import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Isetoo extends Applet implements MouseMotionListener, MouseListener {

    private PThread thread = null;
    private int x = 0;
    private int y = 0;
    private int mx = 0;
    private int my = 0;
    private int md = 0;
    private boolean doPaint = false;

    public Isetoo() {
        addMouseMotionListener(this);
        addMouseListener(this);
        thread = new PThread(this);
        thread.start();
    }

    public void paint(Graphics g) {
        if(doPaint) {
            mx = (int) (Math.random() * 10);
            my = (int) (Math.random() * 10);
            md = (int) (Math.random() * 20);
            if((Math.random()*100)>50) {
                mx=mx-mx*2;
            }
            if((Math.random()*100)<50) {
                my=my-my*2;
            }
            g.setColor(new Color((int) (Math.random() * 255), (int) (Math.random() * 255), (int) (Math.random() * 255)));
            g.drawOval(x + mx, y + my, md, md);
        }
    }

    class PThread extends Thread {
        Isetoo parent = null;
        public PThread(Isetoo par) {
            parent = par;
        }
        public void run() {
            while (true) {
                parent.repaint();
                try { Thread.sleep(100);} catch (Exception e) {}
            }
        }
    }
   

    public void mouseDragged(MouseEvent e){}
    public void mouseMoved(MouseEvent e) {
        x = e.getX();
        y = e.getY();
    }
    public void mouseClicked(MouseEvent e){}
    public void mousePressed(MouseEvent e){}
    public void mouseReleased(MouseEvent e){}
    public void mouseEntered(MouseEvent e){
       doPaint = true;
    }
    public void mouseExited(MouseEvent e){
        doPaint = false;
    }
 public static void main(String[] argumendid) {
        JFrame f = new JFrame();
        f.getContentPane().add(new Isetoo());
        f.setSize(300, 300);
        f.setVisible(true);
    }
}