java中对List对象集合进行排序

//companys 是一个List对象集合
Collections.sort(companys, new Comparator() {
			public int compare(Object a, Object b) {
				Long one = ((UserCompany) a).getCompany().getComid();
				Long two = ((UserCompany) b).getCompany().getComid();
				return (int) (one - two);
			}
		});