#apt-get install build-essential

Python 2.7.3 is already installed

If your image have not preinstalled javac,

#apt-get install openjdk-7-jdk

or refer to http://linux-sunxi.org/Oracle_Java for Oracle Java (hint: this page has been deleted due to spam)

is provided here ORACLE Download page for JDK 8 early access

This version for ARM supports hardware floating point unit on ARM V7

look for the Entry "Linux ARMv6/7 VFP, HardFP ABI"

Here is the ORACLE instruction for RaspBerry PI.