public void update()
	{
		for (int i = 0; i < population.size(); ++i)
		{
			population.get(i).update();
		}
		
		for (int i = 0; i < buildings.length; ++i)
		{
			for (int j = 0; j < buildings[i].length; ++j)
			{
				if (buildings[i][j] != null)
				{
					buildings[i][j].update();
				}
			}
		}
	}