public DLList reverse() {
    Node temp = null;
    Node current = head;

        while (current != null) {
          temp = current.getPrevious();
          current.setPrevious(current.getNext());
          current.setNext(temp);
          current = current.getPrevious();
        }

        if (temp != null) {
            head = temp.getPrevious();
        }
      return
    }