Component (Sample Document)

java.lang.Object
- java.awt.Component

All Implemented Interfaces:

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

Direct Known Subclasses:

Button, Canvas, Checkbox, Choice, Container, Label, List, Scrollbar, TextComponent

public abstract class Component extends java.lang.Object implements java.awt.image.ImageObserver, MenuContainer, java.io.Serializable
A component is an object having a graphical representation that can be displayed on the screen and that can interact with the user. Examples of components are the buttons, checkboxes, and scrollbars of a typical graphical user interface.
The Component class is the abstract superclass of the nonmenu-related Abstract Window Toolkit components. Class Component can also be extended directly to create a lightweight component. A lightweight component is a component that is not associated with a native window. On the contrary, a heavyweight component is associated with a native window. The isLightweight() method may be used to distinguish between the two kinds of the components.
Lightweight and heavyweight components may be mixed in a single component hierarchy. However, for correct operating of such a mixed hierarchy of components, the whole hierarchy must be valid. When the hierarchy gets invalidated, like after changing the bounds of components, or adding/removing components to/from containers, the whole hierarchy must be validated afterwards by means of the Container.validate() method invoked on the top-most invalid container of the hierarchy.

Serialization
It is important to note that only AWT listeners which conform to the Serializable protocol will be saved when the object is stored. If an AWT object has listeners that aren't marked serializable, they will be dropped at writeObject time. Developers will need, as always, to consider the implications of making an object serializable. One situation to watch out for is this:
```
    import java.awt.*;
    import java.awt.event.*;
    import java.io.Serializable;

    class MyApp implements ActionListener, Serializable
    {
        BigObjectThatShouldNotBeSerializedWithAButton bigOne;
        Button aButton = new Button();

        MyApp()
        {
            // Oops, now aButton has a listener with a reference
            // to bigOne!
            aButton.addActionListener(this);
        }

        public void actionPerformed(ActionEvent e)
        {
            System.out.println("Hello There");
        }
    }
 
```
In this example, serializing aButton by itself will cause MyApp and everything it refers to to be serialized as well. The problem is that the listener is serializable by coincidence, not by design. To separate the decisions about MyApp and the ActionListener being serializable one can use a nested class, as in the following example:
```
    import java.awt.*;
    import java.awt.event.*;
    import java.io.Serializable;

    class MyApp implements java.io.Serializable
    {
         BigObjectThatShouldNotBeSerializedWithAButton bigOne;
         Button aButton = new Button();

         static class MyActionListener implements ActionListener
         {
             public void actionPerformed(ActionEvent e)
             {
                 System.out.println("Hello There");
             }
         }

         MyApp()
         {
             aButton.addActionListener(new MyActionListener());
         }
    }
 
```
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.
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.
See Also:
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: `getBaselineResizeBehavior()`, `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`

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: `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: `getAlignmentX()`, `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: `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: `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: `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
	Modifier	Constructor and Description
	Component	`protected` Component() Constructs a new component. protected Component() Constructs a new component. Class `Component` can be extended directly to create a lightweight component that does not utilize an opaque native window. A lightweight component must be hosted by a native container somewhere higher up in the component tree (for example, by a `Frame` object).

Basic Attribute Methods
Modifier and Type	Method and Description
	applyComponentOrientation	`void` applyComponentOrientation(ComponentOrientation orientation) Sets the `ComponentOrientation` property of this component and all components contained within it. public void applyComponentOrientation(ComponentOrientation orientation) Sets the `ComponentOrientation` property of this component and all components contained within it. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `orientation` - the new component orientation of this component and the components contained within it. Throws: `java.lang.NullPointerException` - if `orientation` is null. Since: 1.4 See Also: `setComponentOrientation(java.awt.ComponentOrientation)`, `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) 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: `processKeyEvent(java.awt.event.KeyEvent)`
	getAccessibleContext	`javax.accessibility.AccessibleContext` getAccessibleContext() Gets the `AccessibleContext` associated with this `Component`. public javax.accessibility.AccessibleContext getAccessibleContext() 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() 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: `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() 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() 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() 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: `setCursor(java.awt.Cursor)`
	getFont	`Font` getFont() Gets the font of this component. public Font getFont() 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: `setFont(java.awt.Font)`
	getForeground	`Color` getForeground() Gets the foreground color of this component. public Color getForeground() 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: `setForeground(java.awt.Color)`
	getLocale	`java.util.Locale` getLocale() Gets the locale of this component. public java.util.Locale getLocale() 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: `setLocale(java.util.Locale)`
	getName	`java.lang.String` getName() Gets the name of the component. public java.lang.String getName() Gets the name of the component. Returns: this component's name Since: JDK1.1 See Also: `setName(java.lang.String)`
	getParent	`Container` getParent() Gets the parent of this component. public Container getParent() 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() 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() 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() 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: `Container.add(Component)`, `Window.pack()`, `Window.show()`, `Container.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() 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() 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: `setEnabled(boolean)`
	isFontSet	`boolean` isFontSet() Returns whether the font has been explicitly set for this Component. public boolean isFontSet() 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() 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() 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: `isDisplayable()`
	isOpaque	`boolean` isOpaque() Returns true if this component is completely opaque, returns false by default. public boolean isOpaque() 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: `isLightweight()`
	isShowing	`boolean` isShowing() Determines whether this component is showing on screen. public boolean isShowing() 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: `setVisible(boolean)`
	isVisible	`boolean` isVisible() Determines whether this component should be visible when its parent is visible. public boolean isVisible() 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: `setVisible(boolean)`
	setBackground	`void` setBackground(Color c) Sets the background color of this component. public void setBackground(Color c) 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: `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) 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`, `invalidate()`
	setCursor	`void` setCursor(Cursor cursor) Sets the cursor image to the specified cursor. public void setCursor(Cursor cursor) 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: `isEnabled()`, `isShowing()`, `getCursor()`, `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) 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: `isEnabled()`, `isLightweight()`
	setFont	`void` setFont(Font f) Sets the font of this component. public void setFont(Font f) Sets the font of this component. This method changes layout-related information, and therefore, invalidates the component hierarchy. Parameters: `f` - the font to become this component's font; if this parameter is `null` then this component will inherit the font of its parent Since: JDK1.0 See Also: `getFont()`, `invalidate()`
	setForeground	`void` setForeground(Color c) Sets the foreground color of this component. public void setForeground(Color c) 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: `getForeground()`
	setLocale	`void` setLocale(java.util.Locale l) Sets the locale of this component. public void setLocale(java.util.Locale l) 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: `getLocale()`, `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) 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: `getName()`
	setVisible	`void` setVisible(boolean b) Shows or hides this component depending on the value of parameter `b`. public void setVisible(boolean b) 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: `isVisible()`, `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) 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) 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: `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) 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) 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: `processEvent(java.awt.AWTEvent)`, `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) 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) 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: `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) 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: `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) 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: `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) 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: `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) 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) 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: `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) 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) 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: `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 `Component`. 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 `Component`. `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 `Component` `c` for its mouse listeners with the following code: MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class)); If no such listeners exist, this method returns an empty array. 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 component, 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: `getComponentListeners()`, `getFocusListeners()`, `getHierarchyListeners()`, `getHierarchyBoundsListeners()`, `getKeyListeners()`, `getMouseListeners()`, `getMouseMotionListeners()`, `getMouseWheelListeners()`, `getInputMethodListeners()`, `getPropertyChangeListeners()`
	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) 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`, `addComponentListener(java.awt.event.ComponentListener)`, `enableEvents(long)`
	processEvent	`protected void` processEvent(AWTEvent e) Processes events occurring on this component. protected void processEvent(AWTEvent e) Processes events occurring on this component. By default this method calls the appropriate `process<event type>Event` method for the given class of event. Note that if the event parameter is `null` the behavior is unspecified and may result in an exception. Parameters: `e` - the event Since: JDK1.1 See Also: `processComponentEvent(java.awt.event.ComponentEvent)`, `processFocusEvent(java.awt.event.FocusEvent)`, `processKeyEvent(java.awt.event.KeyEvent)`, `processMouseEvent(java.awt.event.MouseEvent)`, `processMouseMotionEvent(java.awt.event.MouseEvent)`, `processInputMethodEvent(java.awt.event.InputMethodEvent)`, `processHierarchyEvent(java.awt.event.HierarchyEvent)`, `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) 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`, `addFocusListener(java.awt.event.FocusListener)`, `enableEvents(long)`, `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) 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`, `addHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`, `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) 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`, `addHierarchyListener(java.awt.event.HierarchyListener)`, `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) 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`, `addInputMethodListener(java.awt.event.InputMethodListener)`, `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) 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`, `processEvent(java.awt.AWTEvent)`, `dispatchEvent(java.awt.AWTEvent)`, `addKeyListener(java.awt.event.KeyListener)`, `enableEvents(long)`, `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) 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`, `addMouseListener(java.awt.event.MouseListener)`, `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) 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`, `addMouseMotionListener(java.awt.event.MouseMotionListener)`, `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) 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`, `addMouseWheelListener(java.awt.event.MouseWheelListener)`, `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) 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`, `removeComponentListener(java.awt.event.ComponentListener)`, `getComponentListeners()`
	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) 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`, `removeFocusListener(java.awt.event.FocusListener)`, `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) 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`, `removeHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`, `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) 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`, `removeHierarchyListener(java.awt.event.HierarchyListener)`, `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) 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`, `removeInputMethodListener(java.awt.event.InputMethodListener)`, `getInputMethodListeners()`, `getInputMethodRequests()`
	addKeyListener	`void` addKeyListener(KeyListener l) Adds the specified key listener to receive key events from this component. public void addKeyListener(KeyListener l) 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`, `removeKeyListener(java.awt.event.KeyListener)`, `getKeyListeners()`
	addMouseListener	`void` addMouseListener(MouseListener l) Adds the specified mouse listener to receive mouse events from this component. public void addMouseListener(MouseListener l) 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`, `removeMouseListener(java.awt.event.MouseListener)`, `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) 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`, `removeMouseMotionListener(java.awt.event.MouseMotionListener)`, `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) 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`, `removeMouseWheelListener(java.awt.event.MouseWheelListener)`, `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 Component's font ("font") this Component's background color ("background") this Component's foreground color ("foreground") this Component's focusability ("focusable") this Component's focus traversal keys enabled state ("focusTraversalKeysEnabled") this Component's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys") this Component's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys") this Component's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys") this Component's preferred size ("preferredSize") this Component's minimum size ("minimumSize") this Component's maximum size ("maximumSize") this Component's name ("name") Note that if this `Component` 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. Parameters: `listener` - the property change listener to be added See Also: `removePropertyChangeListener(java.beans.PropertyChangeListener)`, `getPropertyChangeListeners()`, `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: this Component's font ("font") this Component's background color ("background") this Component's foreground color ("foreground") this Component's focusability ("focusable") this Component's focus traversal keys enabled state ("focusTraversalKeysEnabled") this Component's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys") this Component's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys") this Component's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys") Note that if this `Component` is inheriting a bound property, then no event will be fired in response to a change in the inherited property. If `propertyName` or `listener` is `null`, no exception is thrown and no action is taken. Parameters: `propertyName` - one of the property names listed above `listener` - the property change listener to be added See Also: `removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`, `getPropertyChangeListeners(java.lang.String)`, `addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`
	getComponentListeners	`ComponentListener[]` getComponentListeners() Returns an array of all the component listeners registered on this component. public ComponentListener[] getComponentListeners() 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: `addComponentListener(java.awt.event.ComponentListener)`, `removeComponentListener(java.awt.event.ComponentListener)`
	getFocusListeners	`FocusListener[]` getFocusListeners() Returns an array of all the focus listeners registered on this component. public FocusListener[] getFocusListeners() 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: `addFocusListener(java.awt.event.FocusListener)`, `removeFocusListener(java.awt.event.FocusListener)`
	getHierarchyBoundsListeners	`HierarchyBoundsListener[]` getHierarchyBoundsListeners() Returns an array of all the hierarchy bounds listeners registered on this component. public HierarchyBoundsListener[] getHierarchyBoundsListeners() 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: `addHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`, `removeHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`
	getHierarchyListeners	`HierarchyListener[]` getHierarchyListeners() Returns an array of all the hierarchy listeners registered on this component. public HierarchyListener[] getHierarchyListeners() 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: `addHierarchyListener(java.awt.event.HierarchyListener)`, `removeHierarchyListener(java.awt.event.HierarchyListener)`
	getInputMethodListeners	`InputMethodListener[]` getInputMethodListeners() Returns an array of all the input method listeners registered on this component. public InputMethodListener[] getInputMethodListeners() 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: `addInputMethodListener(java.awt.event.InputMethodListener)`, `removeInputMethodListener(java.awt.event.InputMethodListener)`
	getKeyListeners	`KeyListener[]` getKeyListeners() Returns an array of all the key listeners registered on this component. public KeyListener[] getKeyListeners() 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: `addKeyListener(java.awt.event.KeyListener)`, `removeKeyListener(java.awt.event.KeyListener)`
	getMouseListeners	`MouseListener[]` getMouseListeners() Returns an array of all the mouse listeners registered on this component. public MouseListener[] getMouseListeners() 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: `addMouseListener(java.awt.event.MouseListener)`, `removeMouseListener(java.awt.event.MouseListener)`
	getMouseMotionListeners	`MouseMotionListener[]` getMouseMotionListeners() Returns an array of all the mouse motion listeners registered on this component. public MouseMotionListener[] getMouseMotionListeners() 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: `addMouseMotionListener(java.awt.event.MouseMotionListener)`, `removeMouseMotionListener(java.awt.event.MouseMotionListener)`
	getMouseWheelListeners	`MouseWheelListener[]` getMouseWheelListeners() Returns an array of all the mouse wheel listeners registered on this component. public MouseWheelListener[] getMouseWheelListeners() 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: `addMouseWheelListener(java.awt.event.MouseWheelListener)`, `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() 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: `addPropertyChangeListener(java.beans.PropertyChangeListener)`, `removePropertyChangeListener(java.beans.PropertyChangeListener)`, `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) 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: `addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`, `removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`, `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) 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`, `addComponentListener(java.awt.event.ComponentListener)`, `getComponentListeners()`
	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) 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`, `addFocusListener(java.awt.event.FocusListener)`, `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) 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`, `addHierarchyBoundsListener(java.awt.event.HierarchyBoundsListener)`, `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) 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`, `addHierarchyListener(java.awt.event.HierarchyListener)`, `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) 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`, `addInputMethodListener(java.awt.event.InputMethodListener)`, `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) 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`, `addKeyListener(java.awt.event.KeyListener)`, `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) 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`, `addMouseListener(java.awt.event.MouseListener)`, `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) 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`, `addMouseMotionListener(java.awt.event.MouseMotionListener)`, `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) 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`, `addMouseWheelListener(java.awt.event.MouseWheelListener)`, `getMouseWheelListeners()`
	removePropertyChangeListener	`void` removePropertyChangeListener(java.beans.PropertyChangeListener listener) Removes a PropertyChangeListener from the listener list. public void removePropertyChangeListener(java.beans.PropertyChangeListener listener) 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: `addPropertyChangeListener(java.beans.PropertyChangeListener)`, `getPropertyChangeListeners()`, `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) 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: `addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`, `getPropertyChangeListeners(java.lang.String)`, `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 Component.

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 Component.

getFocusTraversalKeysEnabled

boolean getFocusTraversalKeysEnabled()

Returns whether focus traversal keys are enabled for this Component.

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(Container container)

Returns whether the specified Container is the focus cycle root of this Component'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().

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)

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, addFocusListener(java.awt.event.FocusListener), isFocusable(), 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.

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)

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.

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.

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:: requestFocus(), FocusEvent, addFocusListener(java.awt.event.FocusListener), isFocusable(), isDisplayable(), KeyboardFocusManager.clearGlobalFocusOwner()

setFocusable

void setFocusable(boolean focusable)

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

setFocusTraversalKeys

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

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

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

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

The default values for a Component'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

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

Parameters:: id - one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or KeyboardFocusManager.UP_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, or KeyboardFocusManager.UP_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 Component
Since:: 1.4
See Also:: getFocusTraversalKeys(int), KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS

setFocusTraversalKeysEnabled

void setFocusTraversalKeysEnabled(boolean focusTraversalKeysEnabled)

Sets whether focus traversal keys are enabled for this Component.

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.

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) 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: `getFont()`, `getPeer()`, `ComponentPeer.getFontMetrics(Font)`, `Toolkit.getFontMetrics(Font)`
	getGraphics	`Graphics` getGraphics() Creates a graphics context for this component. public Graphics getGraphics() 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: `paint(java.awt.Graphics)`
	getGraphicsConfiguration	`GraphicsConfiguration` getGraphicsConfiguration() Gets the `GraphicsConfiguration` associated with this `Component`. public GraphicsConfiguration getGraphicsConfiguration() 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() 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: `setLocation(int, int)`, `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 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 `Container.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: `isShowing()`, `Container.getMousePosition(boolean)`
	getToolkit	`Toolkit` getToolkit() Gets the toolkit of this component. public Toolkit getToolkit() 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

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) 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: `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) 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: `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) 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) 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: `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) 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`, `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 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) 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) 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) 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) 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: `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) 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: `getComponentAt(Point)`
	doLayout	`void` doLayout() Prompts the layout manager to lay out this component. public void doLayout() Prompts the layout manager to lay out this component. This is usually called when the component (more specifically, container) is validated. See Also: `validate()`, `LayoutManager`
	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.
	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.
	getBaseline	`int` getBaseline(int width, int height) Returns the baseline. public int getBaseline(int width, int height) 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: `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() 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: `getBaseline(int, int)`
	getBounds	`Rectangle` getBounds() Gets the bounds of this component in the form of a `Rectangle` object. public Rectangle getBounds() 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: `setBounds(int, int, int, int)`, `getLocation()`, `getSize()`
	getBounds	`Rectangle` getBounds(Rectangle rv) Stores the bounds of this component into "return value" rv and return rv. public Rectangle getBounds(Rectangle rv) 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) Determines if this component or one of its immediate subcomponents contains the (x, y) location, and if so, returns the containing component. public Component getComponentAt(int x, int y) Determines if this component or one of its immediate subcomponents contains the (x, y) location, and if so, returns the containing component. This method only looks one level deep. If the point (x, y) is inside a subcomponent that itself has subcomponents, it does not go looking down the subcomponent tree. The `locate` method of `Component` simply returns the component itself if the (x, y) coordinate location is inside its bounding box, and `null` otherwise. Parameters: `x` - the x coordinate `y` - the y coordinate Returns: the component or subcomponent that contains the (x, y) location; `null` if the location is outside this component Since: JDK1.0 See Also: `contains(int, int)`
	getComponentAt	`Component` getComponentAt(Point p) Returns the component or subcomponent that contains the specified point. public Component getComponentAt(Point p) Returns the component or subcomponent that contains the specified point. Parameters: `p` - the point Since: JDK1.1 See Also: `contains(int, int)`
	getHeight	`int` getHeight() Returns the current height of this component. public int getHeight() 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
	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() 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: `setLocation(int, int)`, `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) 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() Gets the maximum size of this component. public Dimension getMaximumSize() Gets the maximum size of this component. Returns: a dimension object indicating this component's maximum size See Also: `getMinimumSize()`, `getPreferredSize()`, `LayoutManager`
	getMinimumSize	`Dimension` getMinimumSize() Gets the mininimum size of this component. public Dimension getMinimumSize() Gets the mininimum size of this component. Returns: a dimension object indicating this component's minimum size See Also: `getPreferredSize()`, `LayoutManager`
	getPreferredSize	`Dimension` getPreferredSize() Gets the preferred size of this component. public Dimension getPreferredSize() Gets the preferred size of this component. Returns: a dimension object indicating this component's preferred size See Also: `getMinimumSize()`, `LayoutManager`
	getSize	`Dimension` getSize() Returns the size of this component in the form of a `Dimension` object. public Dimension getSize() 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: `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) 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() 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() 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() 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
	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 this component and its ancestors. public void invalidate() Invalidates this component and its ancestors. By default, all the ancestors of the component up to the top-most container of the hierarchy are marked invalid. If the `java.awt.smartInvalidate` system property is set to `true`, invalidation stops on the nearest validate root of this component. Marking a container invalid indicates that the container needs to be laid out. This method is called automatically when any layout-related information changes (e.g. setting the bounds of the component, or adding the component to a container). This method might be called often, so it should work fast. Since: JDK1.0 See Also: `validate()`, `doLayout()`, `LayoutManager`, `Container.isValidateRoot()`
	isMaximumSizeSet	`boolean` isMaximumSizeSet() Returns true if the maximum size has been set to a non-`null` value otherwise returns false. public boolean isMaximumSizeSet() 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() 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() 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() 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: `validate()`, `invalidate()`
	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() 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 `invalidate()` method on this component, and then calling the `validate()` method on the nearest validate root. Since: 1.7 See Also: `Container.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) 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: `getBounds()`, `setLocation(int, int)`, `setLocation(Point)`, `setSize(int, int)`, `setSize(Dimension)`, `invalidate()`
	setBounds	`void` setBounds(Rectangle r) Moves and resizes this component to conform to the new bounding rectangle `r`. public void setBounds(Rectangle r) 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: `getBounds()`, `setLocation(int, int)`, `setLocation(Point)`, `setSize(int, int)`, `setSize(Dimension)`, `invalidate()`
	setLocation	`void` setLocation(int x, int y) Moves this component to a new location. public void setLocation(int x, int y) 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: `getLocation()`, `setBounds(int, int, int, int)`, `invalidate()`
	setLocation	`void` setLocation(Point p) Moves this component to a new location. public void setLocation(Point p) 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: `getLocation()`, `setBounds(int, int, int, int)`, `invalidate()`
	setMaximumSize	`void` setMaximumSize(Dimension maximumSize) Sets the maximum size of this component to a constant value. public void setMaximumSize(Dimension maximumSize) 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: `getMaximumSize()`, `isMaximumSizeSet()`
	setMinimumSize	`void` setMinimumSize(Dimension minimumSize) Sets the minimum size of this component to a constant value. public void setMinimumSize(Dimension minimumSize) 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: `getMinimumSize()`, `isMinimumSizeSet()`
	setPreferredSize	`void` setPreferredSize(Dimension preferredSize) Sets the preferred size of this component to a constant value. public void setPreferredSize(Dimension preferredSize) 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: `getPreferredSize()`, `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) 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: `setSize(int, int)`, `setBounds(int, int, int, int)`, `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) 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: `getSize()`, `setBounds(int, int, int, int)`, `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 component. public void validate() Validates this component. The meaning of the term validating is defined by the ancestors of this class. See `Container.validate()` for more details. Since: JDK1.0 See Also: `invalidate()`, `doLayout()`, `LayoutManager`, `Container.validate()`

Painting Methods
Modifier and Type	Method and Description
	getIgnoreRepaint	`boolean` getIgnoreRepaint() public boolean getIgnoreRepaint()
	paint	`void` paint(Graphics g) Paints this component. public void paint(Graphics g) Paints this component. This method is called when the contents of the component should be painted; such as when the component is first being shown or is damaged and in need of repair. The clip rectangle in the `Graphics` parameter is set to the area which needs to be painted. Subclasses of `Component` that override this method need not call `super.paint(g)`. For performance reasons, `Component`s with zero width or height aren't considered to need painting when they are first shown, and also aren't considered to need repair. 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: `g` - the graphics context to use for painting Since: JDK1.0 See Also: `update(java.awt.Graphics)`
	paintAll	`void` paintAll(Graphics g) Paints this component and all of its subcomponents. public void paintAll(Graphics g) 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: `paint(java.awt.Graphics)`
	repaint	`void` repaint() Repaints this component. public void repaint() 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: `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) 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: `update(Graphics)`
	repaint	`void` repaint(long tm) Repaints the component. public void repaint(long tm) 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: `paint(java.awt.Graphics)`, `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) 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: `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) 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: `getIgnoreRepaint()`, `Canvas.createBufferStrategy(int)`, `Window.createBufferStrategy(int)`, `BufferStrategy`, `GraphicsDevice.setFullScreenWindow(java.awt.Window)`
	update	`void` update(Graphics g) Updates this component. public void update(Graphics g) Updates this component. If this component is not a lightweight component, the AWT calls the `update` method in response to a call to `repaint`. You can assume that the background is not cleared. The `update` method of `Component` calls this component's `paint` method to redraw this component. This method is commonly overridden by subclasses which need to do additional work in response to a call to `repaint`. Subclasses of Component that override this method should either call `super.update(g)`, or call `paint(g)` directly from their `update` method. 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. 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: `g` - the specified context to use for updating Since: JDK1.0 See Also: `paint(java.awt.Graphics)`, `repaint()`

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() 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) 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 out a list, starting at the specified indentation, to the specified print stream. public void list(java.io.PrintStream out, int indent) Prints out a list, starting at the specified indentation, to the specified print stream. Parameters: `out` - a print stream `indent` - number of spaces to indent Throws: `java.lang.NullPointerException` - if `out` is `null` Since: JDK1.0 See Also: `PrintStream.println(java.lang.Object)`
	list	`void` list(java.io.PrintWriter out) Prints a listing to the specified print writer. public void list(java.io.PrintWriter out) 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. Parameters: `out` - the print writer to print to `indent` - the number of spaces to indent Throws: `java.lang.NullPointerException` - if `out` is `null` Since: JDK1.1 See Also: `PrintStream.println(java.lang.Object)`
	print	`void` print(Graphics g) Prints this component. public void print(Graphics g) Prints this component. Applications should override this method for components that must do special processing before being printed or should be printed differently than they are painted. The default implementation of this method calls the `paint` method. 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: `paint(Graphics)`
	printAll	`void` printAll(Graphics g) Prints this component and all of its subcomponents. public void printAll(Graphics g) 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: `print(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) 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: `remove(MenuComponent)`
	addNotify	`void` addNotify() Makes this `Component` displayable by connecting it to a native screen resource. public void addNotify() Makes this `Component` displayable by connecting it to a native screen resource. This method is called internally by the toolkit and should not be called directly by programs. This method changes layout-related information, and therefore, invalidates the component hierarchy. Since: JDK1.0 See Also: `isDisplayable()`, `removeNotify()`, `invalidate()`
	getDropTarget	`java.awt.dnd.DropTarget` getDropTarget() Gets the `DropTarget` associated with this `Component`. public java.awt.dnd.DropTarget getDropTarget() 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() 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() 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: `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() 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 component. protected java.lang.String paramString() Returns a string representing the state of this component. 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`. Returns: a string representation of this component's state Since: JDK1.0
	remove	`void` remove(MenuComponent popup) Removes the specified popup menu from the component. public void remove(MenuComponent popup) 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: `add(PopupMenu)`
	removeNotify	`void` removeNotify() Makes this `Component` undisplayable by destroying it native screen resource. public void removeNotify() Makes this `Component` undisplayable by destroying it native screen resource. This method is called by the toolkit internally and should not be called directly by programs. Code overriding this method should call `super.removeNotify` as the first line of the overriding method. Since: JDK1.0 See Also: `isDisplayable()`, `addNotify()`
	setDropTarget	`void` setDropTarget(java.awt.dnd.DropTarget dt) Associate a `DropTarget` with this component. public void setDropTarget(java.awt.dnd.DropTarget dt) Associate a `DropTarget` with this component. The `Component` will receive drops only if it is enabled. Parameters: `dt` - The DropTarget See Also: `isEnabled()`
	toString	`java.lang.String` toString() Returns a string representation of this component and its values. public java.lang.String toString() 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 Component

Serialization

Methods inherited from class java.lang.Object