kinds of events; they define the methods that are called when events of the you override an event-handler method, it is a good idea to call the overridden
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The Java AWT (Abstract Window Toolkit) package is the Swing GUIs are designed using a form of object-oriented define or redefine these event- handler
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What is Delegation Event Model? • The Delegation Model used by Java to handle user interaction with GUI registered listeners (method of event listener is
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event handler method (e g , paint) that is invoked every time that the appropriate event is triggered events Here is the definition of the ActionListener interface:
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Listener classes ButtonDemo1 java defines a class that is used only once to create a listener for a single button – Could have been a top-level class, but in this
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Define new listener interfaces for new categories of events • Understand the Explain the Delegation Event Model used through Java 1 1 (and later)
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Using event listeners to handle an event is a three-step process First, you must define a class that implements the appropriate listener interface (this includes
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event The class that implements the interface defines those methods, and can be GUI Event Handling 11 Java Programming java util EventObject java awt
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The methods that receive and process events are defined in a set of interfaces, such as those found in java awt event For example, the MouseMotionListener
Event Handling