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KeyAdapter.java
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69 lines (65 loc) · 1.7 KB
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/*
* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.awt.event;
/**
* An abstract adapter class for receiving keyboard events.
* The methods in this class are empty. This class exists as
* convenience for creating listener objects.
* <P>
* Extend this class to create a <code>KeyEvent</code> listener
* and override the methods for the events of interest. (If you implement the
* <code>KeyListener</code> interface, you have to define all of
* the methods in it. This abstract class defines null methods for them
* all, so you can only have to define methods for events you care about.)
* <P>
* Create a listener object using the extended class and then register it with
* a component using the component's <code>addKeyListener</code>
* method. When a key is pressed, released, or typed,
* the relevant method in the listener object is invoked,
* and the <code>KeyEvent</code> is passed to it.
*
* @author Carl Quinn
*
* @see KeyEvent
* @see KeyListener
* @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html">Tutorial: Writing a Key Listener</a>
*
* @since 1.1
*/
public abstract class KeyAdapter implements KeyListener {
/**
* Invoked when a key has been typed.
* This event occurs when a key press is followed by a key release.
*/
public void keyTyped(KeyEvent e) {}
/**
* Invoked when a key has been pressed.
*/
public void keyPressed(KeyEvent e) {}
/**
* Invoked when a key has been released.
*/
public void keyReleased(KeyEvent e) {}
}