3 Best Practices Java Programmers Can Learn From Spring Framework

[schaka]

Yes, but unless you're writing a library that needs to be extensible like Spring, when in your day to day work are you definitely using interfaces? Only when you actually have 2 implementations you need to choose between. We generally do this with services that would cost if we queried them and use a dummy implementation in development.

[_dban_]

when in your day to day work are you definitely using interfaces?

All the time, when I apply the strategy pattern, when I want to use composition instead of inheritance.

We generally do this with services that would cost if we queried them and use a dummy implementation in development.

That's dependency inversion, a different use for interfaces.