Pong Game in Java

Today in this article I will show you how to make a Pong game in Java. I have made three classes in this game.

Pong game in Java

This is a two-player game in which players need to touch the ball with the paddle if the ball will not touch the paddle then the other player will get numbers and vice versa.

1. The Main class from which all things are controlled.
2. Ball class that draws the ball and also check its collision with the paddles.
3. Paddle class that draws the paddles and also move the paddles up and down.

 

Main Class

public class Ball implements Runnable {
    //Global variable
    int x, y, xDirection, yDirection;
    Rectangle ball;
    Paddle p1 = new Paddle(15, 140, 1); //paddle class objects
    Paddle p2 = new Paddle(770, 140, 2);
    //Score
    int p1Score, p2Score;
    //Ball Image
    Image BallImage;
    public Ball(int x, int y)
    {
        p1Score = p2Score = 0;
        this.x = x;
        this.y = y;
        Random r = new Random(); //creats Random numbers
        int rDir = r.nextInt(1);
        if (rDir == 0)
        {
            rDir--;
        }
        setXDirection(rDir);
        int yrDir = r.nextInt(1);
        if (yrDir == 0)
        {
            yrDir--;
        }
        setYDirection(yrDir);
        ball = new Rectangle(this.x, this.y, 15, 15);
    }
    //for set the xDirection of the ball
    public void setXDirection(int xdir)
    {
        xDirection = xdir;
    }
    //for set the yDirection of the ball
    public void setYDirection(int ydir)
    {
        yDirection = ydir;
    }
    public void draw(Graphics g)
    {
        java.net.URL urlBall = getClass().getResource("Ball.png"); //get ball image from the project folder
        BallImage = getImage(urlBall);
        g.drawImage(BallImage, this.ball.x, this.ball.y, null);
    }
    //Collision method
    public void collision()
    { //for paddle 1 collision
        if (ball.intersects(p1.paddle))
        {
            setXDirection(+1);
        }
        //for paddle 2 collision
        if (ball.intersects(p2.paddle))
        {
            setXDirection(-1);
        }
    }
    //Move method
    public void move()
    {
        collision();
        ball.x += xDirection;
        ball.y += yDirection;
        //Bounce the ball when edge is detected
        if (ball.x <= 0)
        {
            setXDirection(+1);
            p2Score++;
        }
        if (ball.x >= 785)
        {
            setXDirection(-1);
            p1Score++;
        }
        if (ball.y <= 0)
        {
            setYDirection(+1);
        }
        if (ball.y >= 485)
        {
            setYDirection(-1);
        }
    }
    //Run method Thread Start from here
    public void run()
    {
        try {
            while (true)
            {
                move();
                Thread.sleep(2);
            }
        } catch (Exception e)
        {
            System.err.println(e.getMessage());
        }
    }
}

Ball Class

public class Ball implements Runnable
{
    //Global variable
    int x, y, xDirection, yDirection;
    Rectangle ball;
    Paddle p1 = new Paddle(15, 140, 1); //paddle class objects
    Paddle p2 = new Paddle(770, 140, 2);
    //Score
    int p1Score, p2Score
    //Ball Image
    Image BallImage;
    public Ball(int x, int y)
    {
        p1Score = p2Score = 0;
        this.x = x;
        this.y = y;
        Random r = new Random(); //creats Random numbers
        int rDir = r.nextInt(1);
        if (rDir == 0)
        {
            rDir--;
        }
        setXDirection(rDir);
        int yrDir = r.nextInt(1);
        if (yrDir == 0)
        {
            yrDir--;
        }
        setYDirection(yrDir);
        ball = new Rectangle(this.x, this.y, 15, 15);
    }
    //for set the xDirection of the ball
    public void setXDirection(int xdir)
    {
        xDirection = xdir;
    }
    //for set the yDirection of the ball
    public void setYDirection(int ydir)
    {
        yDirection = ydir;
    }
    public void draw(Graphics g)
    {
        java.net.URL urlBall = getClass().getResource("Ball.png"); //get ball image from the project folder
        BallImage = getImage(urlBall);
        g.drawImage(BallImage, this.ball.x, this.ball.y, null);
    }
    //Collision method
    public void collision()
    {
        //for paddle 1 collision
        if (ball.intersects(p1.paddle))
        {
            setXDirection(+1);
        }
        //for paddle 2 collision
        if (ball.intersects(p2.paddle))
        {
            setXDirection(-1);
        }
    }
    //Move method
    public void move()
    {
        collision();
        ball.x += xDirection;
        ball.y += yDirection;
        //Bounce the ball when edge is detected
        if (ball.x <= 0)
        {
            setXDirection(+1);
            p2Score++;
        }
        if (ball.x >= 785)
        {
            setXDirection(-1);
            p1Score++;
        }
        if (ball.y <= 0)
        {
            setYDirection(+1);
        }
        if (ball.y >= 485)
        {
            setYDirection(-1);
        }
    }
    //Run method Thread Start from here
    public void run()
    {
        try {
            while (true)
            {
                move();
                Thread.sleep(2)
            }
        } catch (Exception e)
        {
            System.err.println(e.getMessage());
        }
    }
}

Paddle Class

public class Paddle implements Runnable
{
    //Global Variables
    int x, y, yDirection, id;
    Rectangle paddle;
    Image PaddleImage1;
    Image PaddleImage2;
    public Paddle(int x, int y, int id)
    {
        this.x = x;
        this.y = y;
        this.id = id;
        paddle = new Rectangle(x, y, 10, 80);
    }
    //Keypressed event function
    public void keyPressed(KeyEvent e)
    {
        switch (id)
        {
            //for Paddle 1
            case 1:
                if (e.getKeyCode() == e.VK_W)
                {
                    setYDirection(-1);
                }
                if (e.getKeyCode() == e.VK_S)
                {
                    setYDirection(1);
                }
                break;
                //for Paddle 2
            case 2:
                if (e.getKeyCode() == e.VK_UP)
                {
                    setYDirection(-1);
                }
                if (e.getKeyCode() == e.VK_DOWN)
                {
                    setYDirection(+1);
                }
                break;
            default:
                System.out.println("Enter correct id");
                break;
        }
    }
    public void keyReleased(KeyEvent e)
    {
        switch (id)
        {
            //for Paddle 1
            case 1:
                if (e.getKeyCode() == e.VK_W)
                {
                    setYDirection(0);
                }
                if (e.getKeyCode() == e.VK_S)
                {
                    setYDirection(0);
                }
                break;
                //for Paddle 2
            case 2:
                if (e.getKeyCode() == e.VK_UP)
                {
                    setYDirection(0);
                }
                if (e.getKeyCode() == e.VK_DOWN)
                {
                    setYDirection(0);
                }
                break;
            default:
                System.out.println("Enter correct id");
                break;
        }
    }
    public void setYDirection(int ydir)
    {
        yDirection = ydir;
    }
    public void move()
    {
        paddle.y += yDirection;
        if (paddle.y <= 30)
        {
            paddle.y = 30;
        }
        if (paddle.y >= 405)
        {
            paddle.y = 405;
        }
    }
    public void draw(Graphics g)
    {
        java.net.URL url1 = getClass().getResource("PaddleImage1.png"); //get image
        PaddleImage1 = getImage(url1);
        java.net.URL url2 = getClass().getResource("PaddleImage2.png");
        PaddleImage2 = getImage(url2);
        switch (id)
        {
            //for Paddle 1
            case 1:
                g.drawImage(PaddleImage1, this.paddle.x, this.paddle.y, null);
                break;
                //for Paddle 2
            case 2:
                g.drawImage(PaddleImage2, this.paddle.x, this.paddle.y, null);
                break;
            default:
                System.out.println("Enter correct id");
        }
    }
    @Override
    //Thread Start from here
    public void run()
    {
        try
        {
            while (true)
            {
                move();
                Thread.sleep(4);
            }
        } catch (Exception e)
        {
            System.err.println(e.getMessage());
        }
    }
}

I have also attached the source code and JAR file with it. So you can download it and run it on your PC.