import javax.swing.JFrame;
 
	public class snake extends JFrame {
 
	public snake() {
 
	add(new Board());
 
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setSize(320, 340);
	setLocationRelativeTo(null);
	setTitle("Snake");
 
	setResizable(false);
	setVisible(true);
	}
 
	public static void main(String[] args) {
	new Snake();
	}
	}
	This is Board.java file:
 
	import java.awt.Color;
	import java.awt.Font;
	import java.awt.FontMetrics;
	import java.awt.Graphics;
	import java.awt.Image;
	import java.awt.Toolkit;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;
	import java.awt.event.KeyAdapter;
	import java.awt.event.KeyEvent;
 
	import javax.swing.ImageIcon;
	import javax.swing.JPanel;
	import javax.swing.Timer;
 
 
	public class Board extends JPanel implements ActionListener {
 
	private final int WIDTH = 300;
	private final int HEIGHT = 300;
	private final int DOT_SIZE = 10;
	private final int ALL_DOTS = 900;
	private final int RAND_POS = 29;
	private final int DELAY = 140;
 
	private int x[] = new int[ALL_DOTS];
	private int y[] = new int[ALL_DOTS];
 
	private int dots;
	private int apple_x;
	private int apple_y;
 
	private boolean left = false;
	private boolean right = true;
	private boolean up = false;
	private boolean down = false;
	private boolean inGame = true;
 
	private Timer timer;
	private Image ball;
	private Image apple;
	private Image head;
 
 
	public Board() {
	addKeyListener(new TAdapter());
 
	setBackground(Color.black);
 
	ImageIcon iid = new ImageIcon(this.getClass().getResource("dot.png"));
	ball = iid.getImage();
 
	ImageIcon iia = new ImageIcon(this.getClass().getResource("apple.png"));
	apple = iia.getImage();
 
	ImageIcon iih = new ImageIcon(this.getClass().getResource("head.png"));
	head = iih.getImage();
 
	setFocusable(true);
	initGame();
	}
 
 
	public void initGame() {
 
	dots = 3;
 
	for (int z = 0; z < dots; z++) {
	x[z] = 50 - z*10;
	y[z] = 50;
	}
 
	locateApple();
 
	timer = new Timer(DELAY, this);
	timer.start();
	}
 
 
	public void paint(Graphics g) {
	super.paint(g);
 
	if (inGame) {
 
	g.drawImage(apple, apple_x, apple_y, this);
 
	for (int z = 0; z < dots; z++) {
	if (z == 0)
	g.drawImage(head, x[z], y[z], this);
	else g.drawImage(ball, x[z], y[z], this);
	}
 
	Toolkit.getDefaultToolkit().sync();
	g.dispose();
 
	} else {
	gameOver(g);
	}
	}
 
 
	public void gameOver(Graphics g) {
	String msg = "Game Over";
	Font small = new Font("Helvetica", Font.BOLD, 14);
	FontMetrics metr = this.getFontMetrics(small);
 
	g.setColor(Color.white);
	g.setFont(small);
	g.drawString(msg, (WIDTH - metr.stringWidth(msg)) / 2,
	HEIGHT / 2);
	}
	public void checkApple() {
 
	if ((x[0] == apple_x) && (y[0] == apple_y)) {
	dots++;
	locateApple();
	}
	}
 
 
	public void move() {
 
	for (int z = dots; z > 0; z--) {
	x[z] = x[(z - 1)];
	y[z] = y[(z - 1)];
	}
 
	if (left) {
	x[0] -= DOT_SIZE;
	}
 
	if (right) {
	x[0] += DOT_SIZE;
	}
 
	if (up) {
	y[0] -= DOT_SIZE;
	}
 
	if (down) {
	y[0] += DOT_SIZE;
	}
	}
 
 
	public void checkCollision() {
 
	for (int z = dots; z > 0; z--) {
 
	if ((z > 4) && (x[0] == x[z]) && (y[0] == y[z])) {
	inGame = false;
	}
	}
 
	if (y[0] > HEIGHT) {
	inGame = false;
	}
 
	if (y[0] < 0) {
	inGame = false;
	}
 
	if (x[0] > WIDTH) {
	inGame = false;
	}
 
	if (x[0] < 0) {
	inGame = false;
	}
	}
 
	public void locateApple() {
	int r = (int) (Math.random() * RAND_POS);
	apple_x = ((r * DOT_SIZE));
	r = (int) (Math.random() * RAND_POS);
	apple_y = ((r * DOT_SIZE));
	}
 
	public void actionPerformed(ActionEvent e) {
 
	if (inGame) {
	checkApple();
	checkCollision();
	move();
	}
 
	repaint();
	}
 
 
	private class TAdapter extends KeyAdapter {
 
	public void keyPressed(KeyEvent e) {
 
	int key = e.getKeyCode();
 
	if ((key == KeyEvent.VK_LEFT) && (!right)) {
	left = true;
	up = false;
	down = false;
	}
 
	if ((key == KeyEvent.VK_RIGHT) && (!left)) {
	right = true;
	up = false;
	down = false;
	}
 
	if ((key == KeyEvent.VK_UP) && (!down)) {
	up = true;
	right = false;
	left = false;
	}
 
	if ((key == KeyEvent.VK_DOWN) && (!up)) {
	down = true;
	right = false;
	left = false;
	}
	}
	}
	}
 
}