How to make an outer class inherited from an inner class?

Question

How can I make something like this work:

class Outer {
  int some_member;

  abstract class InnerBase {
    abstract void method();
  }
}

class OuterExtends         


        

Answer 1

Well your problem is that every instance of InnerBase (I know it's abstract) has to have a reference to an Outer object. That is part of the semantics of nested classes. Instantiating OuterExtendsInner would need such a reference. You can avoid that making InnerBase a static nested class.