Add a PropertyChangeListener to the listener list.

  Add a PropertyChangeListener to the listener list.
The listener is registered for all properties.
The same listener object may be added more than once, and will be called
as many times as it is added.
If listener is null, no exception is thrown and no action
is taken.
Parameters:
- listener - The PropertyChangeListener to be added

  Add a PropertyChangeListener for a specific property.

  Add a PropertyChangeListener for a specific property. The listener
will be invoked only when a call on firePropertyChange names that
specific property.
The same listener object may be added more than once. For each
property, the listener will be invoked the number of times it was added
for that property.
If propertyName or listener is null, no
exception is thrown and no action is taken.
Parameters:
- propertyName - The name of the property to listen on.
- listener - The PropertyChangeListener to be added

  Report a boolean bound indexed property update to any registered listeners.

  Report a boolean bound indexed property update to any registered listeners.

No event is fired if old and new values are equal.

This is merely a convenience wrapper around the more general fireIndexedPropertyChange method which takes Object values.
Parameters:
- propertyName - The programmatic name of the property that was changed.
- index - index of the property element that was changed.
- oldValue - The old value of the property.
- newValue - The new value of the property.
Since: 1.5

  Report an int bound indexed property update to any registered listeners.

  Report an int bound indexed property update to any registered listeners.

No event is fired if old and new values are equal.

This is merely a convenience wrapper around the more general fireIndexedPropertyChange method which takes Object values.
Parameters:
- propertyName - The programmatic name of the property that was changed.
- index - index of the property element that was changed.
- oldValue - The old value of the property.
- newValue - The new value of the property.
Since: 1.5

  Report a bound indexed property update to any registered listeners.

  Report a bound indexed property update to any registered listeners.

No event is fired if old and new values are equal and non-null.

This is merely a convenience wrapper around the more general firePropertyChange method that takes PropertyChangeEvent value.
Parameters:
- propertyName - The programmatic name of the property that was changed.
- index - index of the property element that was changed.
- oldValue - The old value of the property.
- newValue - The new value of the property.
Since: 1.5

  Report a boolean bound property update to any registered listeners.

  Report a boolean bound property update to any registered listeners. No event is fired if old and new are equal.

This is merely a convenience wrapper around the more general firePropertyChange method that takes Object values.
Parameters:
- propertyName - The programmatic name of the property that was changed.
- oldValue - The old value of the property.
- newValue - The new value of the property.

  Report an int bound property update to any registered listeners.

  Report an int bound property update to any registered listeners. No event is fired if old and new are equal.

This is merely a convenience wrapper around the more general firePropertyChange method that takes Object values.
Parameters:
- propertyName - The programmatic name of the property that was changed.
- oldValue - The old value of the property.
- newValue - The new value of the property.

  Report a bound property update to any registered listeners.

  Report a bound property update to any registered listeners. No event is fired if old and new are equal and non-null.

This is merely a convenience wrapper around the more general firePropertyChange method that takes PropertyChangeEvent value.
Parameters:
- propertyName - The programmatic name of the property that was changed.
- oldValue - The old value of the property.
- newValue - The new value of the property.

  Returns an array of all the listeners that were added to the PropertyChangeSupport object with addPropertyChangeListener().

  Returns an array of all the listeners that were added to the PropertyChangeSupport object with addPropertyChangeListener().

If some listeners have been added with a named property, then the returned array will be a mixture of PropertyChangeListeners and PropertyChangeListenerProxys. If the calling method is interested in distinguishing the listeners then it must test each element to see if it's a PropertyChangeListenerProxy, perform the cast, and examine the parameter.

 PropertyChangeListener[] listeners = bean.getPropertyChangeListeners();
 for (int i = 0; i < listeners.length; i++) {
         if (listeners[i] instanceof PropertyChangeListenerProxy) {
     PropertyChangeListenerProxy proxy = 
                    (PropertyChangeListenerProxy)listeners[i];
     if (proxy.getPropertyName().equals("foo")) {
       // proxy is a PropertyChangeListener which was associated
       // with the property named "foo"
     }
   }
 }

Returns: all of the PropertyChangeListeners added or an empty array if no listeners have been added
Since: 1.4
See Also: PropertyChangeListenerProxy,

  Returns an array of all the listeners which have been associated with the named property.

  Returns an array of all the listeners which have been associated
with the named property.
Returns: all of the PropertyChangeListeners associated with the named property. If no such listeners have been added, or if propertyName is null, an empty array is returned.
Parameters:
- propertyName - The name of the property being listened to
Since: 1.4

  Check if there are any listeners for a specific property, including those registered on all properties.

  Check if there are any listeners for a specific property, including
those registered on all properties. If propertyName
is null, only check for listeners registered on all properties.
Returns: true if there are one or more listeners for the given property
Parameters:
- propertyName - the property name.

  Remove a PropertyChangeListener from the listener list.

  Remove a PropertyChangeListener from the listener list.
This removes a PropertyChangeListener that was registered
for all properties.
If listener was added more than once to the same event
source, it will be notified one less time after being removed.
If listener is null, or was never added, no exception is
thrown and no action is taken.
Parameters:
- listener - The PropertyChangeListener to be removed

  Remove a PropertyChangeListener for a specific property.

  Remove a PropertyChangeListener for a specific property.
If listener was added more than once to the same event
source for the specified property, it will be notified one less time
after being removed.
If propertyName is null, no exception is thrown and no
action is taken.
If listener is null, or was never added for the specified
property, no exception is thrown and no action is taken.
Parameters:
- propertyName - The name of the property that was listened on.
- listener - The PropertyChangeListener to be removed