二维数组第一次使用

 1 package com.wh.array;
 2 
 3 import java.util.Arrays;
 4 import java.util.Scanner;
 5 
 6 public class Demo {
 7 
 8     public static void main(String[] args) {
 9         Scanner sc=new Scanner(System.in);
10         int m,n;
11         System.out.println("m");
12         m=sc.nextInt();
13         System.out.println("n");
14         n=sc.nextInt();
15         int[][] arr=new int[m][n];
16         for (int i = 0; i < m; i++) {
17             for (int j = 0; j <n; j++) {
18                  arr[i][j]=(int)(Math.random()*100);
19             }
20         }
21         for(int i=0;i<m;i++){
22            System.out.println(Arrays.toString(arr[i]));   
23         }
24     }
25 }

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]