Messed around with Java during high school. Nothing serious. It helped me understand OO programming at the time. Used it during first computer science courses of college. Today I've used it to tinker with Android.
Learned C to write my senior project in high school. I implemented an interpreted language that was actually my gateway into Python (the next year). I enjoy messing with C from time to time.
Learned C++ taking college classes during senior year of high school. Mostly did school assignments with it. Most notable was the final class project which was a simulation of Monopoly. Would love to dig that up again.