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.
If you're studying for SCBCD, you should be using at least one book, which should contain such explanations. If you haven't bought any yet, you can look for tutorials, like this one (Eclipse, not Netbeans, but you should be able to figure out how to do it in Netbeans).