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.
You are looking both the for loops differently. The basic for loop is for boolean (ba) that is declared as array. The enhanced for loop is for Set, because the type of collection(generic<> is not specified here, the things come out from Set is Object.