第6章_数组_编程练习_Exercise6_25(二维数组的相乘)

/**
*两个二维数组的想相乘；
*这个两个二维数组要求行数，类型相等
*/

public class Exercise6_25 {

static int[][] arr ;

public static void main(String[] args){
int[][] a = {
{1,2,3},
{4,5,6},
{7,8,9}
};
int[][] b = {
{11,12,13},
{24,25,26},
{37,38,39}
};

System.out.println("数组相乘的结果：");
int[][] result = getArray(a, b);
for(int i = 0; i < result.length; i++){
for(int j = 0; j< result[i].length; j++){
System.out.print( result[i][j] + " ");
}
System.out.println();
}
}

public static int[][] getArray(int[][] a, int[][] b){
//一定要给arr分配空间，不然就会出现空指针异常
arr = new int[a.length][a[1].length];
for(int i = 0; i < a.length; i++){
for(int j = 0; j < a[i].length; j++){
arr[i][j] = a[i][j] * b[i][j];
}
}
return arr;
}
}