/* Particle.java
 */

import java.awt.*;

public class Particle
{
   protected int x;
   protected int y;
   protected final Random rng = new Random();

   public Particle(int initialX, int initialY) {
     x = initialX;
     y = initialY;
   }

   public synchronized void move() {
     x += rng.nextInt(10) - 5;
     y += rng.nextInt(20) - 10;
   }

   public void draw(Graphics g) {
     int lx, ly;
     synchronized (this) { lx = x; ly = y; }
     g.drawRect(lx, ly, 10, 10);
   }
}