java.lang.class 和Cls有什么区别？(What is the difference between java.lang.class and just Cls? [duplicate])

java.lang.class 和Cls有什么区别？(What is the difference between java.lang.class and just Cls? [duplicate])

这个问题在这里已有答案：

什么是Class对象（java.lang.Class）？ 5个答案

java.lang.class<Cls>和Cls什么区别？

我需要将它传递给一个函数：

java.lang.Class<org.xbib.elasticsearch.action.termlist.TermlistRequest>

我尝试了new TermlistRequest()但它是这样的：

org.xbib.elasticsearch.action.termlist.TermlistRequest

你能解释一下Java中的内容吗？ 以及如何创建这种类型的对象？

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java.lang.class - 我错过的是我需要将.class附加到Cls以获取类型java.lang.class<Cls>

This question already has an answer here:

what is the Class object (java.lang.Class)? 7 answers

What is the difference between java.lang.class<Cls> and just Cls?

I need to pass this to a function:

java.lang.Class<org.xbib.elasticsearch.action.termlist.TermlistRequest>

I tried new TermlistRequest() but it is this:

org.xbib.elasticsearch.action.termlist.TermlistRequest

Can you explain what is it in Java? And how to create an object of this type?

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java.lang.class - what I missed was I needed to append .class to Cls to get the type java.lang.class<Cls>

最满意答案

Class<T>和T之间的区别在于Class<T> Class<T>表示关于T元数据。 您可以查找T的方法和字段，还可以通过调用newInstance方法创建新实例。

就创建Class<T>对象而言，最简单的方法是使用MyClass.class语法，例如

Class<TermlistRequest> tr = TermlistRequest.class;

也可以通过动态解析类来获取Class （但不是Class<T> ）对象。

The difference between Class<T> and T is that Class<T> represents metadata about T. You can look up T's methods and fields, and also create new instances by calling newInstance method.

As far as creating Class<T> objects goes, the simplest approach is to use MyClass.class syntax, e.g.

Class<TermlistRequest> tr = TermlistRequest.class;

Class (but not Class<T>) objects can also be obtained by resolving classes dynamically.