I can never remember this, so for mainly for my reference and anybody else who may Google this.
- Get Java via the Synaptic Update Manager
- sudo vi /etc/bash.bashrc and add the following to the end of the file:
JAVA_HOME=/usr/lib/jvm/java-6-sun export JAVA_HOME
- Close your command window and reopen
- echo $JAVA_HOME to confirm it is set