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This article will help you to Install Oracle JAVA 8 (JDK/JRE 8u101) on Ubuntu 16.04, 15.10, 14.04 & 12.04 LTS and 10.04 and LinuxMint systems using PPA. To Install Java 8 in CentOS, Redhat and Fedora read This Article.
Installing Java 8 on Ubuntu

First you need to add webupd8team Java PPA repository in your system and install Oracle Java 8 using following set of commands.
Kod:
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
Verify Installed Java Version

After successfully installing oracle Java using above step verify installed version using following command.
Kod:
rahul@tecadmin:~$ java -version

java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)
Configuring Java Environment

In Webupd8 ppa repository also providing a package to set environment variables, Install this package using following command.
Kod:
sudo apt-get install oracle-java8-set-default
References:
https://launchpad.net/~webupd8team/+archive/java