Java on Ubuntu

1:Open your terminal

2:To make sure you don't have Open JDK installed type this
command into your terminal: sudo apt-get purge openjdk*

3:Your going to need to add the PPA so type in this command: sudo add-apt-repository ppa:webupd8team/java

4:Then you need to update your repo index by typing this command in: sudo apt-get update

5:Type in the corresponding command below to pick what java you want to install

To install Java 8 type In this command:
sudo apt-get install oracle-java8-installer

To install Java 7 type in this command:
sudo apt-get install oracle-java7-installer

To install Java 6 type in this command:
sudo apt-get install oracle-java6-installer

6:Type in this command to update your repo index again:
sudo apt-get update