Java类可访问性 [英] Java Class Accessibility

问题描述

与我的其他问题略有关联：以下内容之间有何区别：

Slightly related to my other question: What is the difference between the following:

private class Joe
protected class Joe
public class Joe
class Joe

再一次，最后2的差异是我最感兴趣的。

Once again, the difference between the last 2 is what I'm most interested in.

推荐答案

任何包中的类都可以访问公共类。

A public class is accessible to a class in any package.

具有默认访问权限的类（ class Joe ）仅对同一个包中的其他类可见。

A class with default access (class Joe) is only visible to other classes in the same package.

private和protected修饰符只能应用于内部类。

The private and protected modifiers can only be applied to inner classes.

私有类只对其封闭类和同一封闭类中的其他内部类可见。

A private class is only visible to its enclosing class, and other inner classes in the same enclosing class.

受保护的类对同一个包中的其他类以及扩展封闭类的类是可见的。

A protected class is visible to other classes in the same package, and to classes that extend the enclosing class.

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