#Java收集的HashMap

Question

我想在按價值計算，僅打印具有最高值 注意關鍵降序排序地圖：如果您想根據輔助排序打印多個關鍵如果兩者都具有相同的價值

map.put(5,3); 
    map.put(4,1); 
    map.put(2,2); 
    map.put(10,3); 



    Set <Map.Entry<Integer,Integer>>set = map.entrySet(); 
     List <Map.Entry<Integer,Integer>> list = new ArrayList<Map.Entry<Integer,Integer>>(set); 

     Collections.sort(list, new Comparator<Map.Entry<Integer,Integer>>(){ 
      public int compare(Map.Entry<Integer,Integer> obj1, Map.Entry<Integer,Integer> obj2){ 
       return (obj2.getValue().compareTo(obj1.getValue())); 
      } 

     }); 

Now i got output 5,10 but i want output as 10,5 

Answer 1

鍵（即，如果值相等，按降序排列鍵），爲等於大小寫的情況添加條件：

Collections.sort(list, new Comparator<Map.Entry<Integer,Integer>>(){ 
     public int compare(Map.Entry<Integer,Integer> obj1, Map.Entry<Integer,Integer> obj2){ 
      if (!obj2.getValue().equals(obj1.getValue())) 
       return (obj2.getValue().compareTo(obj1.getValue())); 
      else 
       return (obj2.getKey().compareTo(obj1.getKey())); 
     } 

    });