小编Ahm*_*ila的帖子

我正在尝试添加两个矩阵,当编译器尝试调用sum方法时,我得到和异常.

public static void main(String[] args) {

    int[][] a = new int[3][3];
    int[][] b = new int[3][3];

    for (int i = 0; i < a.length; i++)
    {
        for (int j = 0; j < a[0].length; j++)
        {
            a[i][j] = Integer.parseInt(JOptionPane.showInputDialog("Enter a[" + i + "][" + j + "]"));
        }
    }
    for (int i = 0; i < b.length; i++)
    {
        for (int j = 0; j < b[0].length; j++)
        {
            b[i][j] = Integer.parseInt(JOptionPane.showInputDialog("Enter b[" + i + "][" + …