Re: [xmlvm-users] Interface vs abstract classes

[Arno P. <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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