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.
If you search the ranch for the many times that this has been asked before, you will find that the first thing you need to do is define what you mean by Pure Object Oriented. As there are many different definitions of this term, you will need to choose which you think is correct and then see how closely Java fits that definition.