Java Arrays.sort在二维数组中排序的应用

import java.util.*;


public class Main {
    public static void main(String[] args) {
//        Solution su = new Solution();
//        System.out.println(su.intToRoman(111));
        erweishuzupaixu(new int[][]{{1, 2, 3, 4}, {1, 1, 5, 6}, {2, 3, 4, 5}, {3, 2, 4, 1}});
    }

    函数测试
    private static void erweishuzupaixu(int[][] arr) {

        Arrays.sort(arr, new Comparator() {
            @Override
            public int compare(int[] o1, int[] o2) {
                if (o1[0] != o2[0]) {
                    return o1[0] - o2[0];
                } else {
                    if (o1[1] != o2[1]) {
                        return o1[1] - o2[1];
                    } else {
                        return o1[2] - o2[2];
                    }
                }
            }
        });
        //输出结果
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr[0].length; j++) {
                System.out.print(arr[i][j] + " ");
            }
            System.out.println();
        }
    }
}