Java 类可访问性 [英] Java Class Accessibility

问题描述

与我的其他问题略有相关:以下有什么区别:>

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

private class Joe
protected class Joe
public class Joe
class Joe

再说一次，最后两个的区别是我最感兴趣的.

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可见，同一个封闭类中的其他内部类也可见.

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

受保护的类对同一包中的其他类以及扩展封闭类的类可见.

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

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