Display time

CODE:
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.Label;
import java.text.DateFormat;
import java.util.Date;

/*
<applet code="Time.class"
  width=200
  height=100>
</applet>
*/


public class Time extends Applet implements Runnable
{
Label showTime;
DateFormat timeFormat;
Thread timerTh;
volatile boolean running;

public void init()
{
showTime = new Label();
showTime.setFont(new Font("helvetica", Font.BOLD, 20));
showTime.setAlignment(Label.CENTER);
setLayout(new BorderLayout());
add(showTime, BorderLayout.CENTER);
timeFormat = DateFormat.getTimeInstance(DateFormat.MEDIUM);
}
public void start()
{
running = true;
if (timerTh == null)
{
timerTh = new Thread(this);
timerTh.start();
}
}
public void run()
{
while (running)
{
showTime.setText(timeFormat.format(new Date()));
try
{
Thread.sleep(1000);
}
catch (InterruptedException e)
{ }
}
   timerTh = null;
}

public void stop()
{
running = false;
}

}
OUTPUT: