It's just standard polymorphism. Take a look at
http://www.javaworld.com/javatips/jw-javatip30.html
to better understand interfaces and polymorphism.
Aaron
> -----Original Message-----
> From: Revathy Ravi [mailto:[EMAIL PROTECTED]]
> Sent: Friday, March 26, 1999 2:11 AM
> To: Aaron Porter
> Cc: [EMAIL PROTECTED]
> Subject: Re: Runtime information
>
>
>
>
> hello Aaron,
>
> Which version of functionofI() will it call?
>
>
> Revathy R.
> --------------------------------------------------------------
> --------------
>
>
>
> On Fri, 26 Mar 1999, Aaron Porter wrote:
>
> > You still have to cast to the interface.
> >
> > I i = (I) session.getValue("A");
> > i.functionofI(); // not i.functionofA()
> >
> >
> > > -----Original Message-----
> > > From: Revathy Ravi [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, March 25, 1999 11:58 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: Runtime information
> > >
> > >
> > > Hello everybody,
> > > The situation is like this.
> > >
> > > I have an interface say I . I have two classes, say A and B which
> > > implement this interface.
> > > I pass one of the object (say A) of these two classes in
> the session
> > > object. In the receiving servlet, I should be able to call
> > > the method of A
> > > without type casting or without checking.
> > >
> > > i.e., if I say Object o = session.getValue("A");
> > > o.functionofA();
> > > How to do this?
> > >
> > >
> > >
> > > Revathy R.
> >
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