为什么“受保护”？ Java中的修饰符允许访问同一个包中的其他类？ [英] Why does the "protected" modifier in Java allow access to other classes in same package?

问题描述

在Java中，具有protected修饰符的成员不仅可以由同一个类和子类访问，还可以由同一个包中的每个人访问，这是什么原因？

What is the reason that in Java, a member with a "protected" modifier can not only be accessed by the same class and by subclasses, but also by everyone in the same package?

我想知道语言设计的原因，而不是实际的应用程序（例如，测试）

I am wondering about language design reasons, not actual applications (e.g., testing)

推荐答案

这种设计基于这样的想法：包是适当的单位，由一个内部一致的团队维护和发布;继承关系与谁维持和释放什么时间的关系要少得多。

This design is based on the idea that the package is the appropriate unit, maintained and released by one internally consistent team; inheritance relationships have much less to do with who's maintaining and releasing what when.

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