How to Install OpenJDK 7 on Ubuntu 13.04, 12.10 and 12.04

Hello Linux Geeksters.

In this article I will show you how to install OpenJDK 7 on Ubuntu 13.04 Raring Ringtail, Ubuntu 12.10 Quantal Quetzal and Ubuntu 12.04 Precise Pangolin. If you do not like Oracle Java (Oracle JDK) you can install this one.

Also, install the IcedTea plugin for the Internet Browser:
$ sudo apt-get install icedtea-7-plugin openjdk-7-jre

For developement, you would also want openjdk-7-jdk:

$ sudo apt-get install openjdk-7-jdk