public ListItem reverse_i() {
    ListItem curr = this;
    ListItem prev = null;
    while (curr != null) {
      // Store the next item in the list
      ListItem next = curr.next;
      // Set the current ListItem's next value to the previous ListItem
      curr.next = prev;
      // Set the previous equal to the current value
      prev = curr;
      // Move curr along
      curr = next;
    }
    return prev;
  }