Java中内部类的用途是什么？嵌套类和内部类是一样的吗？ [英] What are the uses of inner classes in Java? Are nested classes and inner classes the same?

问题描述

可能重复：

Java内部类和静态嵌套类

Java中内部类的用途是什么？嵌套类和内部类是否相同？

What are the uses of inner classes in Java? Are nested classes and inner classes the same?

推荐答案

不，它们不一样：内部类是非 static 。

No, they're not the same: an inner class is non-static.

JLS 8.1.3内部类和附件实例

内部类是一个嵌套类，未显式或隐式声明为静态。

JLS 8.1.3 Inner Classes and Enclosing Instances

An inner class is a nested class that is not explicitly or implicitly declared static.

另请参阅Joe Darcy的下图：

Consult also the following diagram from Joe Darcy:

Joseph D. Darcy's Oracle Weblog - Nested, Inner, Member, and Top-Level Classes

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