@Override
        public int compare(Tourist one, Tourist two) {
            int first = one.getLastName().compareTo(two.getLastName());
            if (first == 0) {
                int second = one.getFirstName().compareTo(two.getFirstName());
                if (second == 0) {
                    return one.getMiddleName().compareTo(two.getMiddleName());
                } else {
                    return second;
                }
            } else {
                return first;
            }
        }