Arkanoid game made with java

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Source code:

package com.javatmz.javaapp.arkanoid;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
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.util.ArrayList;
import java.util.List;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.Timer;
public class ArkanoidGameApp extends JFrame {
	private static final int D_W = 1000;
	private static final int D_H = 700;
	DrawPanel drawPanel = new DrawPanel();
	Block[] block = new Block[2000];
	int n = 0;
	int dx = 6, dy = 5;
	int dR = 300;
	int xBall = 300, yBall = 300;
	boolean gameOver = false;
	int i=0;
	public ArkanoidGameApp() {
		add(drawPanel);
		pack();
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setLocationRelativeTo(null);
		setVisible(true);
		for (int i = 1; i <= 20; i++) {
			for (int j = 2; j <= 10; j++) {
				block[n] = new Block();
				block[n].x = i * 43;
				block[n].y = j * 20;
				n++;
			}
		}
		ActionListener listener = new AbstractAction() {
			public void actionPerformed(ActionEvent e) {
				if (!gameOver) {
					if (yBall > 660) {
						gameOver = true;
					}
					if (yBall < 0) {
						dy = 7;
					}
					// dx += dx;
					xBall += dx;
					if (xBall > 900)
						dx = -6;
					if (xBall < 40)
						dx = 6;
					// dy += dy;
					yBall += dy;
					for (int i = 0; i < n; i++) {
						if (isBlockCollide(block[i])) {
							block[i].x = -100;
							dy = +7;
						}
					}
					if (isPaddleCollide()) {
						dy = -7;
					}
				}
				drawPanel.repaint();
			}
		};
		Timer timer = new Timer(50, listener);
		timer.start();
	}
	boolean isBlockCollide(Block block) {
		if (yBall >= block.y && yBall < block.y + 20 && xBall > block.x && xBall < block.x + 43) {
			i++;
			return true;
		}
		return false;
	}
	boolean isPaddleCollide() {
		if (xBall+20 > dR && xBall < dR + 100 && yBall >= 620 && yBall < 720 ) {
			return true;
		}
		return false;
	}
	private class DrawPanel extends JPanel {
		public DrawPanel() {
			InputMap inputMap = getInputMap(WHEN_IN_FOCUSED_WINDOW);
			ActionMap actionMap = getActionMap();
			String VK_LEFT = "VK_LEFT";
			KeyStroke W = KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0);
			inputMap.put(W, VK_LEFT);
			actionMap.put(VK_LEFT, new AbstractAction() {
				@Override
				public void actionPerformed(ActionEvent e) { 
					dR = dR - 15;
				}
			});
			String VK_RIGHT = "VK_RIGHT";
			KeyStroke WVK_RIGHT = KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0);
			inputMap.put(WVK_RIGHT, VK_RIGHT);
			actionMap.put(VK_RIGHT, new AbstractAction() {
				@Override
				public void actionPerformed(ActionEvent e) {
					dR = dR + 15;
				}
			});
		}
		protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			
			
			Graphics gBall = g;
			gBall.setColor(Color.black);
			gBall.fillOval(xBall, yBall, 40, 40);
			
			if (gameOver) {
				g.setFont(new Font("MyFont", 20, 20));
				g.drawString("Oops Game Over", 300, 300);
			}
			
				g.setFont(new Font("MyFont", 20, 20));
				g.drawString("your score : "+i, 20, 20);
			
			
			Graphics gPaddle = g;
			gPaddle.setColor(Color.blue);
			int xR = dR;
			if (xR > 940)
				xR = 900;
			if (xR < 0)
				xR = 0;
			gPaddle.fillRect(xR, 650, 100, 20);
			
			Graphics gBlock = g;
			for (int i = 0; i < n; i++) {
				gBlock.setColor(Color.orange);
				gBall.fillRect(block[i].x, block[i].y, 43, 20);
				gBlock.setColor(Color.red);
				gBall.drawRect(block[i].x, block[i].y, 43, 20);
			}
			
		
		}
		public Dimension getPreferredSize() {
			return new Dimension(D_W, D_H);
		}
	}
	private class Block {
		int x;
		int y;
	}
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			@Override
			public void run() {
				new ArkanoidGameApp();
			}
		});
	}
}