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63 lines
1.6 KiB
63 lines
1.6 KiB
/*
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* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*/
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package java.awt.event;
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/**
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* An abstract adapter class for receiving keyboard focus events.
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* The methods in this class are empty. This class exists as
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* convenience for creating listener objects.
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* <P>
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* Extend this class to create a <code>FocusEvent</code> listener
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* and override the methods for the events of interest. (If you implement the
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* <code>FocusListener</code> interface, you have to define all of
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* the methods in it. This abstract class defines null methods for them
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* all, so you can only have to define methods for events you care about.)
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* <P>
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* Create a listener object using the extended class and then register it with
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* a component using the component's <code>addFocusListener</code>
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* method. When the component gains or loses the keyboard focus,
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* the relevant method in the listener object is invoked,
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* and the <code>FocusEvent</code> is passed to it.
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*
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* @see FocusEvent
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* @see FocusListener
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* @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/focuslistener.html">Tutorial: Writing a Focus Listener</a>
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*
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* @author Carl Quinn
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* @since 1.1
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*/
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public abstract class FocusAdapter implements FocusListener {
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/**
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* Invoked when a component gains the keyboard focus.
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*/
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public void focusGained(FocusEvent e) {}
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/**
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* Invoked when a component loses the keyboard focus.
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*/
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public void focusLost(FocusEvent e) {}
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}
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