Adds a ChangeListener to the button.

  Notifies all listeners that have registered interest for notification on this event type.

  Notifies all listeners that have registered interest for
notification on this event type. The event instance
is created lazily.
See Also: EventListenerList,

  Returns an array of all the change listeners registered on this DefaultSingleSelectionModel.

  Returns an array of all the change listeners
registered on this DefaultSingleSelectionModel.
Returns: all of this model's ChangeListeners or an empty array if no change listeners are currently registered
Since: 1.4
See Also: DefaultSingleSelectionModel.addChangeListener(javax.swing.event.ChangeListener), DefaultSingleSelectionModel.removeChangeListener(javax.swing.event.ChangeListener),

  Returns an array of all the objects currently registered as FooListeners upon this model.

  Returns an array of all the objects currently registered as FooListeners upon this model. FooListeners are registered using the addFooListener method.

You can specify the listenerType argument with a class literal, such as FooListener.class. For example, you can query a DefaultSingleSelectionModel instance m for its change listeners with the following code:

ChangeListener[] cls = (ChangeListener[])(m.getListeners(ChangeListener.class));

If no such listeners exist, this method returns an empty array.
Returns: an array of all objects registered as FooListeners on this model, or an empty array if no such listeners have been added
Parameters:
- listenerType - the type of listeners requested; this parameter should specify an interface that descends from java.util.EventListener
Throws:
- ClassCastException - if listenerType doesn't specify a class or interface that implements java.util.EventListener
Since: 1.3
See Also: DefaultSingleSelectionModel.getChangeListeners(),

Removes a ChangeListener from the button.