Kotlin中可调整大小的二维数组 [英] Resizeable two-dimensional array in Kotlin

问题描述

我想知道如何在Kotlin中制作可调整大小的二维数组.

C ++示例:vector< vector<int> > my_vector

我尝试过的操作:var seqList: List<List<Int>> = ArrayList<ArrayList<Int>>()

但是使用seqList.add()时出现错误

but I'm getting an error when using seqList.add()

错误:未解决的参考:添加

error: unresolved reference: add

我已经在stackoverflow上阅读了有关Kotlin中2d数组的一些问题，但它们与不可调整大小的数组有关或已过时

I have read some questions regarding 2d arrays in Kotlin at stackoverflow, but they are about not-resizeable arrays or are outdated

推荐答案

科特琳有单独的 MutableList 接口，例如，如此处所述. ArrayList是MutableList，您只需将其另存为MutableList变量，即可访问对其进行突变的方法:

Kotlin has separate List and MutableList interfaces, as explained here, for example. ArrayList is a MutableList, you just have to save it as a MutableList variable in order to be able to access methods that mutate it:

val seqList: MutableList<MutableList<Int>> = ArrayList() // alternatively: = mutableListOf()

seqList.add(mutableListOf<Int>(1, 2, 3))

还要注意 mutableListOf 和 arrayListOf 方法在标准库中，它很容易创建列表，而不是直接使用ArrayList的构造函数.

Also note the mutableListOf and arrayListOf methods in the standard library, which are handy for creating lists instead of directly using the constructor of, say, ArrayList.

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