Java 8 stream map to list of keys sorted by values

Question

I have map Map countByType and I want to have a list which has sorted (min to max) keys by their corresponding values. My try is:

Answer 1

You can use this as an example of your problem

    Map map = new HashMap<>();
    map.put(10, "apple");
    map.put(20, "orange");
    map.put(30, "banana");
    map.put(40, "watermelon");
    map.put(50, "dragonfruit");

    // split a map into 2 List
    List resultSortedKey = new ArrayList<>();
    List resultValues = map.entrySet().stream()
            //sort a Map by key and stored in resultSortedKey
            .sorted(Map.Entry.comparingByKey().reversed())
            .peek(e -> resultSortedKey.add(e.getKey()))
            .map(x -> x.getValue())
            // filter banana and return it to resultValues
            .filter(x -> !"banana".equalsIgnoreCase(x))
            .collect(Collectors.toList());

    resultSortedKey.forEach(System.out::println);
    resultValues.forEach(System.out::println);