创建的ArrayList的数组 [英] Create an Array of Arraylists

问题描述

我想创建ArrayList的一个数组象下面这样：

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

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

但它不编译。我怎样才能做到这一点？

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

推荐答案

您不能创建泛型类型的数组，相反，你应该做的：

You cannot create an array of generic type, instead, you should do:

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

的建议由汤姆Hawting - tackline，它甚至不如做：

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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