sentially in this exercise the world contains a snake (or worm) as shown in the

Question

sentially in this exercise the world contains a snake (or worm) as shown in the picture below. The head is marked in blue, the rest of the body is in red. The snake moves in the direction of the head in one of four directions: north, east, south and west. As the snake moves you can change its direction of movement in real time by pressing the right key. The following table summarizes that information:

pressing this key (or keys) will set the direction of movement to 8 (or up-arrow) north 6 (or right-arrow) east 2 (or down-arrow) south 4 (or left-arrow) west 5 will cause the snake to stop

Explanation / Answer

The program for snake game application in java

Just create a snakegame package in java and add the following two java files

also add bluedot and reddot png files and try to replace the location in the following code

Board .java

package snakegame;

import java.awt.Color;
import java.awt.Dimension;
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 B_WIDTH = 300;
private final int B_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 final int x[] = new int[ALL_DOTS];
private final int y[] = new int[ALL_DOTS];

private int dots;
private int apple_x;
private int apple_y;

private boolean leftDirection = false;
private boolean rightDirection = true;
private boolean upDirection = false;
private boolean downDirection = 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);
setFocusable(true);

setPreferredSize(new Dimension(B_WIDTH, B_HEIGHT));
loadImages();
initGame();
}

private void loadImages() {

ImageIcon iid = new ImageIcon("D:\aqua\chegg\src\snakegame eddot.png"); // add your downloaded image path
ball = iid.getImage();

ImageIcon iia = new ImageIcon("D:\aqua\chegg\src\snakegame eddot.png"); // add your downloaded image path
apple = iia.getImage();

ImageIcon iih = new ImageIcon("D:\aqua\chegg\src\snakegame\bluedot.png");// add your downloaded image path
head = iih.getImage();
}

private 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();
}

@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);

doDrawing(g);
}
  
private void doDrawing(Graphics 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();

} else {

gameOver(g);
}   
}

private void gameOver(Graphics g) {
  
String msg = "Game Over";
Font small = new Font("Helvetica", Font.BOLD, 14);
FontMetrics metr = getFontMetrics(small);

g.setColor(Color.white);
g.setFont(small);
g.drawString(msg, (B_WIDTH - metr.stringWidth(msg)) / 2, B_HEIGHT / 2);
}

private void checkApple() {

if ((x[0] == apple_x) && (y[0] == apple_y)) {

dots++;
locateApple();
}
}

private void move() {

for (int z = dots; z > 0; z--) {
x[z] = x[(z - 1)];
y[z] = y[(z - 1)];
}

if (leftDirection) {
x[0] -= DOT_SIZE;
}

if (rightDirection) {
x[0] += DOT_SIZE;
}

if (upDirection) {
y[0] -= DOT_SIZE;
}

if (downDirection) {
y[0] += DOT_SIZE;
}
}

private 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] >= B_HEIGHT) {
inGame = false;
}

if (y[0] < 0) {
inGame = false;
}

if (x[0] >= B_WIDTH) {
inGame = false;
}

if (x[0] < 0) {
inGame = false;
}
  
if(!inGame) {
timer.stop();
}
}

private 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));
}

@Override
public void actionPerformed(ActionEvent e) {

if (inGame) {

checkApple();
checkCollision();
move();
}

repaint();
}

private class TAdapter extends KeyAdapter {

@Override
public void keyPressed(KeyEvent e) {

int key = e.getKeyCode();

if ((key == KeyEvent.VK_LEFT) && (!rightDirection)) {
leftDirection = true;
upDirection = false;
downDirection = false;
}

if ((key == KeyEvent.VK_RIGHT) && (!leftDirection)) {
rightDirection = true;
upDirection = false;
downDirection = false;
}

if ((key == KeyEvent.VK_UP) && (!downDirection)) {
upDirection = true;
rightDirection = false;
leftDirection = false;
}

if ((key == KeyEvent.VK_DOWN) && (!upDirection)) {
downDirection = true;
rightDirection = false;
leftDirection = false;
}
}
}
}

Snake .java

package snakegame;

import java.awt.EventQueue;
import javax.swing.JFrame;

public class Snake extends JFrame {

public Snake() {

add(new Board());
  
setResizable(false);
pack();
  
setTitle("Snake");
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
  

public static void main(String[] args) {
  
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {   
JFrame ex = new Snake();
ex.setVisible(true);   
}
});
}
}

note : need to add bluedot png and reddot png files

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