Install Oracle Java Developement Kit on Ubuntu Linux

Simply and fast way to install jdk on Linux.
Add repository:
sudo add-apt-repository ppa:webupd8team/java 
Update repository list:
sudo apt-get update
Install package:
sudo apt-get install oracle-jdk7-installer 
That's all folks! Really simply and fast!

If you want to remove:
sudo apt-get remove oracle-jdk7-installer   

And..if you want to install openjdk (open source better ;)
sudo apt-get install openjdk-6-jdk

Rememeber: default JRE locations is /usr/lib/jvm/