java.lang.Object
- java.awt.AWTEventMulticaster

All Implemented Interfaces:

ActionListener, AdjustmentListener, ComponentListener, ContainerListener, FocusListener, HierarchyBoundsListener, HierarchyListener, InputMethodListener, ItemListener, KeyListener, MouseListener, MouseMotionListener, MouseWheelListener, TextListener, WindowFocusListener, WindowListener, WindowStateListener, EventListener
```
public class AWTEventMulticaster
extends Object
implements ComponentListener, ContainerListener, FocusListener, KeyListener, MouseListener, MouseMotionListener, WindowListener, WindowFocusListener, WindowStateListener, ActionListener, ItemListener, AdjustmentListener, TextListener, InputMethodListener, HierarchyListener, HierarchyBoundsListener, MouseWheelListener
```
AWTEventMulticaster implements efficient and thread-safe multi-cast event dispatching for the AWT events defined in the java.awt.event package.
The following example illustrates how to use this class:
```
 public myComponent extends Component {
     ActionListener actionListener = null;

     public synchronized void addActionListener(ActionListener l) {
         actionListener = AWTEventMulticaster.add(actionListener, l);
     }
     public synchronized void removeActionListener(ActionListener l) {
         actionListener = AWTEventMulticaster.remove(actionListener, l);
     }
     public void processEvent(AWTEvent e) {
         // when event occurs which causes "action" semantic
         ActionListener listener = actionListener;
         if (listener != null) {
             listener.actionPerformed(new ActionEvent());
         }
     }
 }
 
```
The important point to note is the first argument to the add and remove methods is the field maintaining the listeners. In addition you must assign the result of the add and remove methods to the field maintaining the listeners.
AWTEventMulticaster is implemented as a pair of EventListeners that are set at construction time. AWTEventMulticaster is immutable. The add and remove methods do not alter AWTEventMulticaster in anyway. If necessary, a new AWTEventMulticaster is created. In this way it is safe to add and remove listeners during the process of an event dispatching. However, event listeners added during the process of an event dispatch operation are not notified of the event currently being dispatched.
All of the add methods allow null arguments. If the first argument is null, the second argument is returned. If the first argument is not null and the second argument is null, the first argument is returned. If both arguments are non-null, a new AWTEventMulticaster is created using the two arguments and returned.
For the remove methods that take two arguments, the following is returned:
- null, if the first argument is null, or the arguments are equal, by way of ==.
- the first argument, if the first argument is not an instance of AWTEventMulticaster.
- result of invoking remove(EventListener) on the first argument, supplying the second argument to the remove(EventListener) method.
Swing makes use of EventListenerList for similar logic. Refer to it for details.
Since:

1.1

See Also:

EventListenerList

Field Summary

Fields
Modifier and Type Field Description

protected EventListener a
A variable in the event chain (listener-a)

protected EventListener b
A variable in the event chain (listener-b)

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`AWTEventMulticaster(EventListener a, EventListener b)`	Creates an event multicaster instance which chains listener-a with listener-b.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`actionPerformed(ActionEvent e)`	Handles the actionPerformed event by invoking the actionPerformed methods on listener-a and listener-b.
`static ActionListener`	`add(ActionListener a, ActionListener b)`	Adds action-listener-a with action-listener-b and returns the resulting multicast listener.
`static AdjustmentListener`	`add(AdjustmentListener a, AdjustmentListener b)`	Adds adjustment-listener-a with adjustment-listener-b and returns the resulting multicast listener.
`static ComponentListener`	`add(ComponentListener a, ComponentListener b)`	Adds component-listener-a with component-listener-b and returns the resulting multicast listener.
`static ContainerListener`	`add(ContainerListener a, ContainerListener b)`	Adds container-listener-a with container-listener-b and returns the resulting multicast listener.
`static FocusListener`	`add(FocusListener a, FocusListener b)`	Adds focus-listener-a with focus-listener-b and returns the resulting multicast listener.
`static HierarchyBoundsListener`	`add(HierarchyBoundsListener a, HierarchyBoundsListener b)`	Adds hierarchy-bounds-listener-a with hierarchy-bounds-listener-b and returns the resulting multicast listener.
`static HierarchyListener`	`add(HierarchyListener a, HierarchyListener b)`	Adds hierarchy-listener-a with hierarchy-listener-b and returns the resulting multicast listener.
`static InputMethodListener`	`add(InputMethodListener a, InputMethodListener b)`	Adds input-method-listener-a with input-method-listener-b and returns the resulting multicast listener.
`static ItemListener`	`add(ItemListener a, ItemListener b)`	Adds item-listener-a with item-listener-b and returns the resulting multicast listener.
`static KeyListener`	`add(KeyListener a, KeyListener b)`	Adds key-listener-a with key-listener-b and returns the resulting multicast listener.
`static MouseListener`	`add(MouseListener a, MouseListener b)`	Adds mouse-listener-a with mouse-listener-b and returns the resulting multicast listener.
`static MouseMotionListener`	`add(MouseMotionListener a, MouseMotionListener b)`	Adds mouse-motion-listener-a with mouse-motion-listener-b and returns the resulting multicast listener.
`static MouseWheelListener`	`add(MouseWheelListener a, MouseWheelListener b)`	Adds mouse-wheel-listener-a with mouse-wheel-listener-b and returns the resulting multicast listener.
`static TextListener`	`add(TextListener a, TextListener b)`	Adds text-listener-a with text-listener-b and returns the resulting multicast listener.
`static WindowFocusListener`	`add(WindowFocusListener a, WindowFocusListener b)`	Adds window-focus-listener-a with window-focus-listener-b and returns the resulting multicast listener.
`static WindowListener`	`add(WindowListener a, WindowListener b)`	Adds window-listener-a with window-listener-b and returns the resulting multicast listener.
`static WindowStateListener`	`add(WindowStateListener a, WindowStateListener b)`	Adds window-state-listener-a with window-state-listener-b and returns the resulting multicast listener.
`protected static EventListener`	`addInternal(EventListener a, EventListener b)`	Returns the resulting multicast listener from adding listener-a and listener-b together.
`void`	`adjustmentValueChanged(AdjustmentEvent e)`	Handles the adjustmentValueChanged event by invoking the adjustmentValueChanged methods on listener-a and listener-b.
`void`	`ancestorMoved(HierarchyEvent e)`	Handles the ancestorMoved event by invoking the ancestorMoved methods on listener-a and listener-b.
`void`	`ancestorResized(HierarchyEvent e)`	Handles the ancestorResized event by invoking the ancestorResized methods on listener-a and listener-b.
`void`	`caretPositionChanged(InputMethodEvent e)`	Handles the caretPositionChanged event by invoking the caretPositionChanged methods on listener-a and listener-b.
`void`	`componentAdded(ContainerEvent e)`	Handles the componentAdded container event by invoking the componentAdded methods on listener-a and listener-b.
`void`	`componentHidden(ComponentEvent e)`	Handles the componentHidden event by invoking the componentHidden methods on listener-a and listener-b.
`void`	`componentMoved(ComponentEvent e)`	Handles the componentMoved event by invoking the componentMoved methods on listener-a and listener-b.
`void`	`componentRemoved(ContainerEvent e)`	Handles the componentRemoved container event by invoking the componentRemoved methods on listener-a and listener-b.
`void`	`componentResized(ComponentEvent e)`	Handles the componentResized event by invoking the componentResized methods on listener-a and listener-b.
`void`	`componentShown(ComponentEvent e)`	Handles the componentShown event by invoking the componentShown methods on listener-a and listener-b.
`void`	`focusGained(FocusEvent e)`	Handles the focusGained event by invoking the focusGained methods on listener-a and listener-b.
`void`	`focusLost(FocusEvent e)`	Handles the focusLost event by invoking the focusLost methods on listener-a and listener-b.
`static <T extends EventListener> T[]`	`getListeners(EventListener l, Class<T> listenerType)`	Returns an array of all the objects chained as `FooListener`s by the specified `java.util.EventListener`.
`void`	`hierarchyChanged(HierarchyEvent e)`	Handles the hierarchyChanged event by invoking the hierarchyChanged methods on listener-a and listener-b.
`void`	`inputMethodTextChanged(InputMethodEvent e)`	Handles the inputMethodTextChanged event by invoking the inputMethodTextChanged methods on listener-a and listener-b.
`void`	`itemStateChanged(ItemEvent e)`	Handles the itemStateChanged event by invoking the itemStateChanged methods on listener-a and listener-b.
`void`	`keyPressed(KeyEvent e)`	Handles the keyPressed event by invoking the keyPressed methods on listener-a and listener-b.
`void`	`keyReleased(KeyEvent e)`	Handles the keyReleased event by invoking the keyReleased methods on listener-a and listener-b.
`void`	`keyTyped(KeyEvent e)`	Handles the keyTyped event by invoking the keyTyped methods on listener-a and listener-b.
`void`	`mouseClicked(MouseEvent e)`	Handles the mouseClicked event by invoking the mouseClicked methods on listener-a and listener-b.
`void`	`mouseDragged(MouseEvent e)`	Handles the mouseDragged event by invoking the mouseDragged methods on listener-a and listener-b.
`void`	`mouseEntered(MouseEvent e)`	Handles the mouseEntered event by invoking the mouseEntered methods on listener-a and listener-b.
`void`	`mouseExited(MouseEvent e)`	Handles the mouseExited event by invoking the mouseExited methods on listener-a and listener-b.
`void`	`mouseMoved(MouseEvent e)`	Handles the mouseMoved event by invoking the mouseMoved methods on listener-a and listener-b.
`void`	`mousePressed(MouseEvent e)`	Handles the mousePressed event by invoking the mousePressed methods on listener-a and listener-b.
`void`	`mouseReleased(MouseEvent e)`	Handles the mouseReleased event by invoking the mouseReleased methods on listener-a and listener-b.
`void`	`mouseWheelMoved(MouseWheelEvent e)`	Handles the mouseWheelMoved event by invoking the mouseWheelMoved methods on listener-a and listener-b.
`static ActionListener`	`remove(ActionListener l, ActionListener oldl)`	Removes the old action-listener from action-listener-l and returns the resulting multicast listener.
`static AdjustmentListener`	`remove(AdjustmentListener l, AdjustmentListener oldl)`	Removes the old adjustment-listener from adjustment-listener-l and returns the resulting multicast listener.
`static ComponentListener`	`remove(ComponentListener l, ComponentListener oldl)`	Removes the old component-listener from component-listener-l and returns the resulting multicast listener.
`static ContainerListener`	`remove(ContainerListener l, ContainerListener oldl)`	Removes the old container-listener from container-listener-l and returns the resulting multicast listener.
`static FocusListener`	`remove(FocusListener l, FocusListener oldl)`	Removes the old focus-listener from focus-listener-l and returns the resulting multicast listener.
`static HierarchyBoundsListener`	`remove(HierarchyBoundsListener l, HierarchyBoundsListener oldl)`	Removes the old hierarchy-bounds-listener from hierarchy-bounds-listener-l and returns the resulting multicast listener.
`static HierarchyListener`	`remove(HierarchyListener l, HierarchyListener oldl)`	Removes the old hierarchy-listener from hierarchy-listener-l and returns the resulting multicast listener.
`static InputMethodListener`	`remove(InputMethodListener l, InputMethodListener oldl)`	Removes the old input-method-listener from input-method-listener-l and returns the resulting multicast listener.
`static ItemListener`	`remove(ItemListener l, ItemListener oldl)`	Removes the old item-listener from item-listener-l and returns the resulting multicast listener.
`static KeyListener`	`remove(KeyListener l, KeyListener oldl)`	Removes the old key-listener from key-listener-l and returns the resulting multicast listener.
`static MouseListener`	`remove(MouseListener l, MouseListener oldl)`	Removes the old mouse-listener from mouse-listener-l and returns the resulting multicast listener.
`static MouseMotionListener`	`remove(MouseMotionListener l, MouseMotionListener oldl)`	Removes the old mouse-motion-listener from mouse-motion-listener-l and returns the resulting multicast listener.
`static MouseWheelListener`	`remove(MouseWheelListener l, MouseWheelListener oldl)`	Removes the old mouse-wheel-listener from mouse-wheel-listener-l and returns the resulting multicast listener.
`static TextListener`	`remove(TextListener l, TextListener oldl)`	Removes the old text-listener from text-listener-l and returns the resulting multicast listener.
`static WindowFocusListener`	`remove(WindowFocusListener l, WindowFocusListener oldl)`	Removes the old window-focus-listener from window-focus-listener-l and returns the resulting multicast listener.
`static WindowListener`	`remove(WindowListener l, WindowListener oldl)`	Removes the old window-listener from window-listener-l and returns the resulting multicast listener.
`static WindowStateListener`	`remove(WindowStateListener l, WindowStateListener oldl)`	Removes the old window-state-listener from window-state-listener-l and returns the resulting multicast listener.
`protected EventListener`	`remove(EventListener oldl)`	Removes a listener from this multicaster.
`protected static EventListener`	`removeInternal(EventListener l, EventListener oldl)`	Returns the resulting multicast listener after removing the old listener from listener-l.
`protected static void`	`save(ObjectOutputStream s, String k, EventListener l)`	Saves a Serializable listener chain to a serialization stream.
`protected void`	`saveInternal(ObjectOutputStream s, String k)`	Serialization support.
`void`	`textValueChanged(TextEvent e)`	Invoked when the value of the text has changed.
`void`	`windowActivated(WindowEvent e)`	Handles the windowActivated event by invoking the windowActivated methods on listener-a and listener-b.
`void`	`windowClosed(WindowEvent e)`	Handles the windowClosed event by invoking the windowClosed methods on listener-a and listener-b.
`void`	`windowClosing(WindowEvent e)`	Handles the windowClosing event by invoking the windowClosing methods on listener-a and listener-b.
`void`	`windowDeactivated(WindowEvent e)`	Handles the windowDeactivated event by invoking the windowDeactivated methods on listener-a and listener-b.
`void`	`windowDeiconified(WindowEvent e)`	Handles the windowDeiconified event by invoking the windowDeiconified methods on listener-a and listener-b.
`void`	`windowGainedFocus(WindowEvent e)`	Handles the windowGainedFocus event by invoking the windowGainedFocus methods on listener-a and listener-b.
`void`	`windowIconified(WindowEvent e)`	Handles the windowIconified event by invoking the windowIconified methods on listener-a and listener-b.
`void`	`windowLostFocus(WindowEvent e)`	Handles the windowLostFocus event by invoking the windowLostFocus methods on listener-a and listener-b.
`void`	`windowOpened(WindowEvent e)`	Handles the windowOpened event by invoking the windowOpened methods on listener-a and listener-b.
`void`	`windowStateChanged(WindowEvent e)`	Handles the windowStateChanged event by invoking the windowStateChanged methods on listener-a and listener-b.

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

- Field Detail
  - a
```
protected final EventListener a
```
    A variable in the event chain (listener-a)
  - b
```
protected final EventListener b
```
    A variable in the event chain (listener-b)
- Constructor Detail
  - AWTEventMulticaster
```
protected AWTEventMulticaster(EventListener a,
                              EventListener b)
```
    Creates an event multicaster instance which chains listener-a with listener-b. Input parameters a and b should not be null, though implementations may vary in choosing whether or not to throw NullPointerException in that case.
    
    Parameters:
    
    a - listener-a
    
    b - listener-b
- Method Detail
  - remove
```
protected EventListener remove(EventListener oldl)
```
    Removes a listener from this multicaster.
    The returned multicaster contains all the listeners in this multicaster with the exception of all occurrences of oldl. If the resulting multicaster contains only one regular listener the regular listener may be returned. If the resulting multicaster is empty, then null may be returned instead.
    No exception is thrown if oldl is null.
    
    Parameters:
    
    oldl - the listener to be removed
    
    Returns:
    
    resulting listener
  - componentResized
```
public void componentResized(ComponentEvent e)
```
    Handles the componentResized event by invoking the componentResized methods on listener-a and listener-b.
    
    Specified by:
    
    componentResized in interface ComponentListener
    
    Parameters:
    
    e - the component event
  - componentMoved
```
public void componentMoved(ComponentEvent e)
```
    Handles the componentMoved event by invoking the componentMoved methods on listener-a and listener-b.
    
    Specified by:
    
    componentMoved in interface ComponentListener
    
    Parameters:
    
    e - the component event
  - componentShown
```
public void componentShown(ComponentEvent e)
```
    Handles the componentShown event by invoking the componentShown methods on listener-a and listener-b.
    
    Specified by:
    
    componentShown in interface ComponentListener
    
    Parameters:
    
    e - the component event
  - componentHidden
```
public void componentHidden(ComponentEvent e)
```
    Handles the componentHidden event by invoking the componentHidden methods on listener-a and listener-b.
    
    Specified by:
    
    componentHidden in interface ComponentListener
    
    Parameters:
    
    e - the component event
  - componentAdded
```
public void componentAdded(ContainerEvent e)
```
    Handles the componentAdded container event by invoking the componentAdded methods on listener-a and listener-b.
    
    Specified by:
    
    componentAdded in interface ContainerListener
    
    Parameters:
    
    e - the component event
  - componentRemoved
```
public void componentRemoved(ContainerEvent e)
```
    Handles the componentRemoved container event by invoking the componentRemoved methods on listener-a and listener-b.
    
    Specified by:
    
    componentRemoved in interface ContainerListener
    
    Parameters:
    
    e - the component event
  - focusGained
```
public void focusGained(FocusEvent e)
```
    Handles the focusGained event by invoking the focusGained methods on listener-a and listener-b.
    
    Specified by:
    
    focusGained in interface FocusListener
    
    Parameters:
    
    e - the focus event
  - focusLost
```
public void focusLost(FocusEvent e)
```
    Handles the focusLost event by invoking the focusLost methods on listener-a and listener-b.
    
    Specified by:
    
    focusLost in interface FocusListener
    
    Parameters:
    
    e - the focus event
  - keyTyped
```
public void keyTyped(KeyEvent e)
```
    Handles the keyTyped event by invoking the keyTyped methods on listener-a and listener-b.
    
    Specified by:
    
    keyTyped in interface KeyListener
    
    Parameters:
    
    e - the key event
  - keyPressed
```
public void keyPressed(KeyEvent e)
```
    Handles the keyPressed event by invoking the keyPressed methods on listener-a and listener-b.
    
    Specified by:
    
    keyPressed in interface KeyListener
    
    Parameters:
    
    e - the key event
  - keyReleased
```
public void keyReleased(KeyEvent e)
```
    Handles the keyReleased event by invoking the keyReleased methods on listener-a and listener-b.
    
    Specified by:
    
    keyReleased in interface KeyListener
    
    Parameters:
    
    e - the key event
  - mouseClicked
```
public void mouseClicked(MouseEvent e)
```
    Handles the mouseClicked event by invoking the mouseClicked methods on listener-a and listener-b.
    
    Specified by:
    
    mouseClicked in interface MouseListener
    
    Parameters:
    
    e - the mouse event
  - mousePressed
```
public void mousePressed(MouseEvent e)
```
    Handles the mousePressed event by invoking the mousePressed methods on listener-a and listener-b.
    
    Specified by:
    
    mousePressed in interface MouseListener
    
    Parameters:
    
    e - the mouse event
  - mouseReleased
```
public void mouseReleased(MouseEvent e)
```
    Handles the mouseReleased event by invoking the mouseReleased methods on listener-a and listener-b.
    
    Specified by:
    
    mouseReleased in interface MouseListener
    
    Parameters:
    
    e - the mouse event
  - mouseEntered
```
public void mouseEntered(MouseEvent e)
```
    Handles the mouseEntered event by invoking the mouseEntered methods on listener-a and listener-b.
    
    Specified by:
    
    mouseEntered in interface MouseListener
    
    Parameters:
    
    e - the mouse event
  - mouseExited
```
public void mouseExited(MouseEvent e)
```
    Handles the mouseExited event by invoking the mouseExited methods on listener-a and listener-b.
    
    Specified by:
    
    mouseExited in interface MouseListener
    
    Parameters:
    
    e - the mouse event
  - mouseDragged
```
public void mouseDragged(MouseEvent e)
```
    Handles the mouseDragged event by invoking the mouseDragged methods on listener-a and listener-b.
    
    Specified by:
    
    mouseDragged in interface MouseMotionListener
    
    Parameters:
    
    e - the mouse event
  - mouseMoved
```
public void mouseMoved(MouseEvent e)
```
    Handles the mouseMoved event by invoking the mouseMoved methods on listener-a and listener-b.
    
    Specified by:
    
    mouseMoved in interface MouseMotionListener
    
    Parameters:
    
    e - the mouse event
  - windowOpened
```
public void windowOpened(WindowEvent e)
```
    Handles the windowOpened event by invoking the windowOpened methods on listener-a and listener-b.
    
    Specified by:
    
    windowOpened in interface WindowListener
    
    Parameters:
    
    e - the window event
  - windowClosing
```
public void windowClosing(WindowEvent e)
```
    Handles the windowClosing event by invoking the windowClosing methods on listener-a and listener-b.
    
    Specified by:
    
    windowClosing in interface WindowListener
    
    Parameters:
    
    e - the window event
  - windowClosed
```
public void windowClosed(WindowEvent e)
```
    Handles the windowClosed event by invoking the windowClosed methods on listener-a and listener-b.
    
    Specified by:
    
    windowClosed in interface WindowListener
    
    Parameters:
    
    e - the window event
  - windowIconified
```
public void windowIconified(WindowEvent e)
```
    Handles the windowIconified event by invoking the windowIconified methods on listener-a and listener-b.
    
    Specified by:
    
    windowIconified in interface WindowListener
    
    Parameters:
    
    e - the window event
    
    See Also:
    
    Frame.setIconImage(java.awt.Image)
  - windowDeiconified
```
public void windowDeiconified(WindowEvent e)
```
    Handles the windowDeiconified event by invoking the windowDeiconified methods on listener-a and listener-b.
    
    Specified by:
    
    windowDeiconified in interface WindowListener
    
    Parameters:
    
    e - the window event
  - windowActivated
```
public void windowActivated(WindowEvent e)
```
    Handles the windowActivated event by invoking the windowActivated methods on listener-a and listener-b.
    
    Specified by:
    
    windowActivated in interface WindowListener
    
    Parameters:
    
    e - the window event
  - windowDeactivated
```
public void windowDeactivated(WindowEvent e)
```
    Handles the windowDeactivated event by invoking the windowDeactivated methods on listener-a and listener-b.
    
    Specified by:
    
    windowDeactivated in interface WindowListener
    
    Parameters:
    
    e - the window event
  - windowStateChanged
```
public void windowStateChanged(WindowEvent e)
```
    Handles the windowStateChanged event by invoking the windowStateChanged methods on listener-a and listener-b.
    
    Specified by:
    
    windowStateChanged in interface WindowStateListener
    
    Parameters:
    
    e - the window event
    
    Since:
    
    1.4
  - windowGainedFocus
```
public void windowGainedFocus(WindowEvent e)
```
    Handles the windowGainedFocus event by invoking the windowGainedFocus methods on listener-a and listener-b.
    
    Specified by:
    
    windowGainedFocus in interface WindowFocusListener
    
    Parameters:
    
    e - the window event
    
    Since:
    
    1.4
  - windowLostFocus
```
public void windowLostFocus(WindowEvent e)
```
    Handles the windowLostFocus event by invoking the windowLostFocus methods on listener-a and listener-b.
    
    Specified by:
    
    windowLostFocus in interface WindowFocusListener
    
    Parameters:
    
    e - the window event
    
    Since:
    
    1.4
  - actionPerformed
```
public void actionPerformed(ActionEvent e)
```
    Handles the actionPerformed event by invoking the actionPerformed methods on listener-a and listener-b.
    
    Specified by:
    
    actionPerformed in interface ActionListener
    
    Parameters:
    
    e - the action event
  - itemStateChanged
```
public void itemStateChanged(ItemEvent e)
```
    Handles the itemStateChanged event by invoking the itemStateChanged methods on listener-a and listener-b.
    
    Specified by:
    
    itemStateChanged in interface ItemListener
    
    Parameters:
    
    e - the item event
  - adjustmentValueChanged
```
public void adjustmentValueChanged(AdjustmentEvent e)
```
    Handles the adjustmentValueChanged event by invoking the adjustmentValueChanged methods on listener-a and listener-b.
    
    Specified by:
    
    adjustmentValueChanged in interface AdjustmentListener
    
    Parameters:
    
    e - the adjustment event
  - textValueChanged
```
public void textValueChanged(TextEvent e)
```
    Description copied from interface: TextListener
    
    Invoked when the value of the text has changed. The code written for this method performs the operations that need to occur when text changes.
    
    Specified by:
    
    textValueChanged in interface TextListener
    
    Parameters:
    
    e - the event to be processed
  - inputMethodTextChanged
```
public void inputMethodTextChanged(InputMethodEvent e)
```
    Handles the inputMethodTextChanged event by invoking the inputMethodTextChanged methods on listener-a and listener-b.
    
    Specified by:
    
    inputMethodTextChanged in interface InputMethodListener
    
    Parameters:
    
    e - the item event
  - caretPositionChanged
```
public void caretPositionChanged(InputMethodEvent e)
```
    Handles the caretPositionChanged event by invoking the caretPositionChanged methods on listener-a and listener-b.
    
    Specified by:
    
    caretPositionChanged in interface InputMethodListener
    
    Parameters:
    
    e - the item event
  - hierarchyChanged
```
public void hierarchyChanged(HierarchyEvent e)
```
    Handles the hierarchyChanged event by invoking the hierarchyChanged methods on listener-a and listener-b.
    
    Specified by:
    
    hierarchyChanged in interface HierarchyListener
    
    Parameters:
    
    e - the item event
    
    Since:
    
    1.3
    
    See Also:
    
    HierarchyEvent.getChangeFlags()
  - ancestorMoved
```
public void ancestorMoved(HierarchyEvent e)
```
    Handles the ancestorMoved event by invoking the ancestorMoved methods on listener-a and listener-b.
    
    Specified by:
    
    ancestorMoved in interface HierarchyBoundsListener
    
    Parameters:
    
    e - the item event
    
    Since:
    
    1.3
  - ancestorResized
```
public void ancestorResized(HierarchyEvent e)
```
    Handles the ancestorResized event by invoking the ancestorResized methods on listener-a and listener-b.
    
    Specified by:
    
    ancestorResized in interface HierarchyBoundsListener
    
    Parameters:
    
    e - the item event
    
    Since:
    
    1.3
  - mouseWheelMoved
```
public void mouseWheelMoved(MouseWheelEvent e)
```
    Handles the mouseWheelMoved event by invoking the mouseWheelMoved methods on listener-a and listener-b.
    
    Specified by:
    
    mouseWheelMoved in interface MouseWheelListener
    
    Parameters:
    
    e - the mouse event
    
    Since:
    
    1.4
    
    See Also:
    
    MouseWheelEvent
  - add
```
public static ComponentListener add(ComponentListener a,
                                    ComponentListener b)
```
    Adds component-listener-a with component-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - component-listener-a
    
    b - component-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static ContainerListener add(ContainerListener a,
                                    ContainerListener b)
```
    Adds container-listener-a with container-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - container-listener-a
    
    b - container-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static FocusListener add(FocusListener a,
                                FocusListener b)
```
    Adds focus-listener-a with focus-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - focus-listener-a
    
    b - focus-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static KeyListener add(KeyListener a,
                              KeyListener b)
```
    Adds key-listener-a with key-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - key-listener-a
    
    b - key-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static MouseListener add(MouseListener a,
                                MouseListener b)
```
    Adds mouse-listener-a with mouse-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - mouse-listener-a
    
    b - mouse-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static MouseMotionListener add(MouseMotionListener a,
                                      MouseMotionListener b)
```
    Adds mouse-motion-listener-a with mouse-motion-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - mouse-motion-listener-a
    
    b - mouse-motion-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static WindowListener add(WindowListener a,
                                 WindowListener b)
```
    Adds window-listener-a with window-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - window-listener-a
    
    b - window-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static WindowStateListener add(WindowStateListener a,
                                      WindowStateListener b)
```
    Adds window-state-listener-a with window-state-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - window-state-listener-a
    
    b - window-state-listener-b
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.4
  - add
```
public static WindowFocusListener add(WindowFocusListener a,
                                      WindowFocusListener b)
```
    Adds window-focus-listener-a with window-focus-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - window-focus-listener-a
    
    b - window-focus-listener-b
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.4
  - add
```
public static ActionListener add(ActionListener a,
                                 ActionListener b)
```
    Adds action-listener-a with action-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - action-listener-a
    
    b - action-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static ItemListener add(ItemListener a,
                               ItemListener b)
```
    Adds item-listener-a with item-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - item-listener-a
    
    b - item-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static AdjustmentListener add(AdjustmentListener a,
                                     AdjustmentListener b)
```
    Adds adjustment-listener-a with adjustment-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - adjustment-listener-a
    
    b - adjustment-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static TextListener add(TextListener a,
                               TextListener b)
```
    Adds text-listener-a with text-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - text-listener-a
    
    b - text-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static InputMethodListener add(InputMethodListener a,
                                      InputMethodListener b)
```
    Adds input-method-listener-a with input-method-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - input-method-listener-a
    
    b - input-method-listener-b
    
    Returns:
    
    the resulting listener
  - add
```
public static HierarchyListener add(HierarchyListener a,
                                    HierarchyListener b)
```
    Adds hierarchy-listener-a with hierarchy-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - hierarchy-listener-a
    
    b - hierarchy-listener-b
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.3
  - add
```
public static HierarchyBoundsListener add(HierarchyBoundsListener a,
                                          HierarchyBoundsListener b)
```
    Adds hierarchy-bounds-listener-a with hierarchy-bounds-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - hierarchy-bounds-listener-a
    
    b - hierarchy-bounds-listener-b
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.3
  - add
```
public static MouseWheelListener add(MouseWheelListener a,
                                     MouseWheelListener b)
```
    Adds mouse-wheel-listener-a with mouse-wheel-listener-b and returns the resulting multicast listener.
    
    Parameters:
    
    a - mouse-wheel-listener-a
    
    b - mouse-wheel-listener-b
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.4
  - remove
```
public static ComponentListener remove(ComponentListener l,
                                       ComponentListener oldl)
```
    Removes the old component-listener from component-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - component-listener-l
    
    oldl - the component-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static ContainerListener remove(ContainerListener l,
                                       ContainerListener oldl)
```
    Removes the old container-listener from container-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - container-listener-l
    
    oldl - the container-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static FocusListener remove(FocusListener l,
                                   FocusListener oldl)
```
    Removes the old focus-listener from focus-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - focus-listener-l
    
    oldl - the focus-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static KeyListener remove(KeyListener l,
                                 KeyListener oldl)
```
    Removes the old key-listener from key-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - key-listener-l
    
    oldl - the key-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static MouseListener remove(MouseListener l,
                                   MouseListener oldl)
```
    Removes the old mouse-listener from mouse-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - mouse-listener-l
    
    oldl - the mouse-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static MouseMotionListener remove(MouseMotionListener l,
                                         MouseMotionListener oldl)
```
    Removes the old mouse-motion-listener from mouse-motion-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - mouse-motion-listener-l
    
    oldl - the mouse-motion-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static WindowListener remove(WindowListener l,
                                    WindowListener oldl)
```
    Removes the old window-listener from window-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - window-listener-l
    
    oldl - the window-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static WindowStateListener remove(WindowStateListener l,
                                         WindowStateListener oldl)
```
    Removes the old window-state-listener from window-state-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - window-state-listener-l
    
    oldl - the window-state-listener being removed
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.4
  - remove
```
public static WindowFocusListener remove(WindowFocusListener l,
                                         WindowFocusListener oldl)
```
    Removes the old window-focus-listener from window-focus-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - window-focus-listener-l
    
    oldl - the window-focus-listener being removed
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.4
  - remove
```
public static ActionListener remove(ActionListener l,
                                    ActionListener oldl)
```
    Removes the old action-listener from action-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - action-listener-l
    
    oldl - the action-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static ItemListener remove(ItemListener l,
                                  ItemListener oldl)
```
    Removes the old item-listener from item-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - item-listener-l
    
    oldl - the item-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static AdjustmentListener remove(AdjustmentListener l,
                                        AdjustmentListener oldl)
```
    Removes the old adjustment-listener from adjustment-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - adjustment-listener-l
    
    oldl - the adjustment-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static TextListener remove(TextListener l,
                                  TextListener oldl)
```
    Removes the old text-listener from text-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - text-listener-l
    
    oldl - the text-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static InputMethodListener remove(InputMethodListener l,
                                         InputMethodListener oldl)
```
    Removes the old input-method-listener from input-method-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - input-method-listener-l
    
    oldl - the input-method-listener being removed
    
    Returns:
    
    the resulting listener
  - remove
```
public static HierarchyListener remove(HierarchyListener l,
                                       HierarchyListener oldl)
```
    Removes the old hierarchy-listener from hierarchy-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - hierarchy-listener-l
    
    oldl - the hierarchy-listener being removed
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.3
  - remove
```
public static HierarchyBoundsListener remove(HierarchyBoundsListener l,
                                             HierarchyBoundsListener oldl)
```
    Removes the old hierarchy-bounds-listener from hierarchy-bounds-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - hierarchy-bounds-listener-l
    
    oldl - the hierarchy-bounds-listener being removed
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.3
  - remove
```
public static MouseWheelListener remove(MouseWheelListener l,
                                        MouseWheelListener oldl)
```
    Removes the old mouse-wheel-listener from mouse-wheel-listener-l and returns the resulting multicast listener.
    
    Parameters:
    
    l - mouse-wheel-listener-l
    
    oldl - the mouse-wheel-listener being removed
    
    Returns:
    
    the resulting listener
    
    Since:
    
    1.4
  - addInternal
```
protected static EventListener addInternal(EventListener a,
                                           EventListener b)
```
    Returns the resulting multicast listener from adding listener-a and listener-b together. If listener-a is null, it returns listener-b; If listener-b is null, it returns listener-a If neither are null, then it creates and returns a new AWTEventMulticaster instance which chains a with b.
    
    Parameters:
    
    a - event listener-a
    
    b - event listener-b
    
    Returns:
    
    the resulting listener
  - removeInternal
```
protected static EventListener removeInternal(EventListener l,
                                              EventListener oldl)
```
    Returns the resulting multicast listener after removing the old listener from listener-l. If listener-l equals the old listener OR listener-l is null, returns null. Else if listener-l is an instance of AWTEventMulticaster, then it removes the old listener from it. Else, returns listener l.
    
    Parameters:
    
    l - the listener being removed from
    
    oldl - the listener being removed
    
    Returns:
    
    the resulting listener
  - saveInternal
```
protected void saveInternal(ObjectOutputStream s,
                            String k)
                     throws IOException
```
    Serialization support. Saves all Serializable listeners to a serialization stream.
    
    Parameters:
    
    s - the stream to save to
    
    k - a prefix stream to put before each serializable listener
    
    Throws:
    
    IOException - if serialization fails
  - save
```
protected static void save(ObjectOutputStream s,
                           String k,
                           EventListener l)
                    throws IOException
```
    Saves a Serializable listener chain to a serialization stream.
    
    Parameters:
    
    s - the stream to save to
    
    k - a prefix stream to put before each serializable listener
    
    l - the listener chain to save
    
    Throws:
    
    IOException - if serialization fails
  - getListeners
```
public static <T extends EventListener> T[] getListeners(EventListener l,
                                                         Class<T> listenerType)
```
    Returns an array of all the objects chained as FooListeners by the specified java.util.EventListener. FooListeners are chained by the AWTEventMulticaster using the addFooListener method. If a null listener is specified, this method returns an empty array. If the specified listener is not an instance of AWTEventMulticaster, this method returns an array which contains only the specified listener. If no such listeners are chained, this method returns an empty array.
    
    Type Parameters:
    
    T - the listener type
    
    Parameters:
    
    l - the specified java.util.EventListener
    
    listenerType - the type of listeners requested; this parameter should specify an interface that descends from java.util.EventListener
    
    Returns:
    
    an array of all objects chained as FooListeners by the specified multicast listener, or an empty array if no such listeners have been chained by the specified multicast listener
    
    Throws:
    
    NullPointerException - if the specified listenertype parameter is null
    
    ClassCastException - if listenerType doesn't specify a class or interface that implements java.util.EventListener
    
    Since:
    
    1.4

Modifier and Type	Field	Description
`protected EventListener`	`a`	A variable in the event chain (listener-a)
`protected EventListener`	`b`	A variable in the event chain (listener-b)

Class AWTEventMulticaster

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

a

b

Constructor Detail

AWTEventMulticaster

Method Detail

remove

componentResized

componentMoved

componentShown

componentHidden

componentAdded

componentRemoved

focusGained

focusLost

keyTyped

keyPressed

keyReleased

mouseClicked

mousePressed

mouseReleased

mouseEntered

mouseExited

mouseDragged

mouseMoved

windowOpened

windowClosing

windowClosed

windowIconified

windowDeiconified

windowActivated

windowDeactivated

windowStateChanged

windowGainedFocus

windowLostFocus

actionPerformed

itemStateChanged

adjustmentValueChanged

textValueChanged

inputMethodTextChanged

caretPositionChanged

hierarchyChanged

ancestorMoved

ancestorResized

mouseWheelMoved

add

add

add

add

add

add

add

add

add

add

add

add

add

add

add

add

add

remove

remove

remove

remove

remove

remove

remove

remove

remove

remove

remove

remove

remove