Extension vs defender methods

[Neal Gafter]

Both interfaces and abstract classes define contracts.  Both are intended
to be subtyped.

2011/11/14 "Zdeněk Troníček" <tronicek at fit.cvut.cz>

> In addition, they are different on purpose. Interfaces define contracts
> and abstract classes are classes that are intended to be subclassed.
>
> Z.T.
> --
> Zdenek Tronicek
> FIT CTU in Prague
>
>
> Neal Gafter napsal(a):
> > On Sun, Nov 13, 2011 at 1:08 AM, Llewellyn Falco
> > <isidore at setgame.com>wrote:
> >
> >> the "standard" naming for interfaces w/non-abstract methods is: "an
> >> abstract class"
> >>
> >
> > Abstract classes (but not interfaces) may have state, and interfaces (but
> > not abstract classes) may be multiply inherited.  So they are not the
> same
> > thing.
> >
> >
>
>
>