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.
Sierra & Bates Book for SCJP 5 training states that Has-a relationship always rely on instance variables.
With the book I got a CD with simulation of the exam + got one bonus exam for free.
In the bonus exam there was a question about Has-A relationship and "Has-a relationship always rely on instance variables." was one option which was not true. Explanation was that also classes static references are considered as HAS-A relationship.