I have downloaded a snake game project in java. Initially the project contains three java files i.e "

Engine.java

Snake.java

GameBoard.java

And Engine.java have the main() method, when i run this Engine.java class game starts running.

And to improve the user iteractivity i have created two JFrames :"PlayGame.java", Rules.java

Now this project having five java classes in this project-

Engine.java(containing main() method)
Snake.java
GameBoard.java
PlayGame.java(is a JFrame)
Rules.java(is a JFrame)

PlayGame.java have three buttons

Play - i want when play button getclicked snake game start/run.
Rules - when clicked Rules.java Jframe should be opened
Exit - exits the application

Now what i want is at first "PlayGame.java" JFrame should appear and throw this game should start i.e when I click play button game should start But problem I am facing on running theapplication 'PlayGame.java' Jframe displaying on the window but when I click 'play button' SnakeFrame appears but snake is not moving. So please give me solution so that I can make project in running state.

For better understandability of the prolem I am attachig some code in my question

Main() method code:



public static void main(String[] args) {
new PlayGame().setVisible(true);

/**JFrame frame = new JFrame("SnakeGame");
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOS E);
frame.setResizable(false);

Canvas canvas = new Canvas();
canvas.setBackground(Color.black);
canvas.setPreferredSize(new Dimension(GameBoard.MAP_SIZE * GameBoard.TILE_SIZE, GameBoard.MAP_SIZE * GameBoard.TILE_SIZE));

frame.getContentPane().add(canvas);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);

new Engine(canvas).startGame();*/


}


ActionPerformed() method of Play Button



private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

JFrame frame = new JFrame("SnakeGame");
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_C LOSE);
frame.setResizable(true);
Canvas canvas = new Canvas();
canvas.setBackground(Color.black);
canvas.setPreferredSize(new Dimension(GameBoard.MAP_SIZE * GameBoard.TILE_SIZE, GameBoard.MAP_SIZE * GameBoard.TILE_SIZE));

frame.getContentPane().add(canvas);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
new Engine(canvas).startGame();
}



And also I am attaching two classes which are major I this project or which involve the functioning of snake game

First is Engie.java



package org.psnbtech;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import org.psnbtech.GameBoard.TileType;
import org.psnbtech.Snake.Direction;


public class Engine extends KeyAdapter {

private static final int UPDATES_PER_SECOND = 15;

private static final Font FONT_SMALL = new Font("Arial", Font.BOLD, 20);

private static final Font FONT_LARGE = new Font("Arial", Font.BOLD, 40);

public Canvas canvas;

public GameBoard board;

public Snake snake;

public int score;

public boolean gameOver;


public Engine(Canvas canvas) {
this.canvas = canvas;
this.board = new GameBoard();
this.snake = new Snake(board);

resetGame();

canvas.addKeyListener(this);
//new Engine(canvas).startGame();
}


public void startGame() {
canvas.createBufferStrategy(2);

Graphics2D g = (Graphics2D)canvas.getBufferStrategy().getDrawGrap hics();
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING , RenderingHints.VALUE_ANTIALIAS_ON);

long start = 0L;
long sleepDuration = 0L;
while(true) {
start = System.currentTimeMillis();

update();
render(g);

canvas.getBufferStrategy().show();

g.clearRect(0, 0, canvas.getWidth(), canvas.getHeight());

sleepDuration = (1500L / UPDATES_PER_SECOND) - (System.currentTimeMillis() - start);

if(sleepDuration > 0) {
try {
Thread.sleep(sleepDuration);
} catch(Exception e) {
e.printStackTrace();
}
}
}
}

public void update() {
if(gameOver || !canvas.isFocusable()) {
return;
}
TileType snakeTile = snake.updateSnake();
if(snakeTile == null || snakeTile.equals(TileType.SNAKE)) {
gameOver = true;
} else if(snakeTile.equals(TileType.FRUIT)) {
score += 10;
spawnFruit();
}
}

public void render(Graphics2D g) {
board.draw(g);

g.setColor(Color.WHITE);

if(gameOver) {
g.setFont(FONT_LARGE);
String message = new String("Your Score: " + score);
g.drawString(message, canvas.getWidth() / 2 - (g.getFontMetrics().stringWidth(message) / 2), 250);

g.setFont(FONT_SMALL);
message = new String("Press Enter to Restart the Game");
g.drawString(message, canvas.getWidth() / 2 - (g.getFontMetrics().stringWidth(message) / 2), 350);
} else {
g.setFont(FONT_SMALL);
g.drawString("Score:" + score, 10, 20);
}
}

public void resetGame() {
board.resetBoard();
snake.resetSnake();
score = 0;
gameOver = false;
spawnFruit();
}

public void spawnFruit() {
int random = (int)(Math.random() * ((GameBoard.MAP_SIZE * GameBoard.MAP_SIZE) - snake.getSnakeLength())); // if '*' replace by '/' then only one fruit is there for snake

int emptyFound = 0;
int index = 0;
while(emptyFound < random) {
index++;
if(board.getTile(index % GameBoard.MAP_SIZE, index / GameBoard.MAP_SIZE).equals(TileType.EMPTY)) { // if '/' replaced by '*' then nothing displays on the board
emptyFound++;
}
}
board.setTile(index % GameBoard.MAP_SIZE, index / GameBoard.MAP_SIZE, TileType.FRUIT); // it also show nothing when replacing '/' by '/'
}

@Override
public void keyPressed(KeyEvent e) {
if((e.getKeyCode() == KeyEvent.VK_UP)||(e.getKeyCode() == KeyEvent.VK_W)) {
snake.setDirection(Direction.UP);
}
if((e.getKeyCode() == KeyEvent.VK_DOWN)||(e.getKeyCode() == KeyEvent.VK_S)) {
snake.setDirection(Direction.DOWN);
}
if((e.getKeyCode() == KeyEvent.VK_LEFT)||(e.getKeyCode() == KeyEvent.VK_A)) {
snake.setDirection(Direction.LEFT);
}
if((e.getKeyCode() == KeyEvent.VK_RIGHT)||(e.getKeyCode() == KeyEvent.VK_D)) {
snake.setDirection(Direction.RIGHT);
}
if(e.getKeyCode() == KeyEvent.VK_ENTER && gameOver) {
resetGame();
}
}

public static void main(String[] args) {
new PlayGame().setVisible(true);

/**JFrame frame = new JFrame("SnakeGame");
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOS E);
frame.setResizable(false);

Canvas canvas = new Canvas();
canvas.setBackground(Color.black);
canvas.setPreferredSize(new Dimension(GameBoard.MAP_SIZE * GameBoard.TILE_SIZE, GameBoard.MAP_SIZE * GameBoard.TILE_SIZE));

frame.getContentPane().add(canvas);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);

new Engine(canvas).startGame();*/


}
}



Second is PlayGame.java




package org.psnbtech;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JFrame;


public class PlayGame extends javax.swing.JDialog {


public PlayGame(java.awt.Frame parent, boolean modal) {
super(parent, modal);
initComponents();
}
public PlayGame() {
initComponents();

}

@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstan ts.DISPOSE_ON_CLOSE);

jButton1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/org/psnbtech/play.png"))); // NOI18N
jButton1.setText("Play");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});

jButton2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/org/psnbtech/GUID-4ED364DF-2D44-40F5-9F05-31D451F15EF1-low.png"))); // NOI18N
jButton2.setText("Rules");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});

jButton3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/org/psnbtech/exit.png"))); // NOI18N
jButton3.setText("Exit");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILI NG, layout.createSequentialGroup()
.addContainerGap(223, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING, false)
.addComponent(jButton3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(74, 74, 74))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(45, 45, 45)
.addComponent(jButton1)
.addGap(40, 40, 40)
.addComponent(jButton2)
.addGap(40, 40, 40)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(53, Short.MAX_VALUE))
);

pack();
}// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
JFrame frame = new JFrame("SnakeGame");
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOS E);
frame.setResizable(false);

Canvas canvas = new Canvas();
canvas.setBackground(Color.black);
canvas.setPreferredSize(new Dimension(GameBoard.MAP_SIZE *GameBoard.TILE_SIZE,GameBoard.MAP_SIZE * GameBoard.TILE_SIZE));

frame.add(canvas);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);

new Engine(canvas).startGame();

}

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
this.dispose();
new RulesDialog().setVisible(true);
}

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
}



// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
// End of variables declaration
}



Please suggest me with some solution so that it would be helpful to me in order to complete the game