Hi
Pages 19-22 of javainterface.pdf explains this. Basically when you
create an interface you are defining a new type much the same as
defining a class. Any object that implements an interface can be
referenced by not only it's class type but also by it's interface type.
This allows you to enforce any 'contracts' that require objects to be
not only of particular types but also implementing particular
interfaces. So you get compile time checking, and you can also do
things at run time like:
if (NewClass instanceof NewInterface) {...}
Hope this helps. I'd still re-read the PDF if you're still unclear on
this.
Cheers
Nic
On 14/12/2009, at 7:53 AM, nn roh wrote:
> Hi all,
>
> I am trying to do the homework , i didnt get this line :
>
> AddressInterface getAddress(); how can a method return an
> interface ? can any one elaborate ..
>
>
> Thanks,
> Nada
>
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