是否必须在className.java中编写类className？ [英] Is it necessary that class className must be coded in className.java?

问题描述

我正在使用maven来构建项目并且编译失败，因为我在 Test.java 中放了类 Test2 ，

I'm using maven to build the project and compile failed because I put class Test2 in Test.java,

但这是因为maven还是因为java本身不支持这个？

but is it because of maven or simply because java itself doesn't support this?

BTW，如何用eclipse打开maven项目？

BTW,how can I open a maven project with eclipse?

推荐答案

A public 名为 ClassName 的类必须（在大多数情况下）在名为 ClassName.java 的文件中定义。

A public class called ClassName must (in most cases) be defined in a file called ClassName.java.

编辑

虽然这不是Java语言的要求，但大多数（如果不是全部） Java的实现，上面提到的类名和文件名之间的关系必须保持，否则将导致编译器错误。

Although this is not a requirement of the Java language, most (if not all) implementations of Java, the above mentioned relationship between the class name and file name must hold, or a compiler error will result.

（有关更多信息，请参阅 Jon Skeet的回答。）

(For more information, please refer to Jon Skeet's answer.)

re通过阅读第7.2节：软件包可以找到这方面的内容 Java语言规范，第三版。

在本节中，它描述了如何将目录结构映射到 Java中的完全限定类名，这导致要求 .class 包含类的字节码的文件必须位于类似于完全限定类名的路径中。

In the section, it describes how the directory structure can be mapped to a fully-qualified class name in Java, which leads to a requirement that the .class file which contains the bytecode for a class must reside in a path that resembles that of the fully-qualified class name.

原始答案错误地声明命名方案是一项要求已被编辑。

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