September 1998
Intermediate to advanced
970 pages
18h 42m
English
Content preview from Graphic Java™ 1.2, Volume I: AWT, Third EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The Big Picture
All of the action, as far as events and listeners are concerned, starts in the java.util package. java.util comes with a class and an interface—EventObject and EventListener, respectively, which form the foundation of the delegation event model. EventObject is a simple class that does nothing more than keep track of its event source, and EventListener is a tagging[1] interface, which all listeners extend. EventListener and EventObject anchor hierarchies of listeners and events, respectively. Figure 9-3 shows the event listeners, all of which extend the java.util.EventListener interface.
[1] A tagging interface does not define any methods.
Figure 9-3. Event Listener Interfaces. All of the event listener interfaces shown above reside ...
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