Java 的“朋友"等价物? [英] 'Friends' equivalent for Java?

问题描述

这里在架构上有点问题.

having a little architectural trouble here.

在 C++ 中，我们有朋友"的概念，这样的朋友类可以访问私有成员.

In C++, we have the notion of 'friends,' where such friend classes can access private members.

所以，我正在开发一个 Java 应用程序并尝试遵循 MVC 架构.我有一个控制器类，用于管理map_objects"之间的图形连接.我想通过使用此控制器类隐藏 DTO 'map_objects' 中实际设置这些连接的函数.

So, I'm deving a Java app and trying to adhere to the MVC architecture. I've got a controller class that manages graph connectivity between 'map_objects.' I'd like to hide the function in the DTO 'map_objects' that actuall sets up these connectivities, by using this controller class.

(即，即使控制器类实现了设置连接所需的功能，用户"仍然可以直接访问 DTO 中的 setter/getter 函数以自行设置它们.)

(Ie, even if the controller class implements the required functionality of setting up connectivities, the 'users' can still access setter/getter functions in the the DTO directly to set them up themselves.)

在这方面有什么设计模式或技巧吗?(或者我完全搞砸了?)

Are there any design patterns or tips in this regard? (Or have I totally mucked up?)

重复 有没有办法在 Java 中模拟 C++ 的朋友"概念?

推荐答案

(不)幸运的是，Java 中没有直接的 C++ 朋友等效项.但是，Java 访问级别修饰符 可以为您提供帮助.特别是，私有或包私有(又名包保护，或默认")可能会有所帮助.

(Un)fortunately, there is no direct C++ friend equivalent in Java. However, the Java access level modifiers can assist you. In particular, private or package private (AKA package protected, or "default") may help.

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