Delegation Event Model

The main idea behind the "delegation" event model is that event handling is delegated to different objects and methods rather than having your GUI handle all the events.
The idea is that events are processed by event listeners, which are separate objects that handle specific types of events.
Note: In order to use the delegation event model properly, the GUI should not be the listener.
The listener registers and specifies which events are of interest (for instance mouse events).
Only those events that are being listened for will be processed.
Each different event type uses a separate Event class.
Each different kind of listener also uses a separate class.
This model also allows your GUI to be organized such that the application code (Controller) and the interface code (the View) can be separated.
Download the examples in downloads/swing/events
These examples show Event Handling in Applets rather than GUI applications, but the Event-handling code is the same.