java - java中如何将两个多维数组相加？

Question

public class MatrixAddition {

    public static void main(String[] args) {

        int ar1[][] = { { 0, 1, 2 }, { 3, 4, 5 }, { 6, 7, 8 } };
        int ar2[][] = { { 8, 7, 6 }, { 5, 4, 3 }, { 2, 1, 0 } };

        addArray(ar1, ar2);

    }

    private static void addArray(int[][] tmp1, int[][] tmp2) {
        int[][] sum = {};
        System.out.println(" ");
        System.out.println("The sum of the two matrices is");
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                sum[i][j] = tmp1[i][j] + tmp2[i][j];
                System.out.print(sum[i][j] + "  ");
            }

        }

    }

}

输出:

The sum of the two matrices is
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0

Answer 1

您唯一的问题是您没有正确初始化 sum 数组:

int[][] sum = new int[tmp1.length][tmp1[0].length];

将其初始化为空数组。