Snake Game using JAVA 

Here is the link to play the game in your pc.

https://www.mediafire.com/file/5avqwkgnjxl58zt/snake.jar/file

Source Code: 

import java.awt.*;

import java.awt.event.*;

import java.util.ArrayList;

import java.util.Random;

import javax.swing.*;

public class SnakeGame extends JPanel implements ActionListener, KeyListener{

    private class Tile{

        int x;

        int y;

        Tile(int x, int y){

            this.x = x;

            this.y = y;

        }

    }

    int boardHeight;

    int boardWidth;

    int tileSize = 25;

    //snake

    Tile snakeHead;

    ArrayList<Tile> snakeBody;

    //

    Tile food;

    Random random;

    //game logic

    Timer gameLoop;

    int VelocityX;

    int VelocityY;

    boolean gameOver = false;

    SnakeGame(int boardHeight, int boardWidth){

        this.boardHeight = boardHeight;

        this.boardWidth = boardWidth;

        setPreferredSize(new Dimension(this.boardHeight,this.boardWidth));

        setBackground(Color.black);

        addKeyListener(this);

        setFocusable(true);

        snakeHead = new Tile(5,5);

        snakeBody = new ArrayList<Tile>();

        food = new Tile(10, 10);

        random = new Random();

        placeFood();

        VelocityX = 0;

        VelocityY = 0;

        gameLoop = new Timer(100, this);

        gameLoop.start();

    }

    public void paintComponent(Graphics g) {

        super.paintComponent(g);

        draw(g);

    }

    public void draw(Graphics g){

        // //Grid

        // for(int i = 0; i<boardWidth/tileSize; i++){

        //     //x1,y1,x2,y2

        //     g.drawLine(i*tileSize,0,i*tileSize,boardHeight);

        //     g.drawLine(0,i*tileSize,boardWidth,i*tileSize);

           

        // }

        //food

        g.setColor(Color.RED);

        // g.fillRect(food.x*tileSize, food.y*tileSize, tileSize, tileSize);

        g.fill3DRect(food.x*tileSize, food.y*tileSize, tileSize, tileSize,true);

        //snake head

        g.setColor(Color.green);

        // g.fillRect(snakeHead.x*tileSize, snakeHead.y*tileSize, tileSize, tileSize);

        g.fill3DRect(snakeHead.x*tileSize, snakeHead.y*tileSize, tileSize, tileSize, true);

        //snake body

        for(int i = 0; i<snakeBody.size(); i++){

            Tile snakePart = snakeBody.get(i);

            // g.fillRect(snakePart.x * tileSize, snakePart.y * tileSize, tileSize, tileSize);

            g.fill3DRect(snakePart.x * tileSize, snakePart.y * tileSize, tileSize, tileSize,true);

        }

        //score

        g.setFont(new Font("Arial", Font.PLAIN, 16));

        if(gameOver){

            g.setColor(Color.red);

            g.drawString("Game Over: "+ String.valueOf(snakeBody.size()), tileSize - 16, tileSize);

        }

        else{

            g.drawString("Score: " + String.valueOf(snakeBody.size()), tileSize-16, tileSize);

        }

    }

    public void placeFood(){

        food.x = random.nextInt(boardWidth/tileSize);//600/25 = 24

        food.y = random.nextInt(boardHeight/tileSize);

    }

    public boolean collision(Tile tile1, Tile tile2) {

        return tile1.x == tile2.x && tile1.y == tile2.y;

    }

    public void move(){

        //eat food

        if(collision(snakeHead, food)) {

            snakeBody.add(new Tile(food.x, food.y));

            placeFood();

        }

        //snake body

        for(int i = snakeBody.size()-1; i>=0; i--){

            Tile snakePart = snakeBody.get(i);

            if(i == 0){

                snakePart.x = snakeHead.x;

                snakePart.y = snakeHead.y;

            }

            else{

                Tile prevSnakePart = snakeBody.get(i-1);

                snakePart.x = prevSnakePart.x;

                snakePart.y = prevSnakePart.y;

            }

        }

        //snakeHead

        snakeHead.x += VelocityX;

        snakeHead.y += VelocityY;

        //game over conditions

        for(int i = 0; i<snakeBody.size(); i++){

            Tile snakePart = snakeBody.get(i);

            //collide with snake head

            if(collision(snakeHead, snakePart)){

                gameOver = true;

            }

        }

        if(snakeHead.x*tileSize < 0 || snakeHead.x*tileSize > boardWidth || snakeHead.y < 0 || snakeHead.y > boardHeight){

            gameOver = true;

        }

    }

    @Override

    public void actionPerformed(ActionEvent e) {

        move();

        repaint();

        if(gameOver){

            gameLoop.stop();

        }

    }

    @Override

    public void keyPressed(KeyEvent e) {

        if(e.getKeyCode() == KeyEvent.VK_UP && VelocityY != 1){

            VelocityX = 0;

            VelocityY = -1;

        }

        else if(e.getKeyCode() == KeyEvent.VK_DOWN && VelocityY != -1){

            VelocityX = 0;

            VelocityY = 1;

        }

        else if(e.getKeyCode() == KeyEvent.VK_LEFT && VelocityX != 1){

            VelocityX = -1;

            VelocityY = 0;

        }

        else if(e.getKeyCode() == KeyEvent.VK_RIGHT && VelocityX != -1){

            VelocityX = 1;

            VelocityY = 0;

        }

    }

    // we dont need this code below

    @Override

    public void keyReleased(KeyEvent e) {}

    @Override

    public void keyTyped(KeyEvent e) {}

}