Inner Class是继承到OuterClass的subClass吗？

Question

I tried below code and according to it I have the understanding that inner class is inherited to OuterClass's subclass.Is it correct?

    class Outter{
    int i=1;
    class Inner{
        int i=2;
        public void hello(){
            System.out.println("hello from outter.inner");
        }
    }
}

    class ChildClass extends Outter{
        class ChildInner{

        }
    }
    public class Classes {
        public static void main(String[] args) {
            Inner inner = (new ChildClass()).new Inner();
            System.out.println(inner.i);
            inner.hello();
        }
    }

Output as excepted:

2

hello from outter.inner

Inner inner = (new ChildClass()).new Inner();

As this line of code worked it should mean that Inner class is inherited to ChildClass

I am getting confused because of the below statement I found on Link

When an outer class is extended by it's sub class, Member inner classes will not be inherited to sub class. To use inner class properties inside the sub class of outer class, sub class must also have an inner class and that inner class must extend inner class of the outer class.

Answer 1

So I will illustrate that statement with an example:

When an outer class is extended by it's sub class, Member inner classes will not be inherited to sub class. To use inner class properties inside the sub class of outer class, sub class must also have an inner class and that inner class must extend inner class of the outer class.

class Outter {      
    void method(){
       Inner test=new Inner();
       test.i=5; //No problem to do that even if i is private because it is inner class
    } 
    class Inner {
        private int i = 2; 
    }
}

class ChildClass extends Outter{
     void method2(){
        Inner test=new Inner();
        test.i=5;  //Does not compile
        }
}

You cannot access "i" in the child class. And if you also extend the inner there you can:

class ChildClass extends Outter{
 void method2(){
    Inner2 test=new Inner2();
    test.i=5;  //Compiles fine because we have also extended the inner class (like written in the quoted text)
    }

 class Inner2 extends Inner{     }
}

Answer 2

The statement:

Inner inner = (new ChildClass()).new Inner();

Is not really inherited to ChildClass

If you break it you are basically doing this:

ChildClass child = new ChildClass();
Inner inner = child.new Inner();

Now you can call new Inner() on the ChildClass because it extends Outter

This doesn't mean that ChildClass can call any of the methods/properties inside Inner just because Inner is part of Outter