Serializable
public class EventListenerList extends Object implements Serializable
EventListenerList listenerList = new EventListenerList(); FooEvent fooEvent = null; public void addFooListener(FooListener l) { listenerList.add(FooListener.class, l); } public void removeFooListener(FooListener l) { listenerList.remove(FooListener.class, l); } // Notify all listeners that have registered interest for // notification on this event type. The event instance // is lazily created using the parameters passed into // the fire method. protected void fireFooXXX() { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); // Process the listeners last to first, notifying // those that are interested in this event for (int i = listeners.length-2; i>=0; i-=2) { if (listeners[i]==FooListener.class) { // Lazily create the event: if (fooEvent == null) fooEvent = new FooEvent(this); ((FooListener)listeners[i+1]).fooXXX(fooEvent); } } }foo should be changed to the appropriate name, and fireFooXxx to the appropriate method name. One fire method should exist for each notification method in the FooListener interface.
Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the java.beans
package. Please see XMLEncoder
.
Modifier and Type | Field | Description |
---|---|---|
protected Object[] |
listenerList |
The list of ListenerType - Listener pairs |
Constructor | Description |
---|---|
EventListenerList() |
Constructs a EventListenerList . |
Modifier and Type | Method | Description |
---|---|---|
<T extends EventListener> |
add |
Adds the listener as a listener of the specified type. |
int |
getListenerCount() |
Returns the total number of listeners for this listener list. |
int |
getListenerCount |
Returns the total number of listeners of the supplied type for this listener list. |
Object[] |
getListenerList() |
Passes back the event listener list as an array of ListenerType-listener pairs. |
<T extends EventListener> |
getListeners |
Return an array of all the listeners of the given type. |
<T extends EventListener> |
remove |
Removes the listener as a listener of the specified type. |
String |
toString() |
Returns a string representation of the EventListenerList. |
protected transient volatile Object[] listenerList
public EventListenerList()
EventListenerList
.public Object[] getListenerList()
public <T extends EventListener> T[] getListeners(Class<T> t)
T
- the type of EventListener
to search fort
- the type of EventListener
classes to be returnedClassCastException
- if the supplied class is not assignable to EventListenerpublic int getListenerCount()
public int getListenerCount(Class<?> t)
t
- the type of listeners to countt
public <T extends EventListener> void add(Class<T> t, T l)
T
- the type of EventListener
to addt
- the type of the EventListener
class to addl
- the listener to be addedpublic <T extends EventListener> void remove(Class<T> t, T l)
T
- the type of EventListener
t
- the type of the listener to be removedl
- the listener to be removedpublic String toString()
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/event/EventListenerList.html