[0x445442]

I've just recently started using Java 8 on the job and what's really jumped out at me is the slight of hand of the Function interface. By simply creating a generic interface called Function and "tricking" developers into coding to an interface things like IOC containers and mocking libraries are no longer needed.

I don't need Spring to auto wire in dependencies in order to simplify testing. In my test class I can just whip up whatever dummy implementation I want and create add a constructor for the Unit Under Test to inject that implementation manually.

The other thing that's been rolling around in my mind using Java 8 with the Function interface is; if you want to expose architecture issues and other warts in the code base, disallow the use of mocking test frameworks.