> If I have to redeclare all the methods in interface in the descended
> class then why not get rid of interface and I still have the same
> thing.
It's not the same thing.
Just because you have implemented methods Quack(), and Walk()
doesn't mean that a client application expecting to use your object
via the IDuck interface will recognise you as a Duck.
Interfaces give you a way to identify your capabilites to
outside applications. Exporting a particular interface is
a "contract" to provide some well-defined package of functionality
in a predictable way.
>What's wrong with that?
Nothing.
-ns
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