Question

用java程序建立一个3*3的二维数组

用java程序建立一个3*3的二维数组，数组的值用随机数产生，其范围在1-100之间，然后计算每行的总和和平均值。

Answer 1

import java.util.Random;

public class demo {

public static void main(String[] args) {

int[][] Array = new int[3][3];

Random random = new Random();

for (int i = 0; i < Array.length; i++) {

            int sum=0;

for (int n = 0; n < Array[i].length; n++) {

Array[i][n] = random.nextInt(99) + 1;

sum+=Array[i][n];

}

System.out.println("第"+(i+1)+"行的和"+sum);

System.out.println("第"+(i+1)+"行的平均数"+(sum/3));

}

}

}

Answer 2

public static void main(String[] args)
{
int[][] arr = new int[3][3];

for(int i = 0;i < 3;i++){
int sum = 0,avg = 0;
for(int j = 0;j < 3;j++){
arr[i][j] = (int)(Math.random()*100);
sum+=arr[i][j];
System.out.println("arr["+i+"]["+j+"]:"+arr[i][j]);
}
avg = sum / 3;
System.out.println();
System.out.println("row:"+i+" sum:"+sum+" avg:"+avg);
}
}