как сделать так, чтобы метод не изменял направление змейки?
package com.javarush.games.snake;
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 int turnDelay;
@Override
public void initialize(){
setScreenSize(WIDTH, HEIGHT);
createGame();
}
private void createGame(){
turnDelay = 300;
snake = new Snake(WIDTH / 2, HEIGHT / 2);
drawScene();
setTurnTimer(turnDelay);
}
private void drawScene(){
for(int x = 0; x < getScreenWidth(); x++){
for(int y = 0; y < getScreenHeight(); y++){
setCellValueEx(x, y, Color.DARKSEAGREEN, "") ;
}
}
snake.draw(this);
}
@Override
public void onTurn(int step){
snake.move();
drawScene();
}
@Override
public void onKeyPress(Key key){
switch (key) {
case UP : {
snake.setDirection(Direction.UP);
break;
}
case DOWN : {
snake.setDirection(Direction.DOWN);
break;
}
case LEFT : {
snake.setDirection(Direction.LEFT);
break;
}
case RIGHT : {
snake.setDirection(Direction.RIGHT);
break;
}
}
}
}