Miscellany

import java.awt.*;
import java.util.Random;
import java.applet.Applet;

public class SimpleGame extends Applet implements Runnable {
        public int x;
        public int y;
        public int color;
        public void init() {
                setBackground(Color.black);
        }

        public void start() {
                Thread current = new Thread(this);
                current.start();
        }

        public void run() {
                Random rand = new Random();
                try {
                        while (true) {
                                color = (rand.nextInt(3) % 3);
                                x = rand.nextInt(300);
                                y = rand.nextInt(300);
                                Thread.sleep(300);
                                repaint();
                        }
                } catch (Exception e) {}
        }
        public void mouseClicked(Event e, int x, int y) {}
        public void paint(Graphics g) {
                switch (color) {
                        case 0: g.setColor(Color.green); break;
                        case 1: g.setColor(Color.red); break;
                        case 2: g.setColor(Color.yellow); break;
                }
                g.fillOval(x,y,20,20);
        }
}