A clock using Applet in java pgm

Display a clock using Applet

import java.awt.*;

import java.applet.*;

import java.applet.*;

import java.awt.*;

import java.util.*;

public class ClockApplet extends Applet implements Runnable

{

   Thread t,t1;

   public void start()

  {

      t = new Thread(this);

      t.start();

   }

   public void run()

   {

      t1 = Thread.currentThread();

      while(t1 == t)

      {

         repaint();

         try

        {

            t1.sleep(1000);   

         }

         catch(InterruptedException e){}

      }

   }

   public void paint(Graphics g)

  {

      Calendar cal = new GregorianCalendar();

      String hour = String.valueOf(cal.get(Calendar.Hour));

      String minute = String.valueOf(cal.get(Calendar.Minute));

      String second = String.valueOf(cal.get(Calendar.Second));

      g.drawString(hour + ":" + minute + ":" + second, 20, 30);

   }

}