package exploringjava.threads;

public class UpdateApplet extends java.applet.Applet implements Runnable {
	private Thread updateThread;
	int updateInterval = 1000;

	public void run() {
		while ( true ) {
			try {  
				Thread.sleep( updateInterval ); 
			} catch (InterruptedException e ) { 
				return;
			 }
			repaint();
		}
	}

	public void start() {
		if ( updateThread == null ) {
			updateThread = new Thread(this);
			updateThread.start();
		}
	}

	public void stop() {
		if ( updateThread != null ) {
			updateThread.stop();
			updateThread = null;
		}
	}
}