java两个数组相乘怎么运算的

int[][] A = {
    {1, 2},
    {3, 4}
};

int[][] B = {
    {5, 6},
    {7, 8}
};

int[][] C = {
    {19, 22},
    {43, 50}
};

public class ArrayMultiplication {

    public static void main(String[] args) {
        int[][] A = {
            {1, 2},
            {3, 4}
        };

        int[][] B = {
            {5, 6},
            {7, 8}
        };

        int[][] C = multiply(A, B);

        for (int i = 0; i < C.length; i++) {
            for (int j = 0; j < C[0].length; j++) {
                System.out.print(C[i][j] + " ");
            }
            System.out.println();
        }
    }

    public static int[][] multiply(int[][] A, int[][] B) {
        int m = A.length; // A 的行数
        int n = B.length; // B 的列数
        int q = B[0].length; // B 的行数（也等于 C 的列数）

        int[][] C = new int[m][q];

        for (int i = 0; i < m; i++) {
            for (int j = 0; j < q; j++) {
                for (int k = 0; k < n; k++) {
                    C[i][j] += A[i][k] * B[k][j];
                }
            }
        }

        return C;
    }
}

19 22
43 50