In my game there are ships moving from left to right while randomly spawning, now i want the ships to drop oil on a random X number. the code that i made for that is private int getRandomNumber(int start, int end) { int normal = Greenfoot.getRandomNumber(end-start+1); return normal+start; } int randomX = getRandomNumber(50,750); if(getWorld() != null && getX() == randomX) { getWorld().addObject(new Oil(), getX(), getY()); } Everything works fine but not every boat drops an oil. any help would be appreciated