Java example source code file (KeyAdapter.java)

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Java - Java tags/keywords

keyadapter, keylistener

The KeyAdapter.java Java example source code

/*
 * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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 listener
 * and override the methods for the events of interest. (If you implement the
 * <code>KeyListener 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
 * method. When a key is pressed, released, or typed,
 * the relevant method in the listener object is invoked,
 * and the <code>KeyEvent is passed to it.
 *
 * @author Carl Quinn
 *
 * @see KeyEvent
 * @see KeyListener
 * @see <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html">Tutorial: Writing a Key Listener
 *
 * @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) {}
}