Unbuntu compilers

yo I am new to linux. I used mandrake a little when I was in college. I want to practice writing code in ubuntu. I have 7.10 and I just recently installed it. I have installed and added some programs but I still can’t figure out what programs I used to actually write code. Like I am trying to review C/C++ and learn Java. The only thing I seem to keep finding, is a program that will run python. Or will let me code in python. Can anybody help me out here?

Run Synaptic.