public void addApple() {
accomplishedSnake = false;
accomplishedApples = false;
while(!accomplishedSnake || !accomplishedApples) {
    xApple = 20 * MathUtils.random(0, 23);
    yApple = 20 * MathUtils.random(20, 36);
    accomplishedSnake = false;
    accomplishedApples = false;
    if(!accomplishedSnake) {
for(int i=0; i<snake.getSize(); i++) {
    if (snake.getPart(i).getX() >= xApple
      && snake.getPart(i).getX() + 20 <= xApple
      && snake.getPart(i).getX() >= xApple+20
      && snake.getPart(i).getX() + 20 <= xApple+20
      && snake.getPart(i).getY() >= yApple
      && snake.getPart(i).getY() + 20 <= yApple
      && snake.getPart(i).getY() >= yApple +20
      && snake.getPart(i).getY() + 20 <= yApple +20) {
break;
    }
    if(i == snake.getSize()-1)
accomplishedSnake = true;
}
    }
    if(!accomplishedApples) {
for(int i=0; i<apples.size; i++) {
    if(apples.get(i).getX() == xApple && yApple == apples.get(i).getY()) {
accomplishedApples = false;
accomplishedSnake = false;
break;
    }
    if(i == apples.size-1)
accomplishedApples = true;
}
    }
}
apples.add(new Apple(xApple, yApple));
    }