博客

public static void main(String[] args) throws FileNotFoundException {
        Map map = new HashMap<>();
        map.put("张三", 100);
        map.put("李四", 120);
        map.put("王帅", 90);
        map.put("赵小明", 70);
        map.put("华仔", 100);
        //Map转为Set
        Set<Map.Entry<String,Integer>> entrySet = map.entrySet();
        //创建List ，把Set放进去
        List<Map.Entry<String,Integer>> list = new ArrayList(entrySet);
        //排序
        Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() {
            @Override
            public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
                //从大到校  加个”-“
                return  -(o1.getValue()-o2.getValue());
            }
        });
        for (Map.Entry<String, Integer> temp : list){
            System.out.println(temp);
        }
    }