java.awt

Class Component

java.lang.Object
- java.awt.Component

Implemented Interfaces:: ImageObserver, MenuContainer, Serializable

Known Direct Subclasses:: Button, Canvas, Checkbox, Choice, Container, Label, List, Scrollbar, TextComponent

public abstract class Component

extends Object

implements ImageObserver, MenuContainer, Serializable

The root of all evil. All graphical representations are subclasses of this giant class, which is designed for screen display and user interaction. This class can be extended directly to build a lightweight component (one not associated with a native window); lightweight components must reside inside a heavyweight window.

This class is Serializable, which has some big implications. A user can save the state of all graphical components in one VM, and reload them in another. Note that this class will only save Serializable listeners, and ignore the rest, without causing any serialization exceptions. However, by making a listener serializable, and adding it to another element, you link in that entire element to the state of this component. To get around this, use the idiom shown in the example below - make listeners non-serializable in inner classes, rather than using this object itself as the listener, if external objects do not need to save the state of this object.

 import java.awt.*;
 import java.awt.event.*;
 import java.io.Serializable;
 class MyApp implements Serializable
 {
   BigObjectThatShouldNotBeSerializedWithAButton bigOne;
   // Serializing aButton will not suck in an instance of MyApp, with its
   // accompanying field bigOne.
   Button aButton = new Button();
   class MyActionListener implements ActionListener
   {
     public void actionPerformed(ActionEvent e)
     {
       System.out.println("Hello There");
     }
   }
   MyApp()
   {
     aButton.addActionListener(new MyActionListener());
   }
 }

Status: Incomplete. The event dispatch mechanism is implemented. All other methods defined in the J2SE 1.3 API javadoc exist, but are mostly incomplete or only stubs; except for methods relating to the Drag and Drop, Input Method, and Accessibility frameworks: These methods are present but commented out.

Since:: 1.0

See Also:: Serialized Form

Nested Class Summary
`protected abstract class`	`Component.AccessibleAWTComponent` This class provides accessibility support for subclasses of container.
`protected class`	`Component.BltBufferStrategy` This class provides support for blitting offscreen surfaces to a component.
`protected class`	`Component.FlipBufferStrategy` This class provides support for flipping component buffers.

Field Summary
`static float`	`BOTTOM_ALIGNMENT` Constant returned by the `getAlignmentY` method to indicate that the component wishes to be aligned to the bottom relative to other components.
`static float`	`CENTER_ALIGNMENT` Constant returned by the `getAlignmentY` and `getAlignmentX` methods to indicate that the component wishes to be aligned to the center relative to other components.
`static float`	`LEFT_ALIGNMENT` Constant returned by the `getAlignmentX` method to indicate that the component wishes to be aligned to the left relative to other components.
`static float`	`RIGHT_ALIGNMENT` Constant returned by the `getAlignmentX` method to indicate that the component wishes to be aligned to the right relative to other components.
`static float`	`TOP_ALIGNMENT` Constant returned by the `getAlignmentY` method to indicate that the component wishes to be aligned to the top relative to other components.

Fields inherited from interface java.awt.image.ImageObserver
`ABORT`, `ALLBITS`, `ERROR`, `FRAMEBITS`, `HEIGHT`, `PROPERTIES`, `SOMEBITS`, `WIDTH`

Constructor Summary
`Component()` Default constructor for subclasses.

Method Summary
`boolean`	`action(Event evt, Object what)` Deprecated. in classes which support actions, use `processActionEvent(ActionEvent)` instead
`void`	`add(PopupMenu popup)` Adds the specified popup menu to this component.
`void`	`addComponentListener(ComponentListener listener)` Adds the specified listener to this component.
`void`	`addFocusListener(FocusListener listener)` Adds the specified listener to this component.
`void`	`addHierarchyBoundsListener(HierarchyBoundsListener listener)` Adds the specified listener to this component.
`void`	`addHierarchyListener(HierarchyListener listener)` Adds the specified listener to this component.
`void`	`addInputMethodListener(InputMethodListener listener)` Adds the specified listener to this component.
`void`	`addKeyListener(KeyListener listener)` Adds the specified listener to this component.
`void`	`addMouseListener(MouseListener listener)` Adds the specified listener to this component.
`void`	`addMouseMotionListener(MouseMotionListener listener)` Adds the specified listener to this component.
`void`	`addMouseWheelListener(MouseWheelListener listener)` Adds the specified listener to this component.
`void`	`addNotify()` Called when the parent of this Component is made visible or when the Component is added to an already visible Container and needs to be shown.
`void`	`addPropertyChangeListener(PropertyChangeListener listener)` Adds the specified property listener to this component.
`void`	`addPropertyChangeListener(String propertyName, PropertyChangeListener listener)` Adds the specified property listener to this component.
`void`	`applyComponentOrientation(ComponentOrientation o)` Sets the text layout orientation of this component.
`boolean`	`areFocusTraversalKeysSet(int id)` Tests whether the focus traversal keys for a given action are explicitly set or inherited.
`Rectangle`	`bounds()` Deprecated. use `getBounds()` instead
`int`	`checkImage(Image image, int width, int height, ImageObserver observer)` Returns the status of the loading of the specified image.
`int`	`checkImage(Image image, ImageObserver observer)` Returns the status of the loading of the specified image.
`protected AWTEvent`	`coalesceEvents(AWTEvent existingEvent, AWTEvent newEvent)` This is called by the EventQueue if two events with the same event id and owner component are queued.
`boolean`	`contains(int x, int y)` Tests whether or not the specified point is contained within this component.
`boolean`	`contains(Point p)` Tests whether or not the specified point is contained within this component.
`Image`	`createImage(int width, int height)` Creates an image with the specified width and height for use in double buffering.
`Image`	`createImage(ImageProducer producer)` Creates an image from the specified producer.
`VolatileImage`	`createVolatileImage(int width, int height)` Creates an image with the specified width and height for use in double buffering.
`VolatileImage`	`createVolatileImage(int width, int height, ImageCapabilities caps)` Creates an image with the specified width and height for use in double buffering.
`void`	`deliverEvent(Event e)` Deprecated. use `(AWTEvent)` instead
`void`	`disable()` Deprecated. use `setEnabled(boolean)` instead
`protected void`	`disableEvents(long eventsToDisable)` Disables the specified events.
`void`	`dispatchEvent(AWTEvent e)` Forwards AWT events to processEvent() if: Events have been enabled for this type of event via `enableEvents()` There is at least one registered listener for this type of event
`void`	`doLayout()` Calls the layout manager to re-layout the component.
`void`	`enable()` Deprecated. use `setEnabled(boolean)` instead
`void`	`enable(boolean enabled)` Deprecated. use `setEnabled(boolean)` instead
`protected void`	`enableEvents(long eventsToEnable)` Enables the specified events.
`void`	`enableInputMethods(boolean enable)` Enables or disables input method support for this component.
	`extends EventListener> T[] getListeners(Class listenerType)` Returns all registered `EventListener`s of the given `listenerType`.
`protected void`	`firePropertyChange(String propertyName, boolean oldValue, boolean newValue)` Report a change in a bound property to any registered property listeners.
`void`	`firePropertyChange(String propertyName, byte oldValue, byte newValue)` Report a change in a bound property to any registered property listeners.
`void`	`firePropertyChange(String propertyName, char oldValue, char newValue)` Report a change in a bound property to any registered property listeners.
`void`	`firePropertyChange(String propertyName, double oldValue, double newValue)` Report a change in a bound property to any registered property listeners.
`void`	`firePropertyChange(String propertyName, float oldValue, float newValue)` Report a change in a bound property to any registered property listeners.
`protected void`	`firePropertyChange(String propertyName, int oldValue, int newValue)` Report a change in a bound property to any registered property listeners.
`protected void`	`firePropertyChange(String propertyName, Object oldValue, Object newValue)` Report a change in a bound property to any registered property listeners.
`void`	`firePropertyChange(String propertyName, long oldValue, long newValue)` Report a change in a bound property to any registered property listeners.
`void`	`firePropertyChange(String propertyName, short oldValue, short newValue)` Report a change in a bound property to any registered property listeners.
`AccessibleContext`	`getAccessibleContext()` Returns the accessibility framework context of this class.
`float`	`getAlignmentX()` Returns the preferred horizontal alignment of this component.
`float`	`getAlignmentY()` Returns the preferred vertical alignment of this component.
`Color`	`getBackground()` Returns this component's background color.
`Rectangle`	`getBounds()` Returns a bounding rectangle for this component.
`Rectangle`	`getBounds(Rectangle r)` Returns the bounds of this component.
`ColorModel`	`getColorModel()` Returns the color model of the device this componet is displayed on.
`Component`	`getComponentAt(int x, int y)` Returns the component occupying the position (x,y).
`Component`	`getComponentAt(Point p)` Returns the component occupying the position (x,y).
`ComponentListener[]`	`getComponentListeners()` Returns an array of all specified listeners registered on this component.
`ComponentOrientation`	`getComponentOrientation()` Determines the text layout orientation used by this component.
`Cursor`	`getCursor()` Returns the cursor for this component.
`DropTarget`	`getDropTarget()` Gets the associated drag-and-drop target, if there is one.
`Container`	`getFocusCycleRootAncestor()` Returns the root container that owns the focus cycle where this component resides.
`FocusListener[]`	`getFocusListeners()` Returns an array of all specified listeners registered on this component.
`Set`	`getFocusTraversalKeys(int id)` Returns the set of keys for a given focus traversal action, as defined in `setFocusTraversalKeys`.
`boolean`	`getFocusTraversalKeysEnabled()` Check whether or not focus traversal keys are enabled on this Component.
`Font`	`getFont()` Returns the font in use for this component.
`FontMetrics`	`getFontMetrics(Font font)` Returns the font metrics for the specified font in this component.
`Color`	`getForeground()` Returns this component's foreground color.
`Graphics`	`getGraphics()` Returns a graphics object for this component.
`GraphicsConfiguration`	`getGraphicsConfiguration()` Returns the graphics configuration of this component, if there is one.
`int`	`getHeight()` Gets the height of the component.
`HierarchyBoundsListener[]`	`getHierarchyBoundsListeners()` Returns an array of all specified listeners registered on this component.
`HierarchyListener[]`	`getHierarchyListeners()` Returns an array of all specified listeners registered on this component.
`boolean`	`getIgnoreRepaint()` Test whether paint events from the operating system are ignored.
`InputContext`	`getInputContext()` Gets the input context of this component, which is inherited from the parent unless this is overridden.
`InputMethodListener[]`	`getInputMethodListeners()` Returns an array of all specified listeners registered on this component.
`InputMethodRequests`	`getInputMethodRequests()` Returns the input method request handler, for subclasses which support on-the-spot text input.
`KeyListener[]`	`getKeyListeners()` Returns an array of all specified listeners registered on this component.
`Locale`	`getLocale()` Returns the locale for this component.
`Point`	`getLocation()` Returns the location of this component's top left corner relative to its parent component.
`Point`	`getLocation(Point p)` Returns the location of this component.
`Point`	`getLocationOnScreen()` Returns the location of this component's top left corner in screen coordinates.
`Dimension`	`getMaximumSize()` Returns the component's maximum size.
`Dimension`	`getMinimumSize()` Returns the component's minimum size.
`MouseListener[]`	`getMouseListeners()` Returns an array of all specified listeners registered on this component.
`MouseMotionListener[]`	`getMouseMotionListeners()` Returns an array of all specified listeners registered on this component.
`MouseWheelListener[]`	`getMouseWheelListeners()` Returns an array of all specified listeners registered on this component.
`String`	`getName()` Returns the name of this component.
`Container`	`getParent()` Returns the parent of this component.
`ComponentPeer`	`getPeer()` Deprecated. user programs should not directly manipulate peers; use `isDisplayable()` instead
`Dimension`	`getPreferredSize()` Returns the component's preferred size.
`PropertyChangeListener[]`	`getPropertyChangeListeners()` Returns an array of all specified listeners registered on this component.
`PropertyChangeListener[]`	`getPropertyChangeListeners(String property)` Returns an array of all specified listeners on the named property that are registered on this component.
`Dimension`	`getSize()` Returns the size of this object.
`Dimension`	`getSize(Dimension d)` Returns the size of this component.
`Toolkit`	`getToolkit()` Returns the toolkit in use for this component.
`Object`	`getTreeLock()` Returns the object used for synchronization locks on this component when performing tree and layout functions.
`int`	`getWidth()` Gets the width of the component.
`int`	`getX()` Gets the x coordinate of the upper left corner.
`int`	`getY()` Gets the y coordinate of the upper left corner.
`boolean`	`gotFocus(Event evt, Object what)` Deprecated. use `processFocusEvent(FocusEvent)` instead
`boolean`	`handleEvent(Event evt)` Deprecated. use `processEvent(AWTEvent)` instead
`boolean`	`hasFocus()` Tests if this component is the focus owner.
`void`	`hide()` Deprecated. use `setVisible(boolean)` instead
`boolean`	`imageUpdate(Image img, int flags, int x, int y, int w, int h)` Called when an image has changed so that this component is repainted.
`boolean`	`inside(int x, int y)` Deprecated. use `contains(int,int)` instead
`void`	`invalidate()` Invalidates this component and all of its parent components.
`boolean`	`isBackgroundSet()` Tests if the background was explicitly set, or just inherited from the parent.
`boolean`	`isCursorSet()` Tests if the cursor was explicitly set, or just inherited from the parent.
`boolean`	`isDisplayable()` Tests if the component is displayable.
`boolean`	`isDoubleBuffered()` Checks if this image is painted to an offscreen image buffer that is later copied to screen (double buffering reduces flicker).
`boolean`	`isEnabled()` Tests whether or not this component is enabled.
`boolean`	`isFocusCycleRoot(Container c)` Tests if the container is the ancestor of the focus cycle that this component belongs to.
`boolean`	`isFocusOwner()` Tests if this component is the focus owner.
`boolean`	`isFocusTraversable()` Deprecated. use `isFocusable()` instead
`boolean`	`isFocusable()` Tests if this component can receive focus.
`boolean`	`isFontSet()` Tests if the font was explicitly set, or just inherited from the parent.
`boolean`	`isForegroundSet()` Tests if the foreground was explicitly set, or just inherited from the parent.
`boolean`	`isLightweight()` Return whether the component is lightweight.
`boolean`	`isMaximumSizeSet()` Returns `true` if the current maximum size is not `null` and was set by a call to `setMaximumSize(Dimension)`, otherwise returns `false`.
`boolean`	`isMinimumSizeSet()` Returns `true` if the current minimum size is not `null` and was set by a call to `setMinimumSize(Dimension)`, otherwise returns `false`.
`boolean`	`isOpaque()` Tests if this component is opaque.
`boolean`	`isPreferredSizeSet()` Returns `true` if the current preferred size is not `null` and was set by a call to `setPreferredSize(Dimension)`, otherwise returns `false`.
`boolean`	`isShowing()` Tests whether or not this component is actually being shown on the screen.
`boolean`	`isValid()` Tests whether or not this component is valid.
`boolean`	`isVisible()` Tests whether or not this component is visible.
`boolean`	`keyDown(Event evt, int key)` Deprecated. use `processKeyEvent(KeyEvent)` instead
`boolean`	`keyUp(Event evt, int key)` Deprecated. use `processKeyEvent(KeyEvent)` instead
`void`	`layout()` Deprecated. use `doLayout()` instead
`void`	`list()` Prints a listing of this component to `System.out`.
`void`	`list(PrintStream out)` Prints a listing of this component to the specified print stream.
`void`	`list(PrintStream out, int indent)` Prints a listing of this component to the specified print stream, starting at the specified indentation point.
`void`	`list(PrintWriter out)` Prints a listing of this component to the specified print writer.
`void`	`list(PrintWriter out, int indent)` Prints a listing of this component to the specified print writer, starting at the specified indentation point.
`Component`	`locate(int x, int y)` Deprecated. use `getComponentAt(int,int)` instead
`Point`	`location()` Deprecated. use `getLocation()` instead
`boolean`	`lostFocus(Event evt, Object what)` Deprecated. use `processFocusEvent(FocusEvent)` instead
`Dimension`	`minimumSize()` Deprecated. use `getMinimumSize()` instead
`boolean`	`mouseDown(Event evt, int x, int y)` Deprecated. use `processMouseEvent(MouseEvent)` instead
`boolean`	`mouseDrag(Event evt, int x, int y)` Deprecated. use `processMouseMotionEvent(MouseEvent)` instead
`boolean`	`mouseEnter(Event evt, int x, int y)` Deprecated. use `processMouseEvent(MouseEvent)` instead
`boolean`	`mouseExit(Event evt, int x, int y)` Deprecated. use `processMouseEvent(MouseEvent)` instead
`boolean`	`mouseMove(Event evt, int x, int y)` Deprecated. use `processMouseMotionEvent(MouseEvent)` instead
`boolean`	`mouseUp(Event evt, int x, int y)` Deprecated. use `processMouseEvent(MouseEvent)` instead
`void`	`move(int x, int y)` Deprecated. use `setLocation(int,int)` instead
`void`	`nextFocus()` Deprecated. use `()` instead
`void`	`paint(Graphics g)` Paints this component on the screen.
`void`	`paintAll(Graphics g)` Paints this entire component, including any sub-components.
`protected String`	`paramString()` Returns a debugging string representing this component.
`boolean`	`postEvent(Event e)` Deprecated. use `dispatchEvent(AWTEvent)` instead
`Dimension`	`preferredSize()` Deprecated. use `getPreferredSize()` instead
`boolean`	`prepareImage(Image image, int width, int height, ImageObserver observer)` Prepares the specified image for rendering on this component at the specified scaled width and height
`boolean`	`prepareImage(Image image, ImageObserver observer)` Prepares the specified image for rendering on this component.
`void`	`print(Graphics g)` Prints this component.
`void`	`printAll(Graphics g)` Prints this component, including all sub-components.
`protected void`	`processComponentEvent(ComponentEvent e)` Called when a component event is dispatched and component events are enabled.
`protected void`	`processEvent(AWTEvent e)` Processes the specified event.
`protected void`	`processFocusEvent(FocusEvent e)` Called when a focus event is dispatched and component events are enabled.
`protected void`	`processHierarchyBoundsEvent(HierarchyEvent e)` Called when a hierarchy bounds event is dispatched and component events are enabled.
`protected void`	`processHierarchyEvent(HierarchyEvent e)` Called when a hierarchy change event is dispatched and component events are enabled.
`protected void`	`processInputMethodEvent(InputMethodEvent e)` Called when an input method event is dispatched and component events are enabled.
`protected void`	`processKeyEvent(KeyEvent e)` Called when a key event is dispatched and component events are enabled.
`protected void`	`processMouseEvent(MouseEvent e)` Called when a regular mouse event is dispatched and component events are enabled.
`protected void`	`processMouseMotionEvent(MouseEvent e)` Called when a mouse motion event is dispatched and component events are enabled.
`protected void`	`processMouseWheelEvent(MouseWheelEvent e)` Called when a mouse wheel event is dispatched and component events are enabled.
`void`	`remove(MenuComponent popup)` Removes the specified popup menu from this component.
`void`	`removeComponentListener(ComponentListener listener)` Removes the specified listener from the component.
`void`	`removeFocusListener(FocusListener listener)` Removes the specified listener from the component.
`void`	`removeHierarchyBoundsListener(HierarchyBoundsListener listener)` Removes the specified listener from the component.
`void`	`removeHierarchyListener(HierarchyListener listener)` Removes the specified listener from the component.
`void`	`removeInputMethodListener(InputMethodListener listener)` Removes the specified listener from the component.
`void`	`removeKeyListener(KeyListener listener)` Removes the specified listener from the component.
`void`	`removeMouseListener(MouseListener listener)` Removes the specified listener from the component.
`void`	`removeMouseMotionListener(MouseMotionListener listener)` Removes the specified listener from the component.
`void`	`removeMouseWheelListener(MouseWheelListener listener)` Removes the specified listener from the component.
`void`	`removeNotify()` Called to inform this component is has been removed from its container.
`void`	`removePropertyChangeListener(PropertyChangeListener listener)` Removes the specified property listener from the component.
`void`	`removePropertyChangeListener(String propertyName, PropertyChangeListener listener)` Removes the specified property listener on a particular property from the component.
`void`	`repaint()` Repaint this entire component.
`void`	`repaint(int x, int y, int w, int h)` Repaints the specified rectangular region within this component.
`void`	`repaint(long tm)` Repaint this entire component.
`void`	`repaint(long tm, int x, int y, int width, int height)` Repaints the specified rectangular region within this component.
`void`	`requestFocus()` Request that this Component be given the keyboard input focus and that its top-level ancestor become the focused Window.
`protected boolean`	`requestFocus(boolean temporary)` Request that this Component be given the keyboard input focus and that its top-level ancestor become the focused Window.
`boolean`	`requestFocusInWindow()` Request that this component be given the keyboard input focus, if its top-level ancestor is the currently focused Window.
`protected boolean`	`requestFocusInWindow(boolean temporary)` Request that this component be given the keyboard input focus, if its top-level ancestor is the currently focused Window.
`void`	`reshape(int x, int y, int width, int height)` Deprecated. use `setBounds(int,int,int,int)` instead
`void`	`resize(int width, int height)` Deprecated. use `setSize(int,int)` instead
`void`	`resize(Dimension d)` Deprecated. use `setSize(Dimension)` instead
`void`	`setBackground(Color c)` Sets this component's background color to the specified color.
`void`	`setBounds(int x, int y, int w, int h)` Sets the bounding rectangle for this component to the specified values.
`void`	`setBounds(Rectangle r)` Sets the bounding rectangle for this component to the specified rectangle.
`void`	`setComponentOrientation(ComponentOrientation o)` Sets the text layout orientation of this component.
`void`	`setCursor(Cursor cursor)` Sets the cursor for this component to the specified cursor.
`void`	`setDropTarget(DropTarget dt)` Set the associated drag-and-drop target, which receives events when this is enabled.
`void`	`setEnabled(boolean enabled)` Enables or disables this component.
`void`	`setFocusTraversalKeys(int id, AWTKeyStroke> keystrokes)` Sets the focus traversal keys for one of the three focus traversal directions supported by Components: `KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS`, `KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS`, or `KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS`.
`void`	`setFocusTraversalKeysEnabled(boolean focusTraversalKeysEnabled)` Enable or disable focus traversal keys on this Component.
`void`	`setFocusable(boolean focusable)` Specify whether this component can receive focus.
`void`	`setFont(Font f)` Sets the font for this component to the specified font.
`void`	`setForeground(Color c)` Sets this component's foreground color to the specified color.
`void`	`setIgnoreRepaint(boolean ignoreRepaint)` Sets whether paint messages delivered by the operating system should be ignored.
`void`	`setLocale(Locale newLocale)` Sets the locale for this component to the specified locale.
`void`	`setLocation(int x, int y)` Moves this component to the specified location, relative to the parent's coordinates.
`void`	`setLocation(Point p)` Moves this component to the specified location, relative to the parent's coordinates.
`void`	`setMaximumSize(Dimension size)` Sets the maximum size that will be returned by `getMaximumSize()` always, and sends a `PropertyChangeEvent` (with the property name 'maximumSize') to all registered listeners.
`void`	`setMinimumSize(Dimension size)` Sets the minimum size that will be returned by `getMinimumSize()` always, and sends a `PropertyChangeEvent` (with the property name 'minimumSize') to all registered listeners.
`void`	`setName(String name)` Sets the name of this component to the specified name (this is a bound property with the name 'name').
`void`	`setPreferredSize(Dimension size)` Sets the preferred size that will be returned by `getPreferredSize()` always, and sends a `PropertyChangeEvent` (with the property name 'preferredSize') to all registered listeners.
`void`	`setSize(int width, int height)` Sets the size of this component to the specified width and height.
`void`	`setSize(Dimension d)` Sets the size of this component to the specified value.
`void`	`setVisible(boolean visible)` Makes this component visible or invisible.
`void`	`show()` Deprecated. use `setVisible(boolean)` instead
`void`	`show(boolean visible)` Deprecated. use `setVisible(boolean)` instead
`Dimension`	`size()` Deprecated. use `getSize()` instead
`String`	`toString()` Returns a string representation of this component.
`void`	`transferFocus()` Transfers focus to the next component in the focus traversal order, as though this were the current focus owner.
`void`	`transferFocusBackward()` Transfers focus to the previous component in the focus traversal order, as though this were the current focus owner.
`void`	`transferFocusUpCycle()` Transfers focus to the focus cycle root of this component.
`void`	`update(Graphics g)` Updates this component.
`void`	`validate()` Called to ensure that the layout for this component is valid.

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

BOTTOM_ALIGNMENT

public static final float BOTTOM_ALIGNMENT

Constant returned by the getAlignmentY method to indicate that the component wishes to be aligned to the bottom relative to other components.
Field Value:
1.0f
See Also:
getAlignmentY()

CENTER_ALIGNMENT

public static final float CENTER_ALIGNMENT

Constant returned by the getAlignmentY and getAlignmentX methods to indicate that the component wishes to be aligned to the center relative to other components.
Field Value:
0.0f
See Also:
getAlignmentX(), getAlignmentY()

LEFT_ALIGNMENT

public static final float LEFT_ALIGNMENT

Constant returned by the getAlignmentX method to indicate that the component wishes to be aligned to the left relative to other components.
Field Value:
0.0f
See Also:
getAlignmentX()

RIGHT_ALIGNMENT

public static final float RIGHT_ALIGNMENT

Constant returned by the getAlignmentX method to indicate that the component wishes to be aligned to the right relative to other components.
Field Value:
1.0f
See Also:
getAlignmentX()

TOP_ALIGNMENT

public static final float TOP_ALIGNMENT

Constant returned by the getAlignmentY method to indicate that the component wishes to be aligned to the top relative to other components.
Field Value:
0.0f
See Also:
getAlignmentY()

Component

protected Component()

Default constructor for subclasses. When Component is extended directly, it forms a lightweight component that must be hosted in an opaque native container higher in the tree.

action

public boolean action(Event evt,
                      Object what)

Deprecated. in classes which support actions, use processActionEvent(ActionEvent) instead
AWT 1.0 ACTION_EVENT event handler. This method is meant to be overridden by components providing their own action event handler. The default implementation simply returns false.
Parameters:
evt - the event to handle
what - the object acted on, ignored
Returns:
false

add

public void add(PopupMenu popup)

Adds the specified popup menu to this component.
Parameters:
popup - the popup menu to be added
Since:
1.1
See Also:
remove(MenuComponent)

addComponentListener

public void addComponentListener(ComponentListener listener)

Adds the specified listener to this component. This is harmless if the listener is null, but if the listener has already been registered, it will now be registered twice.
Parameters:
listener - the new listener to add
Since:
1.1
See Also:
ComponentEvent, removeComponentListener(ComponentListener), getComponentListeners()

addFocusListener

public void addFocusListener(FocusListener listener)

Adds the specified listener to this component. This is harmless if the listener is null, but if the listener has already been registered, it will now be registered twice.
Parameters:
listener - the new listener to add
Since:
1.1
See Also:
FocusEvent, removeFocusListener(FocusListener), getFocusListeners()

addHierarchyBoundsListener

public void addHierarchyBoundsListener(HierarchyBoundsListener listener)

Adds the specified listener to this component. This is harmless if the listener is null, but if the listener has already been registered, it will now be registered twice.
Parameters:
listener - the new listener to add
Since:
1.3
See Also:
HierarchyEvent, removeHierarchyBoundsListener(HierarchyBoundsListener), getHierarchyBoundsListeners()

addHierarchyListener

public void addHierarchyListener(

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java.awt

Class Component

Nested Class Summary

Field Summary

Fields inherited from interface java.awt.image.ImageObserver

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Details