set 排序实例

Posted 2020-12-18 hzcjd

 public static void main( String[] args ) {
        Set<String> set = new HashSet<>();
        set.add("20180102");
        set.add("20180101");
        set.add("20180103");
        set.add("20180104");
        set.add("20180105");
        set.add("20180102");
        set.stream().sorted(Comparator.reverseOrder());
        System.out.println(set.toString());
        List<String> list=new ArrayList<>(set);
        String newKey=list.get(list.size()-1);
        System.out.println(newKey);

    }