private static <K, V extends Comparable<V>> TreeMap<K, V> sortByValues(Map<K, V> map) {
        Comparator<K> valueComparator = new Comparator<K>() {
            public int compare(K k1, K k2) {
                int compare = map.get(k1).compareTo(map.get(k2));
                return -compare;
            }
        };

        TreeMap<K, V> sortedByValues = new TreeMap<>(valueComparator);
        sortedByValues.putAll(map);
        return sortedByValues;
    }