This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
I did an online quiz on java earlier and I got to a question that asked when I should use interfaces and when to use abstract clases. I realize that I never thought much about this. Basically, I use instinct to decide when to use which. I don't really have a golden rule in regard to this principle. can anybody help?