code: public <K extends Comparable<K>, V> SortedMap<K, V> getSortedMap()
      {
          return new TreeMap<K, V>();
      }
docs: Create and return a new {@link SortedMap}, which ensures that iterating the map will always return the entries in
  the natural order of the keys.
  
  @param <K> the type of keys maintained by this map
  @param <V> the type of mapped values
  @return a new, empty {@link TreeMap}