Jumping ball implement with java program

Code

Save this file BounceThread.java

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import java.awt.Container;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class BounceThread {

  public static void main(String[] args) {

    JFrame frame = new BounceThreadFrame();

    frame.show();

  }

}

class BounceThreadFrame extends JFrame {

  public BounceThreadFrame() {

    setSize(300, 200);

    setTitle("Bounce");

    addWindowListener(new WindowAdapter() {

      public void windowClosing(WindowEvent e) {

        System.exit(0);

      }

    });

    Container contentPane = getContentPane();

    canvas = new JPanel();

    contentPane.add(canvas, "Center");

    JPanel p = new JPanel();

    addButton(p, "Start", new ActionListener() {

      public void actionPerformed(ActionEvent evt) {

        Ball b = new Ball(canvas);

        b.start();

      }

    });

    addButton(p, "Close", new ActionListener() {

      public void actionPerformed(ActionEvent evt) {

        canvas.setVisible(false);

        System.exit(0);

      }

    });

    contentPane.add(p, "South");

  }

  public void addButton(Container c, String title, ActionListener a) {

    JButton b = new JButton(title);

    c.add(b);

    b.addActionListener(a);

  }

  private JPanel canvas;

}

class Ball extends Thread {

  public Ball(JPanel b) {

    box = b;

  }

  public void draw() {

    Graphics g = box.getGraphics();

    g.fillOval(x, y, XSIZE, YSIZE);

    g.dispose();

  }

  public void move() {

    if (!box.isVisible())

      return;

    Graphics g = box.getGraphics();

    g.setXORMode(box.getBackground());

    g.fillOval(x, y, XSIZE, YSIZE);

    x += dx;

    y += dy;

    Dimension d = box.getSize();

    if (x < 0) {

      x = 0;

      dx = -dx;

    }

    if (x + XSIZE >= d.width) {

      x = d.width - XSIZE;

      dx = -dx;

    }

    if (y < 0) {

      y = 0;

      dy = -dy;

    }

    if (y + YSIZE >= d.height) {

      y = d.height - YSIZE;

      dy = -dy;

    }

    g.fillOval(x, y, XSIZE, YSIZE);

    g.dispose();

  }

  public void run() {

    try {

      draw();

      for (int i = 1; i <= 1000; i++) {

        move();

        sleep(5);

      }

    } catch (InterruptedException e) {

    }

  }

  private JPanel box;

  private static final int XSIZE = 10;

  private static final int YSIZE = 10;

  private int x = 0;

  private int y = 0;

  private int dx = 2;

  private int dy = 2;

}………………………………………………………………………………………

compile it : javac BounceThread.java

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Run it: java  BounceThread

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Output: