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## java.awt
Class AWTEventMulticaster

    java.lang.Object
      |
      +--java.awt.AWTEventMulticaster

All Implemented Interfaces:
  ActionListener, AdjustmentListener, ComponentListener, ContainerListener, EventListener, FocusListener, HierarchyBoundsListener, HierarchyListener, InputMethodListener, ItemListener, KeyListener, MouseListener, MouseMotionListener, MouseWheelListener, TextListener, WindowFocusListener, WindowListener, WindowStateListener

public class AWTEventMulticaster
extends Object
implements ComponentListener, ContainerListener, FocusListener, KeyListener, MouseListener, MouseMotionListener, WindowListener, WindowFocusListener, WindowStateListener, ActionListener, ItemListener, AdjustmentListener, TextListener, InputMethodListener, HierarchyListener, HierarchyBoundsListener, MouseWheelListener

A class which implements efficient and thread-safe multi-cast event dispatching for the AWT events defined in the java.awt.event package. This class will manage an immutable structure consisting of a chain of event listeners and will dispatch events to those listeners. Because the structure is immutable, it is safe to use this API to add/remove listeners during the process of an event dispatch operation. An example of how this class could be used to implement a new component which fires "action" events:

     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
             if (actionListener != null) {
                 actionListener.actionPerformed(new ActionEvent());
             }
     }

Since:
  1.1

Field Summary
`protected EventListener` | `a`
`protected EventListener` | `b`

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

Method Summary
`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)`
`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 EventListener[]` | `getListeners(EventListener l, Class 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.
`protected EventListener` | `remove(EventListener oldl)` Removes a listener from this multicaster 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)`
`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 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)`
`protected void` | `saveInternal(ObjectOutputStream s, String k)`
`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 windowDeiconfied 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

### b

    protected final EventListener 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 and returns the resulting multicast listener.

  Parameters:
    `oldl` - the listener to be removed

### 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 windowDeiconfied 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

### 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

### 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

### 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`

### 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
  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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### add

    public static TextListener add(TextListener a,
                                   TextListener b)

### 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

### 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

### 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

### 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
  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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### remove

    public static TextListener remove(TextListener l,
                                      TextListener oldl)

### 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

### 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

### 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

### 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
  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

### 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

### saveInternal

    protected void saveInternal(ObjectOutputStream s,
                                String k)
                         throws IOException

    `IOException`

### save

    protected static void save(ObjectOutputStream s,
                               String k,
                               EventListener l)
                        throws IOException

    `IOException`

### getListeners

    public static EventListener[] getListeners(EventListener l,
                                               Class listenerType)

  Returns an array of all the objects chained as `FooListener`s by the specified `java.util.EventListener`. `FooListener`s 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 chanined, this method returns an empty array.

  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 `FooListener`s by the specified multicast listener, or an empty array if no such listeners have been chained by the specified multicast listener
  Throws:
    `ClassCastException` - if `listenerType` doesn't specify a class or interface that implements `java.util.EventListener`
  Since:
    1.4

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