java 输出5行5列的二维数组并求出二维数组的平均数

package com.hidata.devops.paas.demo;
import java.util.Random;
/**
 * 任务2、求二维数组的平均数
 */
public class ArrayAvgTest {
    public static void main(String[] args) {
        int [] [] arr = new int [5][5];
        int total = 0;
        Random random = new Random();
        for (int i = 0; i < arr.length; i++) {
            System.out.println();
            for (int j = 0; j < arr.length; j++) {
                int num = random.nextInt(20-10+1)+10;
                arr[i][j] = num;
                System.out.print(arr[i][j] + "\t");
                total = total+arr[i][j];
            }
        }
        int avg = total/(arr.length*arr[0].length);
        System.out.println("");
        System.out.println("整个二维数组的平均值为：" + avg );
    }
}

19  20  15  14  15  
12  14  12  11  11  
10  12  20  14  17  
18  12  16  11  10  
19  12  10  11  12  
整个二维数组的平均值为：13
Process finished with exit code 0