How to override a indirectly invoked method

I am not very sure how to title this question properly, I will just try to describe it as clear as I can blow.

Interface InterfaceB {
  void methodB();
}

Class ClassB implements InterfaceB {
  void methodB() {
    //...
  }
}

Class ClassA {
  InterfaceB methodA() {
    return new ClassB();
  }
}

---

Class MyClass {
  public static void main(String[] args) {
    ClassA a = new ClassA();
    InterfaceB b = a.methodA();
    b.methodB();  // override this guy
  }
}

I want to override methodB, without change ClassA and ClassB. Appreciate any ideas.