Applet communication (talk to each other) : Applet « Swing JFC « Java

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Java » Swing JFC » AppletScreenshots 
Applet communication (talk to each other)
   
/* From http://java.sun.com/docs/books/tutorial/index.html */

/*
 * Copyright (c) 2006 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:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution 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, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

<applet code=Sender.class width=450 height=200
 name="buddy">
<param name="receiverName" value="old pal">
</applet>
<p>
<applet code=Receiver.class width=450 height=35>
<param name="name" value="old pal">
</applet>

<applet code=GetApplets.class width=400 height=150>
</applet>




/* 
 * 1.1 version.
 */

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Enumeration;

public class Sender extends Applet 
                    implements ActionListener {
    private String myName;
    private TextField nameField;
    private TextArea status;
    private String newline;

    public void init() {
        GridBagLayout gridBag = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();

        setLayout(gridBag);

        Label receiverLabel = new Label("Receiver name:"
                                        Label.RIGHT);
        gridBag.setConstraints(receiverLabel, c);
        add(receiverLabel);

        nameField = new TextField(getParameter("RECEIVERNAME"),
                                               10);
        c.fill = GridBagConstraints.HORIZONTAL;
        gridBag.setConstraints(nameField, c);
        add(nameField);
        nameField.addActionListener(this);

        Button button = new Button("Send message");
        c.gridwidth = GridBagConstraints.REMAINDER; //end row
        c.anchor = GridBagConstraints.WEST; //stick to the 
                                            //text field
        c.fill = GridBagConstraints.NONE; //keep the button 
                                          //small
        gridBag.setConstraints(button, c);
        add(button);
        button.addActionListener(this);

        status = new TextArea(560);
        status.setEditable(false);
        c.anchor = GridBagConstraints.CENTER; //reset to the default
        c.fill = GridBagConstraints.BOTH; //make this big
        c.weightx = 1.0;
        c.weighty = 1.0;
        gridBag.setConstraints(status, c);
        add(status);

        myName = getParameter("NAME");
        Label senderLabel = new Label("(My name is " + myName + ".)",
                                      Label.CENTER);
        c.weightx = 0.0;
        c.weighty = 0.0;
        gridBag.setConstraints(senderLabel, c);
        add(senderLabel);

  newline = System.getProperty("line.separator");
    }

    public void actionPerformed(ActionEvent event) {
        Applet receiver = null;
        String receiverName = nameField.getText()//Get name to 
                                                   //search for.
        receiver = getAppletContext().getApplet(receiverName);
        if (receiver != null) {
            //Use the instanceof operator to make sure the applet
            //we found is a Receiver object.
            if (!(receiver instanceof Receiver)) {
                status.append("Found applet named "
                              + receiverName + ", "
                              "but it's not a Receiver object."
            + newline);
            else {
                status.append("Found applet named "
                              + receiverName + newline
                              "  Sending message to it."
            + newline);
                //Cast the receiver to be a Receiver object
                //(instead of just an Applet object) so that the
                //compiler will let us call a Receiver method.
                ((Receiver)receiver).processRequestFrom(myName);
            }
        else {
            status.append("Couldn't find any applet named "
                          + receiverName + "." + newline);
        }
    }

    public Insets getInsets() {
        return new Insets(3,3,3,3);
    }

    public void paint(Graphics g) {
        g.drawRect(00
                   getSize().width - 1, getSize().height - 1);
    }

    public String getAppletInfo() {
        return "Sender by Kathy Walrath";
    }
}



/* 
 * 1.1 version.
 */

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

public class Receiver extends Applet 
                      implements ActionListener {
    private final String waitingMessage = 
            "Waiting for a message...           ";
    private Label label = new Label(waitingMessage, 
                                    Label.RIGHT);

    public void init() {
  Button button = new Button("Clear");
        add(label);
        add(button);
  button.addActionListener(this);
        add(new Label("(My name is " + getParameter("name"
                      ".)"
                      Label.LEFT))
    }

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

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

    public void paint(Graphics g) {
        g.drawRect(00
                   getSize().width - 1, getSize().height - 1);
    }

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

           
         
    
    
  
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