Scala的内部类和Java的内部/嵌套类之间有什么区别？ [英] What are the differences between Scala’s inner classes and Java’s Inner/nested classes?

问题描述

Scala如何处理内部类与Java的嵌套，静态或非静态类不同？

How does Scala handle inner classes differently to Java's nested, static or non-static, classes?

推荐答案

主要区别如果你有

class Outer {
  class Inner {
    def foo(x: Inner): Inner = this // just for the example below
  }
}

和 Outer的两个实例：

val a = new Outer
val b = new Outer

然后 a.Inner 和 b.Inner 是两种不同的类型（在Java中，它们都是 Outer.Inner ），这样你就做不到了

then a.Inner and b.Inner are two different types (where in Java they'd both be Outer.Inner), so that you can't do

val aInner = new a.Inner
val bInner = new b.Inner
aInner.foo(bInner)

他们确实有常见的超类型写的外＃内。

They do have a common supertype which is written Outer#Inner.

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