public void move(int distance, Direction direction, boolean useFuel) {
switch (direction) {
case UP:
location.y -= distance;
break;
case DOWN:
location.y += distance;
break;
case LEFT:
location.x -= distance;
break;
case RIGHT:
location.x += distance;
break;
default:
assert false : "Bad direction: " + location;
}
if (useFuel) tank.useFuel(1);
}
public void goToLocation() {
location.x = storedLocation.x;
location.y = storedLocation.y;
}