什么是静态嵌套类？ [英] What is a static nested class?

问题描述

可能重复：

Java：静态与非静态内部类

<什么是静态嵌套类？
静态和非静态嵌套类之间的区别是什么？

What is a static nested class? What is the difference between static and non-static nested classes?

推荐答案

静态内部类是嵌套的类在另一个具有 static 修饰符的类中。它与顶级类几乎完全相同，除了它可以访问其内部定义的类的私有成员。

A static inner class is a class nested inside another class that has the static modifier. It's pretty much identical to a top-level class, except it has access to the private members of the class it's defined inside of.

class Outer {
    private static int x;
    static class Inner1 {
    }
    class Inner2 {
    }
}

Class Inner1 是一个静态内部类。 Class Inner2 是一个非静态的内部类。两者之间的区别在于，非静态内部类的实例永久地附加到 Outer 的实例 - 您无法创建 Inner2 没有 Outer 。不过，您可以单独创建 Inner1 对象。

Class Inner1 is a static inner class. Class Inner2 is an inner class that's not static. The difference between the two is that instances of the non-static inner class are permanently attached to an instance of Outer -- you can't create an Inner2 without an Outer. You can create Inner1 object independently, though.

中的代码， Inner1 和 Inner2 都可以访问x;不允许其他代码。

Code in Outer, Inner1 and Inner2 can all access x; no other code will be allowed to.

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