How To Install Java JDK and JRE on Oracle Linux Server 9

Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible.
OpenJDK or Oracle Java

OpenJDK is an open-source implementation of the Oracle Java SE platform edition. Oracle develops Oracle Java SE, whereas the OpenJDK is developed by Oracle Corporation, OpenJDK and Java Community, Red Hat, Azul Systems, IBM, Apple Inc, and SAP SE.