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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 focus 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>FocusEvent</code> listener

* and override the methods for the events of interest. (If you implement the

* <code>FocusListener</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>addFocusListener</code>

* method. When the component gains or loses the keyboard focus,

* the relevant method in the listener object is invoked,

* and the <code>FocusEvent</code> is passed to it.

*

* @see FocusEvent

* @see FocusListener

* @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/focuslistener.html">Tutorial: Writing a Focus Listener</a>

*

* @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) {}

}