code: public static <T> SortedSet<T> asSynchronized(SortedSet<T> self) {
          return Collections.synchronizedSortedSet(self);
      }
docs: A convenience method for creating a synchronized SortedSet.
  
  @param self a SortedSet
  @return a synchronized SortedSet
  @see java.util.Collections#synchronizedSortedSet(java.util.SortedSet)
  @since 1.0