Linux Java Installation Guide
You are Welcome! The linked Tutorials Show You Step-by-Step How to Install Java JRE/JDK on GNU/Linux Distributions.
And the OpenJDK for Linux (Open Java Development Kit) is a Free and Open Source Implementation of the Java Platform, Standard Edition (Java SE).
Finally, Oracle Java JDK/JRE for Linux is based on the OpenJDK source code. But in Addition, it contains Closed-Source Components.