# 96 - Creating SOLID Code: Dependency Inversion Principle

Thank you so much for this series.  It has been very much a nice refresher on things we all should know and practice.

Great stuff. Thanks!

You are exchanging ABSTRACT base classes (report, reportprinter...) for the interfaces, although in the begining you are talking that it is fine to depend upon abstractions, e.g. abstract classes.

I would understand changing classic implementations, but not empty abstract base classes...

CONFUSED!

Thank you for presenting the SOLID principles in such an accessible way, the other day when i've heard "Interface Segregation" in a podcast and went like "Aha, that one". Great job!

Thank you so much for all your great work. I feel that you are providing a great service to the programming community and you should be commended.

Just one comment on this episode but it may be a subject for a later dimecast. Wouldn't the super classes for Report and ReportPrinter have become redundant and so be able to refactor back to just a single concrete class?

I guess this is more a point for discussion rather then something that would be presented in this dimecast due to time.

Continue the great work :)

Really good stuff.Thanks

@Eric:

Yes, there are absolutely several 'issues' that remain within the 'final' codebase and represent additional opportunities to improve the design; you have identified at least one of them.

Others (in this installment as well in several others of them) have pointed out many places where the 'design' still evidences some code-smells and could stand to be improved.

Without trying to make 'excuses' for my work, I think that the important parts of the series are NOT the results per-se but the concepts and the process.  Living within the constraints of the 10-minute time-frame meant some trade-offs in re: the 'perfection' of the results, but the point (of course) was much less about the results and much more about getting the principles across to viewers (as I think you are pointing out).

Thanks again for the feedback and I'm glad you were able to find value in the content!

-Steve B.

excellent webcasts, thanks Stephen.

Thanks for good work with SOLID presentations.

As HumanIam mentioned, there is no reason for replacing abstract classes with interfaces, you can demonstrate DI as good with them. Then you could focus more on DI benefits and implement Eriks suggestion.

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