Fanook

package test;import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.util.Random;class Circle extends Rectangle {   public Circle (int x, int y, int r) {      super(x - r, y - r, r * 2, r * 2);   }   public void draw (Graphics g) {      g.setColor(Color.BLACK);      g.fillRect(x, y, width, height);   }}class Vector{   public int xCom;   public int yCom;      public Vector(int x, int y) {      xCom = x;      yCom = y;   }}public class Bounce extends JPanel implements Runnable, ActionListener {   private Circle ball;   JFrame f;   Random r;   Vector v;   Timer t;      public Bounce () {      super();      f = new JFrame("Bounce");      ball = new Circle(50, 50, 5);      r = new Random(System.nanoTime());      v = new Vector(1,1);   }   public void paintComponent (Graphics g) {      ball.draw(g);   }   public void run () {      this.setPreferredSize(new Dimension(100, 100));      f.setContentPane(this);      f.pack();      f.setVisible(true);      t = new Timer(10, this);      t.start();   }   private void update () {      ball.x += v.xCom;      ball.y += v.yCom;      if(ball.x >= this.getWidth()-ball.width || ball.x <= ball.width)         v.xCom = -v.xCom;      if(ball.y >= this.getHeight()-ball.height || ball.y <= ball.height)         v.yCom = -v.yCom;   }   public void actionPerformed (ActionEvent e) {      update();      f.repaint();   }   public static void main (String [] args) {      SwingUtilities.invokeLater(new Bounce());   }}