How to install Java 8 on Ubuntu

1.
 sudo add-apt-repository -y ppa:webupd8team/java

2.
sudo apt-get update

3. accept the oracle jdk8 license automatically
echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | sudo /usr/bin/debconf-set-selections

4.
sudo apt-get install oracle-java8-installer

5.
sudo apt-get install oracle-java8-set-default

6. verify installed java version
java -version