package sample;
import java.awt.*;
public class MapGenerator
{
    public int map[][];
    public int brickWidth;
    public int brickHeight;
    public MapGenerator(int row, int col)
    {
        map = new int[row][col];
        for( int i = 0; i < map.length; i++)
        {
            for(int j = 0; j < map[0].length; j++)
            {
                map[i][j] = 1;
            }
        }
        brickWidth = 540 / col;
        brickHeight = 150 / row;
    }
    public void draw(Graphics2D g)
    {
        for( int i = 0; i < map.length; i++)
        {
            for (int j = 0; j < map[0].length; j++)
            {
                if (map[i][j] > 0)
                {
                    g.setColor(Color.black);
                    g.fillRect(j * brickWidth + 80, i * brickHeight + 50, brickWidth, brickHeight);
                }
            }
        }
    }
}

package sample;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class gameplay extends JPanel implements KeyListener, ActionListener
{
    private boolean play = false;
    private int score = 0;
    private int totalBricks = 21;
    private Timer timer;
    private int delay = 8;
    private int playerX = 310;
    private int ballposX = 500;
    private int ballposY = 350;
    private int ballXdir = -1;
    private int ballYdir = -2;
    private MapGenerator map;
    public gameplay()
    {
        map = new MapGenerator(3, 7);
        addKeyListener(this);
        setFocusable(true);
        setFocusTraversalKeysEnabled(false);
        timer = new Timer(delay, this);
        timer.start();
    }
    public void paint(Graphics g)
    {
        //background
        g.setColor(Color.GRAY);
        g.fillRect(1, 1, 692, 692);
        //drawing map
        map.draw((Graphics2D) g);
        //border
        g.setColor(Color.yellow);
        g.fillRect(0, 0, 5, 592);
        g.fillRect(0, 0, 692, 3);
        g.fillRect(691, 0, 3, 592);
        //paddle
        g.setColor(Color.GREEN);
        g.fillRect(playerX, 550, 100, 8);
        //ball
        g.setColor(Color.YELLOW);
        g.fillOval(ballposX, ballposY, 20, 20);
        g.dispose();
    }
    @Override
    public void actionPerformed(ActionEvent e)
    {
        timer.start();
        if (play)
        {
            if (new Rectangle(ballposX, ballposY, 20, 20).intersects(new Rectangle(playerX, 550, 100, 8)))
            {
                ballYdir = -ballYdir;
            }
            ballposX += ballXdir;
            ballposY += ballYdir;
            if (ballposX < 0)
            {
                ballXdir = -ballXdir;
            }
            if (ballposY < 0)
            {
                ballYdir = -ballYdir;
            }
            if (ballposX > 670)
            {
                ballXdir = -ballXdir;
            }
        }
        repaint();
    }
    @Override
    public void keyPressed(KeyEvent e)
    {
        if (e.getKeyCode() == KeyEvent.VK_RIGHT)
        {
            if (playerX >= 600)
            {
                playerX = 600;
            }
            else
            {
                moveRight();
            }
        }
        if (e.getKeyCode() == KeyEvent.VK_LEFT)
        {
            if (playerX < 10)
            {
                playerX = 10;
            }
            else
            {
                moveLeft();
            }
        }
    }
    public void moveRight()
    {
        play = true;
        playerX += 20;
    }
    public void moveLeft()
    {
        play = true;
        playerX -= 20;
    }
    @Override
    public void keyReleased(KeyEvent e) { }
    @Override
    public void keyTyped(KeyEvent e) { }
}

package sample;
import javax.swing.JFrame;
public class Main
{
    public static void main(String[] args)
    {
        JFrame obj = new JFrame();
        gameplay Gameplay = new gameplay();
        obj.setBounds(10, 10, 700, 600);
        obj.setTitle("Breakout Ball");
        obj.setResizable(false);
        obj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        obj.add(Gameplay);
        obj.setVisible(true);
    }
}

  brickWidth = 540/col;
brickWidth = 150/row;