This post explains how to install Java or check which version is running on your machine. Install on any OS, and learn about the JDK.

Which version of Java should you use in Linux? Learn how to easily switch between different versions with a tutorial from Jack Wallen.

If you have a need for Java Servlets, you'll probably want to deploy Tomcat. Jack Wallen walks you through this process on the Ubuntu Server 16.04 platform.