public int compare(birthday b1,birthday b2){
			if(b1.Month == b2.Month){
				if(b1.Day == b2.Day)
					return 0;
				else if(b1.Day < b2.Day)
					return 1;
				else
					return -1;				
			}
			if(b1.Month < b2.Month)
				return 1;
			else {
				return -1;
			}
		}