docs: public static <K extends Comparable< ? super K>,V extends Comparable< ? super V>> List<Entry<K,V>>
              sortKeyValuePairByValue(Map<K,V> map) {
          List<Map.Entry<K,V>> entries = new ArrayList<Map.Entry<K,V>>(map.entrySet());
          Collections.sort(entries, new Comparator<Map.Entry<K,V>>() {
              @Override
              public int compare(Entry<K,V> o1, Entry<K,V> o2) {
                  if (!o1.getValue().equals(o2.getValue())) {
                      return (o1.getValue()).compareTo(o2.getValue());
                  }
                  return o1.getKey().compareTo(o2.getKey());
              }
          } );
          return entries;
      }