/* * Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * * * * * * * * * * * * * * * * * * * * */ package java.awt.event; /** * An abstract adapter class for receiving keyboard focus events. * The methods in this class are empty. This class exists as * convenience for creating listener objects. *
* Extend this class to create a FocusEvent
listener
* and override the methods for the events of interest. (If you implement the
* FocusListener
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.)
*
* Create a listener object using the extended class and then register it with
* a component using the component's addFocusListener
* method. When the component gains or loses the keyboard focus,
* the relevant method in the listener object is invoked,
* and the FocusEvent
is passed to it.
*
* @see FocusEvent
* @see FocusListener
* @see Tutorial: Writing a Focus Listener
*
* @author Carl Quinn
* @since 1.1
*/
public abstract class FocusAdapter implements FocusListener {
/**
* Invoked when a component gains the keyboard focus.
*/
public void focusGained(FocusEvent e) {}
/**
* Invoked when a component loses the keyboard focus.
*/
public void focusLost(FocusEvent e) {}
}