code: public boolean contains(T element) {
      if (element == null) { return false; }
      return comparator.compare(element, min) > -1 && comparator.compare(element, max) < 1;
    }
docs: <p>
  Checks whether the specified element occurs within this range.
  </p>
  
  @param element the element to check for, null returns false
  @return true if the specified element occurs within this range