Coding Bat is a
place where you can sharpen your skills in both
Java and Pythhon.
Java the Hard Way is a good resource for the
enterprising. The first 16 chapters are free, and it
is reasonably priced for 45 bucks. This gives a nice
introduction to compilling and running Java right
at the command line.
Bucky provide a fabulous learning resource.
Open a code window, view his tutorials, and follow