How to sort the hashmap in descending order by values and if the values are the same then by key in-CodePudding

I have a HashMap<Integer, Integer> named "relevance" e.g {2: 3, 1: 3, 3: 3, 5: 4, 4: 4, 6: 3} and I want do DESC sorting by values.

Map<Integer, Integer> sortedRelevance = new LinkedHashMap<>();
relevance.entrySet()
        .stream()
        .sorted(Map.Entry.<Integer, Integer>comparingByValue(Comparator.reverseOrder()))
        .forEachOrdered(x -> sortedRelevance.put(x.getKey(), x.getValue()));

I get a hashmap {5: 4, 4: 4, 2: 3, 1: 3, 3: 3, 6: 3}. How can I sort ascending keys with the same values?

CodePudding user response：

You can "chain" Comparators by adding calls to thenComparing:

Map<Integer, Integer> sortedRelevance = new LinkedHashMap<>();
relevance.entrySet()
         .stream()
         .sorted(Map.Entry.<Integer, Integer> comparingByValue(Comparator.reverseOrder())
                          .thenComparing(Map.Entry.comparingByKey()))
         .forEachOrdered(x -> sortedRelevance.put(x.getKey(), x.getValue()));