Event Model - II
The event source notifies event listeners by invoking a particular method of the event listener (aka the event handler method) and passing it an Event object, which has all the information about the event.
- public class EventClass implements ActionListener
- {
- public void actionPerformed ( ActionEvent ev )
- {. . . put code here to respond to event ev . . . }
- }
Each basic component has a defined Event class, Listener interface, and event handling method names.
Note that an interface is a class in which there are headers of methods with no method body. It just gives the name(s) of methods such as actionPerformed that the user is to provide.