Java中内部类的用途是什么？嵌套类和内部类是一样的吗？

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?

答

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