Using RMI, program a PONG game that enables two users to play against one another.

Pong class:

package graphics;/*
* Copyright (c) 2006, Your Corporation. All Rights Reserved.
*/

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class Pong extends JApplet
        implements Runnable, MouseMotionListener, MouseListener {

    Thread runner;
    Image offscreeni;
    Graphics offscreeng;
    Rectangle plane;
    Point ballPoint, racketPoint, enemyPoint, ballSpeed;
    boolean start, death = false;
    int playerScore, enemyScore = 0;
    int tuffHit = 8;

    public void init() {
        addMouseListener(this);
        addMouseMotionListener(this);
        final int width = this.getSize().width;
        final int height = this.getSize().height;
        offscreeni = createImage(width, height);
        offscreeng = offscreeni.getGraphics();
        setBackground(Color.black);
        ballPoint = new Point((width / 2), (height / 2));
        racketPoint = new Point((width - 35), ((height / 2) - 25));
        enemyPoint = new Point(35, ((height / 2) - 25));
        plane = new Rectangle(15, 15, width, (height - 30));
        ballSpeed = new Point(0, 0);
        repaint();
    }

    public void start() {
        if (runner == null) {
            runner = new Thread(this);
            runner.start();
        }
    }

    public void run() {
        while (true) {
            checkRacket();
            checkEnemy();
            checkWalls();
            moveBall();
           moveEnemy(enemyPoint.y + 25);
            repaint();
            sleep();
        }

    }

    private void sleep() {
        try {
            Thread.sleep(35);
            //lower this number to improve speed.
        }
        catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    void moveBall() {
        ballPoint.x = (ballPoint.x + ballSpeed.x);
        ballPoint.y = (ballPoint.y + ballSpeed.y);
    }

    void moveEnemy(int enemyPos) {
        int dist = Math.abs(ballPoint.y - enemyPos);
        final int y = enemyPoint.y;
        if (ballSpeed.x < 0) {
            if (enemyPos < (ballPoint.y - 3)) enemyPoint.y = (y + dist / tuffHit);
            else if (enemyPos > (ballPoint.y + 3)) enemyPoint.y = (y - dist / tuffHit);
        } else {
            if (enemyPos < (this.getSize().height / 2 - 3))
                enemyPoint.y = (y + 2);
            else if (enemyPos > (this.getSize().height / 2 + 3))
                enemyPoint.y = (y - 2);
        }
    }

    void checkRacket() {
        if (ballSpeed.x < 0) return;

        if ((ballPoint.x + ballSpeed.x) >= racketPoint.x - 6 &
                (ballPoint.x < racketPoint.x))
            if ((ballPoint.y + 8) > racketPoint.y & ballPoint.y < (racketPoint.y + 50)) {
                int racketHit = (ballPoint.y - (racketPoint.y + 25));
                ballSpeed.y = (ballSpeed.y + (racketHit / 7));
                ballSpeed.x = (ballSpeed.x * -1);
            }
    }

    void checkEnemy() {
        if (ballSpeed.x > 0) return;
        if ((ballPoint.x + ballSpeed.x) <= enemyPoint.x + 4 & (ballPoint.x > enemyPoint.x))
            if ((ballPoint.y + 8) > enemyPoint.y & ballPoint.y < (enemyPoint.y + 50)) {
                int racketHit = (ballPoint.y - (enemyPoint.y + 25));
                ballSpeed.y = (ballSpeed.y + (racketHit / 7));
                ballSpeed.x = (ballSpeed.x * -1);
            }
    }

    void checkWalls() {
        final int x = ballSpeed.x;
        if ((ballPoint.x + x) <= plane.x) miss();

        if ((ballPoint.x + x) >= (plane.width - 20)) miss();
        final int y = ballSpeed.y;
        if ((ballPoint.y + y) <= plane.y) ballSpeed.y = (y * -1);
        if ((ballPoint.y + y) >= (plane.height + 8)) ballSpeed.y = (y * -1);

    }

    void miss() {
        if (ballSpeed.x < 0) {
            playerScore = (playerScore + 1);
            if (tuffHit > 2) tuffHit = (tuffHit - 1);
        } else enemyScore = (enemyScore + 1);
        ballSpeed.x = (ballSpeed.x * -1);
        ballPoint.x = (ballPoint.x + ballSpeed.x);

        for (int i = 3; i > 0; i = (i - 1)) {
            death = true;
            repaint();
            try {
                Thread.sleep(300);
            }
            catch (InterruptedException e) {
                e.printStackTrace();
            }
            death = false;
            repaint();
            try {
                Thread.sleep(300);
            }
            catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        ballPoint = new Point((this.getSize().width / 2),
                (this.getSize().height / 2));
        ballSpeed.x = 0;
        ballSpeed.y = 0;
        start = false;

    }

    public void update(Graphics g) {
        paint(g);
    }

    public void paint(Graphics g) {
        offscreeng.setColor(Color.black);
        offscreeng.fillRect(0, 0, this.getSize().width, this.getSize().height);

        if (!death) offscreeng.setColor(Color.white);
        else offscreeng.setColor(Color.lightGray);
        offscreeng.drawString(Integer.toString(enemyScore), 100, 35);
        offscreeng.drawString(Integer.toString(playerScore), 215, 35);
        offscreeng.clipRect(plane.x, plane.y, plane.width - 28, plane.height + 1);
        offscreeng.drawRect(plane.x, plane.y, plane.width - 30, plane.height);
        offscreeng.fillRect(racketPoint.x, racketPoint.y, 6, 50);
        offscreeng.fillRect(enemyPoint.x, enemyPoint.y, 6, 50);
        offscreeng.fillOval(ballPoint.x, ballPoint.y, 8, 8);
        g.drawImage(offscreeni, 0, 0, this);

    }

    public void mouseDragged(MouseEvent e) {
        //To change body of implemented methods use File | Settings | File Templates.
    }

    public void mouseMoved(MouseEvent e) {
            racketPoint.y = (e.getY() - 25);
            repaint();
    }

    public void mouseClicked(MouseEvent e) {
        //To change body of implemented methods use File | Settings | File Templates.
    }

    public void mousePressed(MouseEvent e) {
        //To change body of implemented methods use File | Settings | File Templates.
    }

    public void mouseReleased(MouseEvent e) {
         if (!start) {
            ballSpeed.x = 4;
            ballSpeed.y = 2;
            start = true;
        }
    }

    public void mouseEntered(MouseEvent e) {
        //To change body of implemented methods use File | Settings | File Templates.
    }

    public void mouseExited(MouseEvent e) {
        //To change body of implemented methods use File | Settings | File Templates.
    }
}