算法实现

public static int k = 3;
    public static void main(String[] args) {
        int[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9};
        int[] desc = new int[arr.length];
        System.out.println("原数组内容");
        print(arr);

        for (int i = 0; i < arr.length; i++) {
            int x = i / k;
            int y = i % k;

            desc[i] = arr[x + y * k];
        }

        System.out.println();
        System.out.println("行列交换后数组内容内容");
        print(desc);
    }

    public static void print(int[] arr) {
        for (int i = 0; i < arr.length; i++) {
            if (i > 0 && i % k == 0) {
                System.out.println();
            }

            System.out.printf(arr[i] + "\t");
        }
        System.out.println();
    }

程序输出结果

原数组内容
1 2 3 
4 5 6 
7 8 9 

行列交换后数组内容内容
1 4 7 
2 5 8 
3 6 9