for Java examples, use different artifactIds for every chapter & code version

[alexott]

Right now, all Java examples have the same artifactId: diningbyfriends - in this case, if you import several examples into Idea, then all of them will have the same project name, and it's harder to distinguish between them.

it would be useful to add the chapter number & variant into artifactId...

[joshperryman]

That's a very good point. Unless @bechbd can get to it this weekend, I think that I can wrap it up after finishing ch3 text review.

[alexott]

it's not urgent - maybe I can fix it if have time tomorrow...

[joshperryman]

that'd be appreciated, but your attention on the chapter text is more valuable

(though we certainly understand if you just want a break by spending some time with code/config)