在Java语法中，Class&lt ;?延伸东西> [英] in Java syntax, Class<? extends Something>

问题描述

类< ;? extends Something>

这是我的解释，它是类模板，但类？意味着这个类的名字是不确定的，它扩展了Something类。

Here's my interpretation, it's class template but the class ? means the name of the class is undetermined and it extends the Something class.

如果我的解释有什么问题，请告诉我。

if there's something wrong with my interpretation, let me know.

推荐答案

你几乎是对的。
基本上，Java没有模板的概念（C ++有）。
这就是所谓的泛型。
这定义了泛型类 Class <> ，泛型属性是 Something 。

You are almost right. Basically, Java has no concept of templates (C++ has). This is called generics. And this defines a generic class Class<> with the generics' attribute being any subclass of Something.

我建议阅读如果你想获得模板和泛型之间的区别，那么C ++和Java中的泛型类型有什么不同？

I suggest reading up "What are the differences between "generic" types in C++ and Java?" if you want to get the difference between templates and generics.

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