GNU/Linux Elementary OS 5.1 Installing Java Guide
Hello Linux user! This tutorial will guide you step-by-step on How to Install Oracle Java SE on Elementary OS 5.x GNU/Linux.
And the Oracle Java SE Elementary OS 5 Release includes:
- Java Runtime Environment to Run Java Software
- Java Development Kit to Develop Java Software
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 Elementary OS 5.1 Java SE Installation Guide