如何创建一个 ArrayLists 数组? [英] How can I create an Array of ArrayLists?

问题描述

我想创建一个如下所示的数组列表:

I am wanting to create an array of arraylist like below:

ArrayList<Individual>[] group = new ArrayList<Individual>()[4];

但它没有编译.我该怎么做?

But it's not compiling. How can I do this?

推荐答案

根据 Oracle 文档:

您不能创建参数化类型的数组"

"You cannot create arrays of parameterized types"

相反，你可以这样做:

ArrayList<ArrayList<Individual>> group = new ArrayList<ArrayList<Individual>>(4);

正如 Tom Hawting 所建议的 - 主攻线，这样做更好:

As suggested by Tom Hawting - tackline, it is even better to do:

List<List<Individual>> group = new ArrayList<List<Individual>>(4);

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