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.
Well, there is some overlap but it is usually the case that a certain tool is better for a certain purpose than another tool. I can use both a wrench and a hammer to pound in a nail, but one is a heck of a lot easier to use.