receiver.java

来自「java tutorial.sun公司官方出品。java入门书籍。最新版」· Java 代码 · 共 95 行

/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

/* 
 * Java(TM) SE 6 version.
 */

import java.applet.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Receiver extends JApplet 
                      implements ActionListener {
    private final String waitingMessage = 
            "Waiting for a message...           ";
    private JLabel label;

    public void init() {
        //Set up the UI.
        //Execute a job on the event-dispatching thread:
        //creating this applet's GUI.
        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                public void run() {
                    createGUI();
                }
            });
        } catch (Exception e) {
            System.err.println("createGUI didn't successfully complete");
        }
    }

    private void createGUI() {
        JPanel contentPane = new JPanel(); //use default FlowLayout
        contentPane.setBorder(BorderFactory.createCompoundBorder(
                                    BorderFactory.createLineBorder(Color.black),
                                    BorderFactory.createEmptyBorder(5,20,5,10)));
        setContentPane(contentPane);
        
        JButton button = new JButton("Clear");
	button.addActionListener(this);
        
        label = new JLabel(waitingMessage, JLabel.TRAILING);
        
        add(label);
        add(button);
        add(new JLabel("(My name is " + getParameter("name") 
                       + ".)", 
                       JLabel.LEADING)); 
    }

    public void actionPerformed(ActionEvent event) {
        label.setText(waitingMessage);
    }

    public void processRequestFrom(String senderName) {
        label.setText("Received message from " 
                      + senderName + "!");
    }

    public String getAppletInfo() {
        return "Receiver (named " + getParameter("name") + 
               ") by Kathy Walrath";
    }
}