How to Install Java Compiler / javac in Ubuntu

This article will show you how to install the java compiler in Ubuntu (Linux)

1. Open the Terminal
2. Type in sudo apt-get install openjdk-7-jdk
3. You will be asked for authorization and confirmation of the download and once finished you can start using the compiler 

Now in case you get this message E: unable to locate package openjdk-7-jdk

1. Type in sudo apt-get update to update the packages
2. Then type in sudo apt-get install openjdk-7-jdk again.