For 2D games? Ehhh ... as much as I do love the language, it's not my first choice for such an application, particularly for a developer who I would think, is looking for a RAD style framework for 2D games more-so than general language skills.
For one evening that's not bad, certainly. Is this something you'd be happy to share the source code for, to allow people a bit of a look as to what Java dev is like? I have plenty of non-gaming things, but they hardly seem appropriate to show here.
Much obliged. Gives people a good idea of what Java looks like, what an evening's work might produce (although I am assuming general programming experience on your part helped there), that sort've thing.