java networking

I want to make an application that communicates over the network in java. Just something that I can give to someone else and we can send information back and forth given an IP address. What are some good online tutorials for me to look at?

>>6
I picked java because I'm already familiar with swing and I figured java would be simpler and have a lot of documentation. What would you suggest? I know c, c++, and python too. Would those be any better?