Re: Using abstract class that implements interface
Tom Anderson wrote:
On Sun, 19 Apr 2009, Mark Space wrote:
cbossens73@yahoo.fr wrote:
One of them being that it can make testing *very* difficult.
This.
It is true that an OO interface can be defined in Java both by
using a Java interface of a Java "class" (either abstract or not),
but the latter is often poor design...
Abstract base classes are good for providing a common
implementation, which is what the OP has done. But I agree that
adding an interface which also expresses the design is a
no-brainer.
At minimum, what happens if you have only a abstract class, and
want
to add your API to an existing class, or one that must extend
another?
Then you refactor to separate an interface from the base class,
which
is trivial to do, with or without a refactoring browser. Why on
earth
would you do it before you need to?
If you're writing a 10-class application where you write all the code
yourself, no reason at all. If you're creating a framework that
you're going to distribute widely, create the interface now because
changing all the APIs in version 2 is impolite.
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