有没有办法在java中反转多维数组中的特定数组? [英] Is there a way to reverse specific arrays in a multidimensional array in java?

问题描述

我知道通常如何操作和创建多维数组，但我不知道数组具有的所有实用程序和功能.我想知道的是，如果我有一个 [5][4] 大小的二维数组，我可以将它打印在第一行按顺序，第二行倒序，第三行在订购……等等.

I know how to generally manipulate and create a multidimensional array but I don't know all the utils and features that arrays have. I want to know is if I have a 2D array the size of [5][4], can I print it where the first line is in order, second is in reverse, and the third is in order... and so on.

例如:

[1 2 3 4] //in order
[8 7 6 5] //reverse
[9 10 11 12] //in order
[16 15 14 13] //reverse
[17 18 19 20] //in order

正如我的老师所说:定义一个大小为 m × n 的二维数组.写一个方法用1到m×n的数字初始化这个数组，方法如下:第一行，从左到右初始化元素；第二行，从右到左初始化；然后切换顺序.例如，如果 m=5；并且 n = 4；数组应初始化为:"

as my teacher stated "Define a two-dimensional array of size m × n. Write a method to initialize this array with numbers from 1 to m × n in the way as below: the first row, initialize the elements from left to right; the second row, initialize from right to left; then switch order. For example, if m=5; and n = 4; the array should be initialized to:"

我不确定是否应该使用临时方法或其他一些循环方法来完成.

I’m not sure if it should be done using a temp method or some other loop method.

推荐答案

不能直接反转.但是你可以有一个循环并反转替代行:

You cannot reverse it directly. But you can have a loop and reverse the alternative rows:

void reverseArray() {
    Integer[][] arr = {
            {1, 2, 3, 4},
            {5, 6, 7, 8},
            {9, 10, 11, 12},
            {13, 14, 15, 16},
            {17, 18, 19, 20}};
    for (int i = 1; i < arr.length; i += 2) {
        Collections.reverse(Arrays.asList(arr[i]));
    }
}

这篇关于有没有办法在java中反转多维数组中的特定数组?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！