How Interfaces are calling Object class methods?

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We all know Interfaces are not classes and so interfaces do not inherit any class and even do not inherit object class.

But when we Implement a interface in a class and override the object class method in that class, then we can call that object class method overridden in our child class from the interface(by interface reference variable).

How can interface call personal methods of child class?

Answer Please..........

Posted 5-Jun-12 1:10am

Mahesh Kumar Badgujar

Updated 5-Jun-12 22:27pm

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AmitGajjar 6-Jun-12 5:57am

didn't get your last line : "How can interface call personal methods of child class?" can you elaborate ?

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Satish32 · Answer 1 · 2012-06-05T01:20:00

Solution 1

when you say ImyInterface obj = new ImplementedClass(), obj is actually pointing to the reference of ImpletedCalss object instance on the heap and hence it is able to access the method on the object.

Posted 5-Jun-12 1:20am

Satish32

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Mahesh Kumar Badgujar 5-Jun-12 7:24am

But if we create our own method Let say "public void Show()" in child class.
In this case also the Interface Obj(reference) points to the reference of the child class object on heap.

Then why it says that interfaces can't call personal methods of it's child class.

Sergey Alexandrovich Kryukov · Answer 2 · 2012-07-18T19:34:00

Solution 2

Answering the follow-up question:

There is no such thing as "personal method". It can be called, via type cast. It cannot be called directly only because the run-time type is not known exactly, but it's known that it is of the type System.Object.

—SA

Posted 18-Jul-12 19:34pm

Sergey Alexandrovich Kryukov

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Espen Harlinn 19-Jul-12 17:59pm

That's right :-D

Sergey Alexandrovich Kryukov 19-Jul-12 23:55pm

Thank you, Espen.
--SA