This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Hi Satishind, API says "Some collections allow duplicate elements and others do not " So I guess, you cannot really say a) is true. I have come across this kind of answer before... and I wondered myself.... correct me if I am wrong here.. thanks