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Simple 2D arcade game in java with source code

Today we are going to see how to create a sample classic arcade video game using only a sample code of java. The object of the game (mini project) is to prevent the ball from falling while moving the cursor left or right. the score increase by +1 point in every touch and best score is displayed when the red ball falls. i have also made a challenge by activating another black ball, the user should avoid it or the game is over. in every +10 point the speed increase x2 to make the game difficult. 

Source Code

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.Timer;
import javax.swing.WindowConstants;

public class RedBall extends JComponent implements ActionListener, MouseMotionListener, KeyListener {

    private int ballx = 150;
    private int bally = 30;
    private int ballx1 = 100;
    private int bally1 = 10;
    private int paddlex = 0;
    private int ballySpeed = 7;
    private int ballxSpeed = 5;
    private int bally1Speed = 14;
    private int ballx1Speed = 10;
    public int score = 0;
    public int score1 = 0;
    private int scorefinal;
    public int bestscore;
    public int bestscore1;
    public boolean gameOver, started;

    public static void main(String[] args) {

        JFrame wind = new JFrame("RedBall/GamePinfo");
        RedBall g = new RedBall();
        wind.add(g);
        wind.pack();
        wind.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        wind.setLocationRelativeTo(null);
        wind.setVisible(true);
        wind.addMouseMotionListener(g);

        Timer tt = new Timer(17, g);
        tt.start();

    }

    public void newball(int ballx, int bally, int ballxspeed, int ballyspeed) {

        ballx = 150;
        bally = 30;
        ballxspeed = 5;
        ballyspeed = 7;
        JOptionPane.showMessageDialog(null, "new ball !");

        return;
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(800, 600);
    }

    @Override
    protected void paintComponent(Graphics g) {

        //draw the sky
        g.setColor(Color.cyan);
        g.fillRect(0, 0, 800, 600);

        g.setColor(Color.GREEN);
        g.fillRect(0, 550, 800, 100);

        //draw the paddel
        g.setColor(Color.black);
        g.fillRect(paddlex, 500, 100, 20);

        //draw the ball
        g.setColor(Color.RED);
        g.fillOval(ballx, bally, 30, 30);

        //draw the ball_1
        if (score >= 5) {
            g.setColor(Color.BLACK);
            g.fillOval(ballx1, bally1, 30, 30);

        }
        //score 
        if (score >= 5) {
            g.setColor(Color.red);
            g.setFont(new Font("Arial", 8, 50));
            g.drawString(String.valueOf(score + score1), 30 / 1 - 15, 80);
        } else {
            g.setColor(Color.white);
            g.setFont(new Font("Arial", 8, 50));
            g.drawString(String.valueOf(score), 30 / 1 - 15, 80);
        }
        // start && gameOver
        g.setColor(Color.white);
        g.setFont(new Font("Arial", 8, 50));

        if (gameOver) {
            g.drawString(String.valueOf(" Best Score :" + scorefinal), 50 / 1 - 15, 200);
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        ballx = ballx + ballxSpeed;
        bally = bally + ballySpeed;

        // Window Down 
        if (ballx >= paddlex && ballx <= paddlex + 100 && bally >= 475) {
            ballySpeed = -7;
            score++;
        }

        if (bally >= 700 ) {
            score = 0;
            bally = 30;
            gameOver = true;
        }

        // Window up
        if (bally <= 0) {
            ballySpeed = 7;
        }

        // Window right
        if (ballx >= 775) {
            ballxSpeed = -5;
        }

        // Window left
        if (ballx <= 0) {
            ballxSpeed = 5;
        }

        //**********************************************************************
        ballx1 = ballx1 + ballx1Speed;
        bally1 = bally1 + bally1Speed;

        // Window down
        if (ballx1 >= paddlex && ballx1 <= paddlex + 100 && bally1 >= 475) {
            bally1Speed = -14;
            score1++;
        }

        if (bally1 >= 700) {
            score1 = 0;
            bally1 = 10;
        }

        // Window up
        if (bally1 <= 0) {
            bally1Speed = 14;
        }

        // Window right
        if (ballx1 >= 775) {
            ballx1Speed = -10;
        }

        // Window left
        if (ballx1 <= 0) {
            ballx1Speed = 10;
        }

        //**********************************************************************
        bestscore = score;
        bestscore1 = score1;

        if (scorefinal > bestscore) {
            scorefinal = scorefinal;
        } else {
            scorefinal = bestscore1;
            scorefinal = score + score1;
        }
        
        if (scorefinal > bestscore) {
            scorefinal = scorefinal;
        } else {
            scorefinal = bestscore;
            scorefinal = score + score1;
        }
        repaint();
    }

    @Override
    public void mouseMoved(MouseEvent e) {

        paddlex = e.getX() - 50;
        repaint();
    }

    @Override
    public void mouseDragged(MouseEvent e) {
    }

    @Override
    public void keyTyped(KeyEvent e) {
    }

    @Override
    public void keyPressed(KeyEvent e) {
    }

    @Override
    public void keyReleased(KeyEvent e) {
    }

}

PS : The Game is not completed and there’s some errors in code !