Just Java™ 2

Summary of Event Handling

We have seen a specific example of handling the event generated by closing a Window. It can be written more compactly if you write it as an inner class or even as an anonymous class. You can junk even more unneeded code if you use an adapter class.

There are several kinds of events for the different controls: a button generates one kind of event, a text field another, and so on. To impose order and to divide them up according to what they do, there are approximately 12 individual Listener interfaces shown in Table 20-1 on page 507. They all work the same way: you write a handler class that implements the interface, and register it with the control. When the control fires an event, the method in the handler object ...