double x = s.getLocation().getX() + -5 + (int) (Math.random() * 5);
double y = s.getLocation().getY() - item_spawn;
double z = s.getLocation().getZ() + 5 + (int) (Math.random() * -5);
// some code here
Location location = new Location(world, x, y, z);
world.dropItem(location, itemStack);