如何使 ArrayList 在 java 中作为二维数组工作? [英] How to make ArrayList that work as two dimentional array in java?

问题描述

我想在 java 中创建 arrayList 对象作为二维数组.我的问题是我们如何从 arrayList 的特定维度访问值.

在二维数组中，如果我想访问值，那么它可以是 m[i][j].

但是在 arraylist 中我该怎么做?

解决方案

你的意思是类似于 List 中的 List??

可能有点像……

List>twoDList = new ArrayList<>();

<块引用>

我想制作一个列表，其中每个列表键都包含另一个列表

它应该更像是您想要某种Map，它基本上是一个键/值对.

Map>mapValues = new HashMap<>(25);列表<字符串>listOfValues = ...;//...mapValues.put("此列表的唯一键", listOfValues);//...列表<字符串>thatListOfValues = mapValues.get("此列表的唯一键");

I want to make arrayList object in java that work as two dimentional array. My question is how can we access value from specific dimention from arrayList.

in two dimentional array, if i want to access value then it can be as m[i][j].

But in arraylist how can i do that ?

解决方案

You mean something like a List in a List??

May be something like...

List<List<...>> twoDList = new ArrayList<>();

i want to make a List, in which each List key contains another List inside it

It should more like you want some kind of Map, which is basically a key/value pair.

Map<String, List<String>> mapValues = new HashMap<>(25);
List<String> listOfValues = ...;
//...
mapValues.put("A unique key for this list", listOfValues);

//...

List<String> thatListOfValues = mapValues.get("A unique key for this list");

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