code: public static <K, V> TreeMap<K, V> newTreeMap(SortedMap<K, ? extends V> map) {
      return new TreeMap<>(map);
    }
docs: Creates a <i>mutable</i> {@code TreeMap} instance with the same mappings as the specified map
  and using the same ordering as the specified map.
  
  <p><b>Note:</b> if mutability is not required, use {@link
  ImmutableSortedMap#copyOfSorted(SortedMap)} instead.
  
  <p><b>Note for Java 7 and later:</b> this method is now unnecessary and should be treated as
  deprecated. Instead, use the {@code TreeMap} constructor directly, taking advantage of the new
  <a href="http://goo.gl/iz2Wi">"diamond" syntax</a>.
  
  @param map the sorted map whose mappings are to be placed in the new map and whose comparator
  is to be used to sort the new map
  @return a new {@code TreeMap} initialized with the mappings from {@code map} and using the
  comparator of {@code map}