program that describe use of ActionListener interface in applet

import java.lang.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="text" width=200 height=200>
</applet>
*/
 public class text extends Applet implements ActionListener
{
    Label lbl1,lbl2;
    TextField txt1,txt2;
    Button b;
    String s;
      public void init()
      {
       lbl1=new Label("Text1");
       txt1=new TextField(10);
       lbl2=new Label("Text2");
       txt2=new TextField(20);
        b=new Button("Enter");
        add(lbl1); 
        add(txt1); 
        add(lbl2); 
        add(txt2);
         add(b); 
        txt1.addActionListener(this);
        txt2.addActionListener(this);
        b.addActionListener(this);
       }
        public void actionPerformed (ActionEvent ae)
       { int n1,n2,ans;
    try
    {
    n1=Integer.parseInt(txt1.getText());
    n2=Integer.parseInt(txt2.getText());
    ans=n1+n2;
    s="Addition of n1 ans n2  is "+ ans;
    repaint();
    }
    catch(NumberFormatException e)
    {
       
    s=txt1.getText()+" "+txt2.getText();
    repaint();
    }
       }
       public void paint(Graphics g)
       {
        g.drawString(s,100,100);
     

       }
}

program to illustrate use of Label, TextField in applet.

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

/* <applet code = "applet1" height=150 width=380>
   </applet>
*/

public class applet1 extends Applet implements ActionListener
{
   TextField age,hobby;
  public void init()
      {
            Label l1,l2;
            l1 = new Label("Age :- ",Label.RIGHT);
            l2 = new Label("Hobby :- ");
     
            age=new TextField(5);
            hobby=new TextField(12);
           
            add(l1);
            add(age);
            add(l2);
            add(hobby);
           
            age.addActionListener(this);
            hobby.addActionListener(this);
               
       }
   // User pressed Enter
   public void actionPerformed(ActionEvent ae)
   {
    repaint();
    }
   public void paint(Graphics g)
    {
     g.drawString("Age :- " + age.getText(),6,60);
     g.drawString("Hobby :- " + hobby.getText(),6,80);
    }     
}      

program that dispaly rotating banner in applet

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

/* <applet code="banner" width=300 height=200>
   </applet> */

 public class banner extends Applet implements Runnable 
   {
     Font f;
    String mgs="welcome to applet programming language...";
    Thread t=null;
    int state;
    boolean stopflag;
 public void init()
   {
     f=new Font(mgs,Font.ITALIC|Font.BOLD,30);
    setBackground(Color.red);
    setForeground(Color.black);
    setFont(f);

   }
 public void start()
   {
    t=new Thread(this);
    stopflag=false;
    t.start();
   }
 public void run()
   {
    char ch;
    for(;;)
    {
    try
     {
      repaint();
      Thread.sleep(500);
      ch=mgs.charAt(0);
      mgs=mgs.substring(1,mgs.length());
      mgs +=ch;
      if(stopflag)
        break;
     }catch(InterruptedException e){}
   }
 }
 public void stop()
   {
    stopflag=true;
    t=null;
   }
 public void paint(Graphics g)
   {
    g.drawString(mgs,100,100);
   }
 }