检查Java中列表类的类型 [英] Check what type a list class is of in java

问题描述

鉴于我拥有

Class<?> clazz

我要验证 clazz 是否我特定对象的列表

I want to verify if clazz is a list of my specific object

所以我从

if (List.class.isAssignableFrom(type)) {

}

但是直到这里，我只验证它是 List<？> 。例如，如何验证它是 List< String> ？

but up till here I only verified that it is List<?>. How can I verify for example it is a List<String>?

推荐答案

你不能。由于泛型的性质，在运行时会删除类型信息。如果您有一个空的列表，您将无法确定。如果为非空，则可以检查第一个元素，看看它是否为 String 。当然，这不会告诉您它是 List< String> ， List< CharSequence> 还是原始列表。

You can't. Due to the nature of generics, at runtime the type information is erased. If you have an empty List, you can't tell anything for sure. If it's non-empty, you can check the first element and see if it's a String. That of course won't tell whether it's a List<String>, List<CharSequence> or a raw list.

如果您知道这些信息，您打算如何处理？肯定会有更好的方法。

What do you intend to do with the information if you get it? There's bound to be a better approach.

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