List 排序

public static void main(String[] args) {

        List<Integer> date = new ArrayList<Integer>();
        date.add(9);
        date.add(2);
        date.add(1);
        date.add(6);
        date.add(5);
        Collections.sort(date, new Comparator<Integer>() {
            @Override
            public int compare(Integer o1, Integer o2) {
                return o1.compareTo(o2);
            }
        });
        System.out.println(date.get(0) + " " + date.toString());
    }

运行结果：
1 [1, 2, 5, 6, 9]