二维数组第一次使用

package com.wh.array;

import java.util.Arrays;
import java.util.Scanner;

public class Demo {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int m,n;
        System.out.println("m");
        m=sc.nextInt();
        System.out.println("n");
        n=sc.nextInt();
        int[][] arr=new int[m][n];
        for (int i = 0; i < m; i++) {
            for (int j = 0; j <n; j++) {
                 arr[i][j]=(int)(Math.random()*100);
            }
        }
        for(int i=0;i<m;i++){
           System.out.println(Arrays.toString(arr[i]));   
        }
    }
}

运行结果
m
3
n
7
[82, 32, 78, 36, 96, 32, 65]
[24, 42, 6, 81, 99, 0, 31]
[70, 56, 37, 5, 86, 94, 25]