I do not think I would mention it to management.
I think 2 .. 4 classes
you wrote
would be enough.
Most interviewers won't have the time to look at them.
Some pin heads, the kind in Dilbert, think a code portfolio is a nice piece of paper work. What's really important, is when you get to the interview with the techno-geek, you score well.
I don't believe it's ethical to leave any samples or photocopies with your prospective. If your a student, open source developer or a volunteer then you may do as you please.
Seldom have I seen a code sample asked for.