Actually an interface class can extend multiple interface classes. This
sounds a bit strange but is very useful. A common usage in EJB is to
create a business interface for a bean that is extended by the remote
interface and implemented by the bean class. This allows signature
errors to be caught at compile time instead of deployment time.
A concrete or abstract class cannot extend multiple concrete or abstract
classes.
Scot.
Steve Stearns wrote:
>> It sure looks like everything is OK since public interface Category
>> extends
>> EJBObject and EJBObject is serializable. Often the problem is that the
>> method arguments don't implement java.io.Serializable. Try explicitly
>> making
>> Category extend java.io.Serializable as well.
>
> Java doesn't permit classes to extend more than one class. Since
> Category is already extending EJBObject, I cannot also have it extend
> Serializable. Also, since Category is itself an Interface I cannot
> have it implement the Serializable interface.
>
> ---Steve
>
>
>
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