Question

所以我的任务是编写一个可以创建两个矩阵的程序，然后将它们加在一起。我必须询问矩阵1的长度和高度，然后询问矩阵2的长度和高度。我在这里做了：

    Scanner keyboard = new Scanner(System.in);
    int length1, height1, length2, height2; 
    System.out.println("Welcome to the matrix adder program");
    System.out.println(" ");
    System.out.println("Please enter the length of the first matrix");     
    length1 = keyboard.nextInt();
    System.out.println("Please enter the height of the first matrix");
    height1 = keyboard.nextInt();

    System.out.println("Please enter the length of the second matrix");
    length2 = keyboard.nextInt();
    System.out.println("Please enter the height of the second matrix");
    height2 = keyboard.nextInt();
    int[][] a = new int[length1][height2];
    int[][] b = new int[length2][height2];

然后我需要输入矩阵1第1行，第1列，第1行，第2列等的值，直到它满足数组的尺寸。所以我把

for (int i = 1; i < length1 + 1; ++i) 
    {
        for (int j = 1; j < height1 + 1; ++j) 
        {
            System.out.println("Please enter a value for matrix 1 space "+ i + "," + j);
            a[i][j] = keyboard.nextInt();
        }
    }

这就是我在线程＆＃34; main＆＃34;中得到错误异常的地方。 java.lang.ArrayIndexOutOfBoundsException：2 在MaxtrixAddition.main（MaxtrixAddition.java:32）

需要输出如下内容：

Please enter a value for matrix 1 space 1, 1
4
Please enter a value for matrix 1 space 1, 2
1
Please enter a value for matrix 1 space 2, 1
8
Please enter a value for matrix 1 space 2, 2
7

Please enter a value for matrix 2 space 1, 1
1
Please enter a value for matrix 2 space 1, 2
3
Please enter a value for matrix 2 space 2, 1
2
Please enter a value for matrix 2 space 2, 2
4

我需要做些什么才能摆脱这个错误？

Answer 1

我希望我明白你想做什么。

阵列从位置0开始。

所以你的代码片段应该是：

for (int i = 0; i < length1; ++i) 
{
    for (int j = 0; j < height1 ; ++j) 
    {
        System.out.println("Please enter a value for matrix 1 space "+ i + "," + j);
        a[i][j] = keyboard.nextInt();
    }
}

在java中添加2个矩阵

1 个答案: