moveRandom

public class BattleFieldTemplate extends JPanel {
	boolean COLORDED_MODE = true;
	int desk_step = 64;
	int tank_move_step = 7;
	long tank_speed = 500;
	int tankX = 0;
	int tankY = 0;

	void runTheGame() throws Exception {
		moveRandom();
	}

	void moveRandom() throws InterruptedException {
		while (true) {
			int i = getRandom();
			System.out.println(i);
			move(i);
			repaint();
			Thread.sleep(tank_speed);
		}
	}

	int getRandom() {
		String str = String.valueOf(System.currentTimeMillis());

		int y = 0;
		for (int i = 0; i < str.length() - 1; i++) {
			if ((i % 2) == 0) {
				y += Integer.parseInt(str.valueOf(str.charAt(i)));
				System.out.print(i + " ");
			} else {
				y -= Integer.parseInt(str.valueOf(str.charAt(i)));
				System.out.print(i + " ");
			}
		}
		y = (Math.abs(y)%4+1);
		System.out.println("y: " + y);
		return y;
	}

Вы игнорируете мои указания. Плохо для Вас.