Overridden method called using a base reference that points to a derived object, what will be invoked at run-time?

Question

Question: When an overridden method is called using a base reference that refers to a derived object, which version of the method is invoked at run-time?

I think it would be the method that was overridden, since its called by just a reference to the derived object; correct?

I think your question has to do with static/dynamic binding. Read the answer to this question http://stackoverflow.com/questions/16647590/static-binding-and-dynamic-binding — almightyGOSU, May 27 '15 at 02:42

score 1 · Answer 1 · answered May 27 '15 at 02:36

1

Yes, method of the derived object will be called.

answered May 27 '15 at 02:36

tec

41
9

score 1 · Answer 2 · answered May 27 '15 at 02:41

Yes, derived object method will be called. Use the following example to experience.

public class Main {
  public static void main(String[] args) {
        B b = new B();
        print(b);
    }

    public static void print(A a) {
        System.out.println(a.run());
    }
}

class A{
    public String run () {
       return "A";
    }
}

class B extends A{
    public String run () {
        return "B";
    }
}

Overridden method called using a base reference that points to a derived object, what will be invoked at run-time?

2 Answers2