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Beans Events
Beans Events
- So, as we said before, you also have another
way which you can handle events. This is the Java 1.1 methodology.
- The JDK 1.1 model provides two related
options for event handling: listeners and adapters. In the first case,
you can use listener interfaces to catch events by creating a class
that listens for events from other classes. To use listeners, a listener
object implements a listener interface and tells the object it wants to
listen to that it should send event information.
- For example, to determine when an OK
button is pressed, you first create a class that implements an action
listener interface. Next, you create an object of that class type.
Finally, you add that object as a listener to the
OK button's list of listeners.
- You can also use adapter classes in
conjunction with listeners in the JDK 1.1 event model. To catch events
that use adapters, you create a separate class and an object of that
class to listen for events. This class is designed to call methods on
another object when events occur. So, when using adapters, an
intermediate object is used to catch events and pass them on to some
other object.
- Let's take a more detailed look at both listers
and adapters.
Additional Resources:
Exercise Eight
Table of Contents
Beans Event Listeners
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