外部类之外的类访问非静态内部类

class Out
{
        class In
        {
                public In(String msg)
                {
                        System.out.println(msg);
                }
        }
}
public class CreateInner
{
        public static void main(String[] args)
        {
                 in;
                Out out = new Out();
                in = out.new In("test");
        }
}

那么非静态内部类怎么在外部类之外创建一个子类呢？

public class SubClass extends 
{
        public SubClass(Out out)
        {
                out.super("hello");
        }
}