangle of this component. Parameters: `g` - the graphics context to use for painting Since: JDK1.0 See Also: `Component.paint(java.awt.Graphics)`
	paintComponents	`void` paintComponents(Graphics g) Paints each of the components in this container. public void paintComponents(Graphics g) Paints each of the components in this container. Parameters: `g` - the graphics context. See Also: `Component.paint(java.awt.Graphics)`, `Component.paintAll(java.awt.Graphics)`
	repaint	`void` repaint() Repaints this component. public void repaint() Description copied from class: `Component` Repaints this component. If this component is a lightweight component, this method causes a call to this component's `paint` method as soon as possible. Otherwise, this method causes a call to this component's `update` method as soon as possible. Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing. Since: JDK1.0 See Also: `Component.update(Graphics)`
	repaint	`void` repaint(int x, int y, int width, int height) Repaints the specified rectangle of this component. public void repaint(int x, int y, int width, int height) Description copied from class: `Component` Repaints the specified rectangle of this component. If this component is a lightweight component, this method causes a call to this component's `paint` method as soon as possible. Otherwise, this method causes a call to this component's `update` method as soon as possible. Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing. Parameters: `x` - the x coordinate `y` - the y coordinate `width` - the width `height` - the height Since: JDK1.0 See Also: `Component.update(Graphics)`
	repaint	`void` repaint(long tm) Repaints the component. public void repaint(long tm) Description copied from class: `Component` Repaints the component. If this component is a lightweight component, this results in a call to `paint` within `tm` milliseconds. Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing. Parameters: `tm` - maximum time in milliseconds before update Since: JDK1.0 See Also: `Component.paint(java.awt.Graphics)`, `Component.update(Graphics)`
	repaint	`void` repaint(long tm, int x, int y, int width, int height) Repaints the specified rectangle of this component within `tm` milliseconds. public void repaint(long tm, int x, int y, int width, int height) Description copied from class: `Component` Repaints the specified rectangle of this component within `tm` milliseconds. If this component is a lightweight component, this method causes a call to this component's `paint` method. Otherwise, this method causes a call to this component's `update` method. Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing. Parameters: `tm` - maximum time in milliseconds before update `x` - the x coordinate `y` - the y coordinate `width` - the width `height` - the height Since: JDK1.0 See Also: `Component.update(Graphics)`
	setIgnoreRepaint	`void` setIgnoreRepaint(boolean ignoreRepaint) Sets whether or not paint messages received from the operating system should be ignored. public void setIgnoreRepaint(boolean ignoreRepaint) Description copied from class: `Component` Sets whether or not paint messages received from the operating system should be ignored. This does not affect paint events generated in software by the AWT, unless they are an immediate response to an OS-level paint message. This is useful, for example, if running under full-screen mode and better performance is desired, or if page-flipping is used as the buffer strategy. Since: 1.4 See Also: `Component.getIgnoreRepaint()`, `Canvas.createBufferStrategy(int)`, `Window.createBufferStrategy(int)`, `BufferStrategy`, `GraphicsDevice.setFullScreenWindow(java.awt.Window)`
	update	`void` update(Graphics g) Updates the container. public void update(Graphics g) Updates the container. This forwards the update to any lightweight components that are children of this container. If this method is reimplemented, super.update(g) should be called so that lightweight components are properly rendered. If a child component is entirely clipped by the current clipping setting in g, update() will not be forwarded to that child. Overrides: `update` in class `Component` Parameters: `g` - the specified Graphics window See Also: `Component.update(Graphics)`

Printing Methods
Modifier and Type	Method and Description
	list	`void` list() Prints a listing of this component to the standard system output stream `System.out`. public void list() Description copied from class: `Component` Prints a listing of this component to the standard system output stream `System.out`. Since: JDK1.0 See Also: `System.out`
	list	`void` list(java.io.PrintStream out) Prints a listing of this component to the specified output stream. public void list(java.io.PrintStream out) Description copied from class: `Component` Prints a listing of this component to the specified output stream. Parameters: `out` - a print stream Throws: `java.lang.NullPointerException` - if `out` is `null` Since: JDK1.0
	list	`void` list(java.io.PrintStream out, int indent) Prints a listing of this container to the specified output stream. public void list(java.io.PrintStream out, int indent) Prints a listing of this container to the specified output stream. The listing starts at the specified indentation. The immediate children of the container are printed with an indentation of `indent+1`. The children of those children are printed at `indent+2` and so on. Overrides: `list` in class `Component` Parameters: `out` - a print stream `indent` - the number of spaces to indent Throws: `java.lang.NullPointerException` - if `out` is `null` Since: JDK1.0 See Also: `Component.list(java.io.PrintStream, int)`
	list	`void` list(java.io.PrintWriter out) Prints a listing to the specified print writer. public void list(java.io.PrintWriter out) Description copied from class: `Component` Prints a listing to the specified print writer. Parameters: `out` - the print writer to print to Throws: `java.lang.NullPointerException` - if `out` is `null` Since: JDK1.1
	list	`void` list(java.io.PrintWriter out, int indent) Prints out a list, starting at the specified indentation, to the specified print writer. public void list(java.io.PrintWriter out, int indent) Prints out a list, starting at the specified indentation, to the specified print writer. The immediate children of the container are printed with an indentation of `indent+1`. The children of those children are printed at `indent+2` and so on. Overrides: `list` in class `Component` Parameters: `out` - a print writer `indent` - the number of spaces to indent Throws: `java.lang.NullPointerException` - if `out` is `null` Since: JDK1.1 See Also: `Component.list(java.io.PrintWriter, int)`
	print	`void` print(Graphics g) Prints the container. public void print(Graphics g) Prints the container. This forwards the print to any lightweight components that are children of this container. If this method is reimplemented, super.print(g) should be called so that lightweight components are properly rendered. If a child component is entirely clipped by the current clipping setting in g, print() will not be forwarded to that child. Overrides: `print` in class `Component` Parameters: `g` - the specified Graphics window See Also: `Component.update(Graphics)`
	printAll	`void` printAll(Graphics g) Prints this component and all of its subcomponents. public void printAll(Graphics g) Description copied from class: `Component` Prints this component and all of its subcomponents. The origin of the graphics context, its (`0`, `0`) coordinate point, is the top-left corner of this component. The clipping region of the graphics context is the bounding rectangle of this component. Parameters: `g` - the graphics context to use for printing Since: JDK1.0 See Also: `Component.print(Graphics)`
	printComponents	`void` printComponents(Graphics g) Prints each of the components in this container. public void printComponents(Graphics g) Prints each of the components in this container. Parameters: `g` - the graphics context. See Also: `Component.print(java.awt.Graphics)`, `Component.printAll(java.awt.Graphics)`

Other Methods
Modifier and Type	Method and Description
	add	`void` add(PopupMenu popup) Adds the specified popup menu to the component. public void add(PopupMenu popup) Description copied from class: `Component` Adds the specified popup menu to the component. Parameters: `popup` - the popup menu to be added to the component. Throws: `java.lang.NullPointerException` - if `popup` is `null` Since: JDK1.1 See Also: `Component.remove(MenuComponent)`
	addNotify	`void` addNotify() Makes this Container displayable by connecting it to a native screen resource. public void addNotify() Makes this Container displayable by connecting it to a native screen resource. Making a container displayable will cause all of its children to be made displayable. This method is called internally by the toolkit and should not be called directly by programs. Overrides: `addNotify` in class `Component` See Also: `Component.isDisplayable()`, `removeNotify()`
	getDropTarget	`java.awt.dnd.DropTarget` getDropTarget() Gets the `DropTarget` associated with this `Component`. public java.awt.dnd.DropTarget getDropTarget() Description copied from class: `Component` Gets the `DropTarget` associated with this `Component`.
	getInputContext	`java.awt.im.InputContext` getInputContext() Gets the input context used by this component for handling the communication with input methods when text is entered in this component. public java.awt.im.InputContext getInputContext() Description copied from class: `Component` Gets the input context used by this component for handling the communication with input methods when text is entered in this component. By default, the input context used for the parent component is returned. Components may override this to return a private input context. Returns: the input context used by this component; `null` if no context can be determined Since: 1.2
	getInputMethodRequests	`java.awt.im.InputMethodRequests` getInputMethodRequests() Gets the input method request handler which supports requests from input methods for this component. public java.awt.im.InputMethodRequests getInputMethodRequests() Description copied from class: `Component` Gets the input method request handler which supports requests from input methods for this component. A component that supports on-the-spot text input must override this method to return an `InputMethodRequests` instance. At the same time, it also has to handle input method events. Returns: the input method request handler for this component, `null` by default Since: 1.2 See Also: `Component.addInputMethodListener(java.awt.event.InputMethodListener)`
	getPeer	`java.awt.peer.ComponentPeer` getPeer() Deprecated. As of JDK version 1.1, programs should not directly manipulate peers; replaced by `boolean isDisplayable()`. @Deprecated public java.awt.peer.ComponentPeer getPeer() Deprecated. As of JDK version 1.1, programs should not directly manipulate peers; replaced by `boolean isDisplayable()`.
	getTreeLock	`java.lang.Object` getTreeLock() Gets this component's locking object (the object that owns the thread synchronization monitor) for AWT component-tree and layout operations. public final java.lang.Object getTreeLock() Description copied from class: `Component` Gets this component's locking object (the object that owns the thread synchronization monitor) for AWT component-tree and layout operations. Returns: this component's locking object
	paramString	`protected java.lang.String` paramString() Returns a string representing the state of this `Container`. protected java.lang.String paramString() Returns a string representing the state of this `Container`. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be `null`. Overrides: `paramString` in class `Component` Returns: the parameter string of this container
	remove	`void` remove(MenuComponent popup) Removes the specified popup menu from the component. public void remove(MenuComponent popup) Description copied from class: `Component` Removes the specified popup menu from the component. Specified by: `remove` in interface `MenuContainer` Parameters: `popup` - the popup menu to be removed Since: JDK1.1 See Also: `Component.add(PopupMenu)`
	removeNotify	`void` removeNotify() Makes this Container undisplayable by removing its connection to its native screen resource. public void removeNotify() Makes this Container undisplayable by removing its connection to its native screen resource. Making a container undisplayable will cause all of its children to be made undisplayable. This method is called by the toolkit internally and should not be called directly by programs. Overrides: `removeNotify` in class `Component` See Also: `Component.isDisplayable()`, `addNotify()`
	setDropTarget	`void` setDropTarget(java.awt.dnd.DropTarget dt) Associate a `DropTarget` with this component. public void setDropTarget(java.awt.dnd.DropTarget dt) Description copied from class: `Component` Associate a `DropTarget` with this component. The `Component` will receive drops only if it is enabled. Parameters: `dt` - The DropTarget See Also: `Component.isEnabled()`
	toString	`java.lang.String` toString() Returns a string representation of this component and its values. public java.lang.String toString() Description copied from class: `Component` Returns a string representation of this component and its values. Overrides: `toString` in class `java.lang.Object` Returns: a string representation of this component Since: JDK1.0

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

SourceForge

Class Container

Methods inherited from class java.lang.Object