《移动Agent技术》一书的所有章节源代码。

				/*
				 * @(#)FocusListener.java	1.5 96/11/23
				 * 
				 * Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
				 * 
				 * This software is the confidential and proprietary information of Sun
				 * Microsystems, Inc. ("Confidential Information").  You shall not
				 * disclose such Confidential Information and shall use it only in
				 * accordance with the terms of the license agreement you entered into
				 * with Sun.
				 * 
				 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
				 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
				 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
				 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
				 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
				 * THIS SOFTWARE OR ITS DERIVATIVES.
				 * 
				 * CopyrightVersion 1.1_beta
				 * 
				 */
				
				package java.awt.event;
				
				import java.util.EventListener;
				
				/**
				 * The listener interface for receiving keyboard focus events on 
				 * a component.
				 *
				 * @version 1.5 11/23/96
				 * @author Carl Quinn
				 */
				public interface FocusListener extends EventListener {
				
				    /**
				     * 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);
				}