move(int direction)

void runTheGame() throws Exception {

		move(2);
		move(2);
		move(2);
		move(1);
		move(4);
		move(4);
		move(3);
	}

	void move(int direction) throws InterruptedException {
		System.out.println("ready to move...");
		if (direction == 1) {
			if ((tankY - desk_step) < 0) {
				System.out.println("there is no way to move!");
			} else {
				tankY -= desk_step;
				System.out.println("move 1 step UP");
			}
			repaint();
		}

		if (direction == 2) {
			if ((tankY + desk_step) > BF_HEIGHT) {
				System.out.println("there is no way to move!");
			} else {
				tankY += desk_step;
				System.out.println("move 1 step DOWN");
			}
			repaint();
		}
		
		if (direction == 3) {
			if ((tankX - desk_step) < 0) {
				System.out.println("there is no way to move!");
			} else {
				tankX -= desk_step;
				System.out.println("move 1 step LEFT");
			}
			repaint();
		}

		if (direction == 4) {
			if ((tankX + desk_step) > BF_WIDTH) {
				System.out.println("there is no way to move!");
			} else {
				tankX += desk_step;
				System.out.println("move 1 step RIGHT");
			}
			repaint();
		}
		Thread.sleep(tank_speed);
	}

Та же ситуация.