⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒⇒ Warning! We have a problem with a Snakegame. Who can help ?

Добрый вечер Игра не работает : белый экран Глаз мозолит уже , может быть вы подскажите где ошибку допустил я?

//класс Snake
package com.javarush.games.snake;
import com.javarush.engine.cell.*;


import java.util.ArrayList;
import java.util.List;
import java.util.*;

public class Snake extends GameObject {
    public Snake(int x, int y) {
        super(x,y);
        GameObject firstPart = new GameObject(x, y);
        GameObject secondPart = new GameObject(x + 1, y);
        GameObject thirdPart = new GameObject(x + 2, y);
        snakeParts.add(firstPart);
        snakeParts.add(secondPart);
        snakeParts.add(thirdPart);
    }

    public void move(Apple apple) {
        GameObject newHead = createNewHead();
        if (newHead.x >= SnakeGame.WIDTH
                || newHead.x < 0
                || newHead.y >= SnakeGame.HEIGHT
                || newHead.y < 0) {
            isAlive = false;
            return;
        }

        if (checkCollision(newHead)) {
            isAlive = false;
            return;
        } else snakeParts.add(0, newHead);

        if (newHead.x == apple.x && newHead.y == apple.y) {
            apple.isAlive = false;
        } else {
            removeTail();
        }

    }
    public int getLength(){return snakeParts.size();}

    public boolean checkCollision(GameObject object) { //проверка на столкновение с телом змеи
        boolean answer = false;
        for (GameObject obj : snakeParts) {
            if (object.x == obj.x && object.y == obj.y) {
                answer = true;
                break;
            }
        }
        return answer;
    }



        public void setDirection(Direction direction) {
            switch (this.direction) {
                case LEFT:
                case RIGHT:
                    if (snakeParts.get(0).x == snakeParts.get(1).x) return;
                    break;
                case UP:
                case DOWN:
                    if (snakeParts.get(0).y == snakeParts.get(1).y) return;
                    break;
            }
            this.direction = direction;
        }



        public void removeTail() {
            snakeParts.remove(snakeParts.size() - 1);
        }

        public GameObject createNewHead() {
           GameObject gameObject = null;
            if(direction == Direction.UP)
                gameObject =new GameObject(snakeParts.get(0).x, snakeParts.get(0).y - 1);
            if(direction == Direction.DOWN)
                gameObject = new GameObject(snakeParts.get(0).x, snakeParts.get(0).y + 1);
            if(direction == Direction.RIGHT)
                gameObject = new GameObject(snakeParts.get(0).x+1, snakeParts.get(0).y);
            if(direction == Direction.LEFT)
                gameObject = new GameObject(snakeParts.get(0).x-1, snakeParts.get(0).y );
            return gameObject;




    private Direction direction = Direction.LEFT;
    private List<GameObject> snakeParts = new ArrayList<>();
    private static final String HEAD_SIGN = "\uD83D\uDC7E";
    private static final String BODY_SIGN = "\u26AB";
    public boolean isAlive = true;


    public void draw(Game snake){
        for (int i = 0; i < snakeParts.size(); i++) {
            if (i == 0)
                snake.setCellValueEx(
                        snakeParts.get(i).x,
                        snakeParts.get(i).y,
                        Color.NONE,
                        HEAD_SIGN,
                        isAlive? Color.BLACK : Color.RED,
                        75);
            else
                snake.setCellValueEx(
                        snakeParts.get(i).x,
                        snakeParts.get(i).y,
                        Color.NONE,
                        BODY_SIGN,
                        isAlive? null : Color.RED,
                        75);
        }
      }
    }











//класс SnakeGame

package com.javarush.games.snake;

import com.javarush.engine.cell.Game;
import com.javarush.engine.cell.*;


public class SnakeGame extends Game {
        public static final int WIDTH = 15;
        public static final int HEIGHT = 15;
        private Snake snake;
        private Apple apple;
        public void initialize() {
           setScreenSize (WIDTH, HEIGHT);
           createGame();
    }

    private int score;
    private boolean isGameStopped;
    private static final int GOAL = 28;
    private void win(){
        stopTurnTimer();
        isGameStopped = true;
        showMessageDialog(Color.ALICEBLUE,"YOU ARE WIN!CONGRATULATIONS!",Color.BISQUE,35);

    }


    @Override
    public void onKeyPress(Key key) {

        if(key == Key.LEFT){
            snake.setDirection(Direction.LEFT);}
        else if(key == Key.RIGHT){
            snake.setDirection(Direction.RIGHT);}
        else if(key == Key.UP){
            snake.setDirection(Direction.UP);}
        else if(key == Key.DOWN){
            snake.setDirection(Direction.DOWN);}
        if(key == Key.SPACE && isGameStopped ){
            createGame();
        }
        }


    private void gameOver(){
        stopTurnTimer();
        isGameStopped = true;
        showMessageDialog(Color.DARKTURQUOISE,"YOU ARE DEAD!",Color.AQUAMARINE,29);
    };

    @Override
    public void onTurn(int step) {

        if(!snake.isAlive)
            gameOver();

        snake.move(apple);
        if(!apple.isAlive){
            score+=5;
            setScore(score);
            createNewApple();
            turnDelay-=10;
            setTurnTimer(turnDelay);
        }
        if(snake.getLength()>GOAL) {
            win();
        }
           drawScene();
        //onTurn(int) должен быть вызван метод drawScene() после вызова snake.move().

    }

        private void createNewApple() {
            do {
                apple = new Apple(getRandomNumber(WIDTH), getRandomNumber(HEIGHT));
            } while (snake.checkCollision(apple));
        }


        private int turnDelay;

    private void createGame(){
             score =0;
            setScore(score);
            Snake snake = new Snake(WIDTH/2,HEIGHT/2);
            createNewApple();
            isGameStopped = false;
                    drawScene();

            turnDelay =300;
            setTurnTimer(turnDelay);




    }
    private void drawScene(){
            {
                for(int x = 0; x < WIDTH; x++){
                    for(int y =0; y < HEIGHT; y++){
                        setCellValueEx(x,y,Color.BLACK,""); } } }

        snake.draw(this);
          apple.draw(this);
        }


}