Re: [xmlvm-users] Interface vs abstract classes

[hassan k. <has...@gm...>]

Actually Interfaces are used to declare your first high level types in the
project while building skeleton, later you might need to (most of the time,
you should) use abstract classes since you will end up with common
methods\blocks ... you have a better chance to apply good technical designs
such as using template design pattern.


for example ;

IDataStore   (interface)
---- AbstractDataStore   (abstract)
-------- XmlDataStore      (concrete)
-------- TextFileDataStore (concrete)
-------- DBDataSource    (concrete)

The other use of interfaces is to have tagged interfaces, but I guess you do
not use it that much.

your comments are appreciated :) ...

Hassan


2010/9/12 Arno Puder <ar...@pu...>

>
> I think its a clever idea to have SecondOption implement FirstOption!
>
> Arno
>
>
> On 9/12/10 6:55 AM, Leo Izen wrote:
> > Do you mean:
> >
> > public interface FirstOption {
> >   public void someMethod();
> > }
> >
> > public abstract class SecondOption implements FirstOption {
> > }
> >
> > Because that would be a good idea. I support it.
> >
> > On Sun, Sep 12, 2010 at 6:33 AM, Arno Puder <ar...@pu...
> > <mailto:ar...@pu...>> wrote:
> >
> >
> >     right now we map Objective-C protocols to Java interfaces, except if
> >     there are optional methods in the protocol. In that case we map it to
> an
> >     abstract class.
> >
> >     Using Java interfaces and being able to make use of multiple
> inheritance
> >     leads to better designs, IMHO. Of course you can mimic it with
> abstract
> >     classes only but the resulting design is not as 'natural'. As far as
> I
> >     can tell, the majority of the Cocoa protocols do not have optional
> >     methods, so making abstract base classes the default seems like a
> >     drastic decision.
> >
> >     As a compromise, since you have mentioned a 'support' package that
> >     houses non-standard API, it would be possible to do both: Java
> >     interfaces and abstract base classes. This way the developer could
> >     choose which to use. There would be some redundancy, but if would
> offer
> >     developers a choice.
> >
> >     Thoughts, anyone?
> >
> >     Arno
> >
> >
> >     On 9/11/10 1:51 PM, Panayotis Katsaloulis wrote:
> >      > On 11 Σεπ 2010, at 5:44 μ.μ., Leo Izen wrote:
> >      >
> >      >> Java doesn't support multiple inheritance the way C++ does. This
> >     means that If you want your class to extend multiple types, you have
> >     to use interfaces.
> >      >
> >      > I know, I am not talking about general Java programming, but the
> >     specific implementation of ObjC library under Java.
> >      >
> >
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