for Schleife unterbrechen und auf Mausklick warten

import java.awt.*;

public class dreieck extends java.applet.Applet{
	int x = 1;
	int y = 1;
	
	public void paint(Graphics g) {
		g.fillOval(51,248,2,2);
		g.fillOval(447,248,2,2);
		g.fillOval(249,50,2,2);
		g.setColor(Color.black);
		
		int i;
		double abc;

		g.setColor(Color.black);
		g.fillRect(x,y, 2,2);
		g.setColor(Color.black);

		for (i=0;i<3000;i++) {
			abc = (Math.random()*3);
			if(abc<1) {
				x=(x+50)/2;
				y=(y+250)/2;
				g.fillOval(x,y, 2,2);
			}
			else if(abc<2) {
				x=(x+450)/2;
				y=(y+250)/2;
				g.fillOval(x,y, 2,2);
			}
			else {
				x=(x+250)/2;
				y=(y+50)/2;
				g.fillOval(x,y, 2,2);
			}
		}
	}
}

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;

import javax.swing.JApplet;

/*
 * Created on 02.06.2004
 */

/**
 * @author Administrator
 */
public class MyApplet extends JApplet {

	private volatile boolean stopped = false;

	private BufferedImage image;
	private Graphics2D g2d;
	private Graphics gScreen;

	private int x = 160;
	private int y = 120;

	private int maxRadius = 100;
	private int radius;

	private Thread thread = new Thread() {

		{
			setPriority(Thread.MIN_PRIORITY);
		}
			
		public void run() {
			try {
				while (true) {
					while (stopped) {
						Thread.sleep(250l);
						gScreen.drawImage(image, 0, 0, null);
					}
					while (!stopped) {
						// Die Zeichenarbeit wird hier erledigt...
						Thread.sleep(25l);

						g2d.clearRect(0, 0, 320, 240);

						radius = (radius + 2 ) % maxRadius;
						
						g2d.setColor(Color.RED);
						g2d.fillOval(x-radius/2, y-radius/2, radius, radius);
				
						gScreen.drawImage(image, 0, 0, null);
					}
				}
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	};

	public void init() {
		setSize(320, 240);
		getContentPane().addMouseListener(new MouseAdapter() {
			public void mousePressed(MouseEvent evt) {
				//Applet anhalten ...
				stopped = !stopped;
			}
		});
	}

	public void start() {
		image = new BufferedImage(320, 240, BufferedImage.TYPE_INT_RGB);
		g2d = (Graphics2D) image.getGraphics();
		gScreen = getContentPane().getGraphics();
		thread.start();

	}
}

stopped = true;