우분투 11.10에 JDK설치하는 방법이다..
* OpenJDK 설치..

sudo apt-get install openjdk-7-jdk

* Sun JDK 설치..

sudo add-apt-repository ppa:ferramroberto/java
sudo apt-get update
sudo apt-get install sun-java6-jdk sun-java6-plugin

* Reference
– http://blog.sudobits.com/2011/09/14/how-to-install-jdk-on-ubuntu-11-10/