Sort List of Tuples in Java

import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        ArrayList<Tuple> arr = new ArrayList<>();

        arr.add(new Tuple(1, 2, 3));
        arr.add(new Tuple(1, 2, 100));
        arr.add(new Tuple(1, 2, 1));

        Collections.sort(arr);

        for (Tuple tp : arr) {
            System.out.println(tp.first + " " + tp.second + " " + tp.third);
        }
    }

    static class Tuple implements Comparable<Tuple> {
        int first;
        int second;
        int third;

        Tuple(int first, int second, int third) {
            this.first = first;
            this.second = second;
            this.third = third;
        }

        @Override
        public int compareTo(Tuple other) {
            if (this.first < other.first) {
                return -1;
            }
            if (this.second < other.second) {
                return -1;
            }
            if (this.third < other.third) {
                return -1;
            }
            return 1;
        }
    }
}