整数GT; []×约的ArrayList＆LT的Java问题 [英] Java question about ArrayList<Integer>[] x

问题描述

我一直用的ArrayList数组这一个问题。也许你可以提供帮助。

I have always had this one issue with arrays of ArrayLists. Maybe you can help.

//declare in class
private ArrayList<Integer>[] x;

//in constructor
x=new ArrayList[n];

这生成有关选中转换警告。

This generates a warning about unchecked conversion.

但

x=new ArrayList<Integer>[n];

是一个编译器错误。

is a compiler error.

任何想法？

谢谢！

推荐答案

您不能让泛型列表的数组。幸运的是，有解决方法。而更幸运的是，有关于<一个一个不错的网站href=\"http://www.angelikalanger.com/Articles/Papers/JavaGenerics/ArraysInJavaGenerics.htm\">Generics更多信息比你曾经想要知道的。链接去直接在Java泛型一部分阵列。

You can't make a array of generics lists. Fortunately, there are workarounds. And even more fortunately, there is a nice site about Generics with more information than you'd ever want to know. The link goes straight to the Arrays in Java Generics part.

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