java.lang.Object | +----java.awt.AWTEventMulticaster
public class AWTEventMulticaster
extends Object
implements ComponentListener, ContainerListener, FocusListener, KeyListener, MouseListener, MouseMotionListener, WindowListener, ActionListener, ItemListener, AdjustmentListener, TextListener
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 void addActionListener(ActionListener l) { actionListener = AWTEventMulticaster.add(actionListener, l); } public 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()); } }