由于一些中间构造函数调用，没有 PerfHelper 类型的封闭实例可用 [英] No enclosing instance of type PerfHelper is available due to some intermediate constructor invocation

问题描述

考虑以下代码:

class abstract Normal1 extends Something 
{
}

class Outer 
{
  class abstract Inner extends Normal1
  {

  }
}

class General extends Outer.Inner  // Problem occurs at this 
{
}

我得到的错误是由于某些中间构造函数调用，没有可用的 PerfHelper 类型的封闭实例"

The error I am getting is "No enclosing instance of type PerfHelper is available due to some intermediate constructor invocation"

我的问题是我可以像上面那样扩展内部类吗?

My question is can I extend the inner class like above ?

推荐答案

将内部类声明为 static 并且您应该能够扩展它:

Declare the inner class as static and you should be able to extend it:

class outer {
  static abstract class inner extends normal1 { }
}

如果inner不是抽象的，它和outer绑定，并且只有在outer的实例存在时才能存在.检查这是否是您真正想要的.

If inner is not abstract, it's tied to outer, and can only exist when an instance of outer exists. Check to see if this is what you really want.

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