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 Veena, The Sun site will tell you what is on the exam, but quoting from it: Section 7 (second bullet) 'Recognize conditions that might prevent a thread from executing.' Section 9 (first bullet) 'Make appropriate selection of collection classes/interfaces to suit specified behavior requirements' From this it sounds like you should do both! If it's any help, I didn't cover interrupt(), but did do Iterator and ListIterator in Collections, and I passed. Other people may have different ideas though. Good Luck, Helen