GNU/Linux Ubuntu 18.04 Installing Java JDK Guide
Hello Linux user! This tutorial will guide you step-by-step on How to Install Oracle Java SE Development Kit on Ubuntu 18.04 Bionic LTS GNU/Linux.
And the Oracle Java SE Ubuntu Bionic Release includes:
- OpenJDK Java Development Kit
- Oracle Java Development Kit
Moreover, the Java OpenJDK (Open Java Development Kit) is the Free and Open Source Implementation of the Java Platform, Standard Edition (Java SE).
Where the Oracle JRE/JDK is based on the OpenJDK Source Code. In Addition, it contains Closed-Source Components.

GNU/Linux Ubuntu 18.04 Java Development Kit Installation Guide