JDK 1.7 Install

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

 

If you want to install the latest JDK 1.8, use the webupd8team PPA. Add the repository in your system:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update

You can now install Oracle Java 8 using the following command:

sudo apt-get install oracle-java8-installer

This ppa repository also provides a package to set environment variables automatically. Just type :

sudo apt-get install oracle-java8-set-default