This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Hi Radouane In my exam there wasn't a specific question on ThreadGroup and I guess that it isn't there, but I am not sure. You can get to know more about ThreadGroup from here and here. All I got in the exam was how to use it in a Thread constructor.