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  1. import java.util.*;
  2.  
  3. class Main {
  4.   public static void main(String[] args) {
  5.     final Map<String, Integer> map = new HashMap<>();
  6.     map.put("first", 50);
  7.     map.put("second", 10);
  8.     map.put("third", 50);
  9.  
  10.     List<String> keys = map.entrySet().stream()
  11.       .collect(() -> new Object() {
  12.            int max = Integer.MIN_VALUE;
  13.            List<String> keys = new ArrayList<>();
  14.         }, (current, next) -> {
  15.           int value = next.getValue();
  16.           if(value >= current.max) {
  17.             if(value > current.max) {
  18.               current.max = value;
  19.               current.keys.clear();
  20.             }
  21.             current.keys.add(next.getKey());
  22.           } 
  23.         }, (a, b) -> {
  24.           if(a.max <= b.max) {
  25.             a.max = b.max;
  26.             a.keys = b.keys;
  27.           }
  28.           else if(a.max == b.max) a.keys.addAll(b.keys);
  29.         }).keys;
  30.  
  31.  
  32.     System.out.println(keys);
  33.   }
  34. }
Success #stdin #stdout 0.09s 50556KB
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[third, first]
https://ideone.com/W5ESkU
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
secret

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