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.
I'm not sure I understand your question. Are you looking for a way to get a list of the names of people (or a single person) who got the highest grade, so that you can display it in a Swing application?
If so, such a query might look like this:
It's a bit simpler if you have students and grades in the same table.