Java文档：从接口X继承的方法的含义是什么 [英] Java Documentation: What is meaning of 'methods inherited from interface X

问题描述

我必须在这里遗漏一些基本的Java术语：

I must be missing some basic Java terminology here:

类可以扩展，因此它们的方法可以通过其子方式继承类。

Classes can be extended, therefore their methods can be inherited by their sub-classes.

接口可以实现。实现类必须实现所有接口的方法 - 接口本身不实现任何东西，只声明。

Interfaces can be implemented. An implementing class will have to implement all of the interface's methods - the interface itself does not implement anything, only declares.

那么，当我查看文档的时候怎么样HashSet（ https://docs.oracle.com/ javase / 7 / docs / api / java / util / HashSet.html ），我看到接口 java.util中继承的方法列表。设置？

So, how come when I look at the documentation of HashSet (https://docs.oracle.com/javase/7/docs/api/java/util/HashSet.html), I see a list of methods which are inherited from interface java.util.Set ?

推荐答案

我想你是从生成的JavaDoc HTML中引用这样的语句：

I guess you are referring to the statements like this from the generated JavaDoc HTML:

从接口java.util.Set继承的方法...

Methods inherited from interface java.util.Set ...

在这个意义上的继承意味着所讨论的方法的签名是继承的，但不一定是实现。原因很简单：在Java中，您通常不会查看第三方代码的实现，而只会查看带有签名和JavaDoc的接口。

Inheritance in this sense means that the signature of the methods in question is inherited, but not necessarily the implementation. The reason for that is simple: In Java you usually do not look into the implementations of third party code, but only into the interfaces with their signatures and JavaDoc.

所以，基本上，这些方法的签名继承自接口 Set 并在 HashSet 或中实现AbstractSet 。因此，实际上它正在实现接口 Set 。

So, basically, the signatures of those methods are inherited from interface Set and implemented in the HashSet or AbstractSet. Hence, actually it is implementing the interface Set.

Sidenote ：在Java 8中，您可以使用Interfaces实现方法，但这是一个不同的故事。

Sidenote: In Java 8, you can have Interfaces implementing methods, but that's a different story.

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