This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Nested (aka inner) classes and assertions are not on OCAJP 7. And I believe wrapper classes are also covered in depth in the OCPJP 7 exam. For OCAJP7 you just need to know which wrapper class belongs to which primitive (e.g. Integer for int)