JPMS是否支持模块版本? [英] Does JPMS support module version?

问题描述

我认为JPMS不支持模块版本.但是，当我执行java --list-modules时，会有以下输出:

I thought that JPMS doesn't support module version. However, when I do java --list-modules I have the following output:

java.activation@9
java.base@9
java.compiler@9
java.corba@9
java.datatransfer@9
java.desktop@9
java.instrument@9 
....

所以，我不明白这个@9是什么.是这个版本还是什么?如果JPMS支持模块版本，是否可以在模块A的module-info中设置，该模块A需要特定版本的模块B?

So, I can't understand what this @9 is. Is this version or what? If JPMS supports module version, can I set in module-info of module A, that module A requires module B of certain version?

推荐答案

我不明白这是@ 9是什么.是这个版本还是什么?

I can't understand what this @9 is. Is this version or what?

是的，它是模块的版本.

Yes, it is the version of the module.

如果JPMS支持模块版本，我可以在模块A的module-info中进行设置， 该模块A需要特定版本的模块B?

If JPMS supports module version, can I set in module-info of module A, that module A requires module B of certain version?

否，您不能在另一个模块的声明中引用模块的特定版本.我相信模块系统的状态#Module总是清楚地提到了这一点.声明

No, you cannot refer a specific version of a module in another module's declaration. I believe this was always clearly mentioned in The State of the Module System#Module Declarations

模块的声明不包含版本字符串，也不包含对其依赖的模块的版本字符串的约束.这是有意的，因为这不是解决版本选择问题，最好将其用于构建工具和容器应用程序.

A module’s declaration does not include a version string, nor constraints upon the version strings of the modules upon which it depends. This is intentional as it is not a goal of the module system to solve the version-selection problem, which is best left to build tools and container applications.

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