如何初始化我的通用数组? [英] How can I initialize my generic array?

问题描述

我想要一个 ArrayLists 数组:

I want to have an array of ArrayLists:

ArrayList<MyClass>[] myArray;

我想用下面的代码来初始化:

I want to initialize it by the following code:

myArray = new ArrayList<MyClass>[2];

但我收到此错误:

Cannot create a generic array of ArrayList<MyClass>

如何初始化?

推荐答案

这在 Java 中严格来说是不可能的，而且自从它实施以来就没有.

This is not strictly possible in Java and hasn't been since its implementation.

你可以像这样解决它:

ArrayList<MyClass>[] lists = (ArrayList<MyClass>[])new ArrayList[2];

这可能(真的，应该)产生警告，但没有其他方法可以绕过它.老实说，您最好创建一个 ArrayList 的 ArrayList :

This may (really, it should) generate a warning, but there is no other way to get around it. In all honesty, you would be better off to create an ArrayList of ArrayLists:

ArrayList<ArrayList<MyClass>> lists = new ArrayList<ArrayList<MyClass>>(2);

我会推荐后者.

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