GNU/Linux openSUSE Tumbleweed Installing Java OpenJDK 15 – Step by step Guide
How to Install Oracle-Sun OpenJDK 15 JRE/JDK in openSUSE Tumbleweed GNU+Linux Systems.
And Java OpenJDK 15 for openSUSE Tumbleweed (Open Java Development Kit) is a Free and Open Source Implementation of the Java Platform, Standard Edition (Java SE).
Moreover, the Oracle Java JDK/JRE is based on the OpenJDK Source Code. In Addition, it contains Closed-Source Components.

Possibly see also: How to Download and Install Oracle JDK on openSUSE Tumbleweed.
1. Terminal QuickStart
How to QuickStart with Command Line on openSUSE
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