import java.awt.*;
import java.util.*;

class TickerThread extends Thread {
    ClockLabel c1;
    public TickerThread(ClockLabel c) {
	c1 = c;
    }
    public void run() {
	while(true) {
	    try { sleep(2000); }
	    catch (InterruptedException e) { break; }
	    c1.updateTime();
	}
    }
}
	

/**
 * A Label subclass that offers a time-of-day clock
 * which updates every two seconds.  Use the startClock()
 * method to start keeping time, and stopClock() to stop
 * keeping time.
 */
public class ClockLabel extends Label {
    Thread ticker;

    public ClockLabel() {
	super("Clock", Label.CENTER);
	ticker = null;
    }
    public void startClock() {
	if (ticker == null) {
	    ticker = new TickerThread(this);
	    ticker.start();
	}
	updateTime();
    }
    public void stopClock() {
	ticker.interrupt();
	ticker = null;
    }
    public void updateTime() {
	Date now = new Date();
	String time = now.toString().substring(11,23);
	setText(time);
    }
    public static void main(String [] args) {
	Frame fr = new Frame("Clock test");
	Label l1 = new Label("THIS IS A LABEL!");
	ClockLabel c1 = new ClockLabel();
	c1.setBackground(Color.gray);
	System.out.println("Starting the clock");
	c1.startClock();
	fr.add(l1,"Center");
	fr.add(c1,"North");
	fr.pack();
	fr.show();
	try { Thread.sleep(10000); }
	catch (InterruptedException e) { }
	System.out.println("Stopping the clock");
	c1.stopClock();
	try { Thread.sleep(12000); }
	catch (InterruptedException e) { }
	System.out.println("Starting the clock again");
	c1.startClock();

    }
}