1. Add OpenJDK PPA
sudo add-apt-repository ppa:openjdk-r/ppa
2. Update Package Cache
sudo apt-get update
3. Install OpenJDK 8
sudo apt-get install openjdk-8-jdk
4. Set Default Java
sudo update-alternatives --config java
sudo update-alternatives --config javac
sudo update-alternatives --config javadoc
5. Check Current Version
java -version
