private void downdatePosition() {
		if (direction == 1) {
			pos_y++;
		}
		if (direction == 2) {
			pos_x++;
		}
		if (direction == 3) {
			pos_y--;
		}
		if (direction == 4) {
			pos_x--;
		}
		System.out.println(name + ": new position (down) " + pos_x + " "
				+ pos_y);
	}