Programming

import java.awt.*;
import java.applet.*;
import java.awt.event.TextEvent;
import javax.swing.*;
import java.awt.event.TextListener;
import java.awt.TextComponent;
 
 
public class Event_Handling extends Applet implements TextListener
{
String s;
 
public void init()
{
addTextListener( this ); // Compiler says it(addTextListener) is not defined
addTextListener( this );
TextField tf1 = new TextField();
add( tf1 );
}
public void paint( Graphics g )
{
g.drawString(msg, 50, 50);
}
public void textValueChanged( TextEvent te )
{
msg = "Text value changed";
repaint();
}
}