apt

sudo apt-get install python-software-properties
sudo apt-get install software-properties-common

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

sudo apt-get install oracle-java8-installer
java -version
java version “1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13) 
Java HotSpot(TM) Server VM (build 25.5-b02, mixed mode)

sudo update-java-alternatives -s java-8-oracle