Communication between Applets

Question

Please check these code samples:

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

public class pp extends Applet implements ActionListener
{
    TextField t;
    Button    b;

    public void init()     
    {
        setLayout(new FlowLayout());
        t= new TextField(10 );
        b = new Button("Send");
        b.addActionListener(this);
        add(t);
        add(b);
    }

    public void actionPerformed(ActionEvent e) 
    {
        String str=t.getText();
        dc a2 =(dc)getAppletContext().getApplet("a2");
           if ( a2 != null ) 
               {
                  a2.append(str);
               }
           else 
           {
              System.out.println("Applet not found?");
           }
     }
}

and the 2nd applet code:

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
/*<Applet code="dc" height=400 width=400></Applet>*/
public class dc extends Applet
{
    TextArea t;

    public void init()
    {
        setLayout(new FlowLayout());
        t=new TextArea(5,40);
        add(t);
    }

    public void append(String msg)
    {
        t.setText(msg);
    }
}

and here is the HTML code:

<HTML><HEAD></HEAD><BODY>
<APPLET CODE="pp.class"   
    HEIGHT=200 WIDTH=150>
</APPLET>
<APPLET CODE="dc.class"  
    HEIGHT=200 WIDTH=400>
</APPLET>
</BODY></HEAD>

Don't know why it doesn't work. This program is writeen for communication between the two applets in the same page. Can anyone tell me what is wrong here?

What do you get on the Java console? Does it say "Applet not found?" — Cameron Skinner, Dec 29 '10 at 16:14
If you want help, please read the "how to ask a question" section before posting on here. http://stackoverflow.com/questions/how-to-ask . Your "Doubt in java programming...!!" title tells us nothing about what you want to know. Also, it helps to format your code so it's readable. — 08Hawkeye, Dec 29 '10 at 16:15

score 1 · Accepted Answer · edited May 23 '17 at 11:47

1

See Inter applet communication

This looks very similar to what you are doing.

edited May 23 '17 at 11:47

Community

1
1

answered Dec 29 '10 at 16:16

Cameron Skinner

51,692
2
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86

score 1 · Answer 2 · edited Jun 17 '11 at 15:06

First applet:

import java.awt.*;
import java.applet.*;
public class ONE extends Applet
{
    TextArea ta;
    public void init()
    {
        ta=new TextArea(" ");
        add(ta);
    }
    public void putText(String s)
    {
        ta.appendText(s+"\n");
    }
}

Second applet:

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


public class TWO extends Applet implements ActionListener
{
    TextField tf;
    Applet r;
    Button b;
    public void init()
    {
        tf=new TextField(20);
        add(tf);
        b=new Button("SUMBIT");
        add(b);
        b.addActionListener(this);
    }
    public void actionPerformed(ActionEvent e)
    {   r=null;
        r= getAppletContext().getApplet("ONE");
        if (r!=null)
        {
            if(e.getSource()==b)
            {
                ONE ma= (ONE) r;
                ma.putText(tf.getText());
                tf.setText("");
            }
        }       
    }
}

Use the above code in action performed.

HTML:

<html>
<body>
<applet code="TWO" width = 150 height=150 name=TWO>
</applet>
<br></br>
<br></br>
<br></br>
<applet code="ONE" width = 200 height=200 name=ONE>
</applet>
</body>
</html>

Run it using appletviewer.

Communication between Applets

2 Answers2