а есть ли функция у движка типа закрыть окно?

public class SnakeGame extends Game {
    public static  int WIDTH = 10;
    public static  int HEIGHT = 10;
    private boolean gameIsStarted = false;
    private void createGame(){
        score = 0;
        turnDelay = 300;
        setTurnTimer(turnDelay);
        snake = new Snake(WIDTH/2,HEIGHT/2);
        createNewApple();
        isGameStopped = false;
        drawScene();
        setScore(score);
    }
    @Override
    public void initialize() {
        setScreenSize(WIDTH, HEIGHT);
         for (int x=0; x< HEIGHT; x++){
            for (int y=0; y<WIDTH; y++){
                setCellValueEx (x, y, Color.DARKSEAGREEN, "");
            }
        }
        showMessageDialog(Color.BLACK, "Use RIGHT/LEFT buttons to choose the field size and press ENTER", Color.WHITE, 20);
    }
    @Override
    public void onKeyPress(Key key) {
        if (key==Key.SPACE && isGameStopped==true){
            createGame();
        }
        if (key==Key.RIGHT && gameIsStarted==true) {
            snake.setDirection(Direction.RIGHT);
        }
        else if (key==Key.LEFT && gameIsStarted==true) {
            snake.setDirection(Direction.LEFT);
        }
        else if (key==Key.UP && gameIsStarted==true) {
            snake.setDirection(Direction.UP);
        }
        else if (key==Key.DOWN && gameIsStarted==true) {
            snake.setDirection(Direction.DOWN);
        }
        if (key==Key.RIGHT && gameIsStarted==false) {
            WIDTH +=5; HEIGHT+=5;
            initialize();
        }
        if (key==Key.LEFT && gameIsStarted==false) {
            WIDTH -=5; HEIGHT-=5;
           initialize();
        }
        if (key==Key.ENTER ){
            createGame();
            gameIsStarted=true;
        }
    }
}