code: public Object searchGreater(
                                 Object            searchKey)
      {
          SearchComparator comp = searchComparator(SearchComparator.GT);
          Object p = find(comp, searchKey);
          return p;
      }
docs: Find the first key in the index that is greater than the given key.
  
  @param searchKey The key to be found.
  
  @return The first key in the index that is strictly greater than
  the supplied key (searchKey).