GNU/Linux Mint 20 Install OpenJDK Guide
Hi! The Tutorial shows you Step-by-Step How to Install Oracle Java OpenJDK JRE/JDK on GNU+Linux Mint 20.x Ulyana/Ulyssa/Uma/Una LTS Mate/Cinnamon/Xfce Desktop.
And the OpenJDK Mint 20 Installation is a Free and Open Source Implementation of the Java Platform Standard Edition.
Oracle Java JDK/JRE 8/10 Installation 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 Linux Distros.

OpenJDK Installation on Linux Mint
Java IDEs Installation for Linux Mint 20
How to Install Eclipse for Java Development on Linux: Installing Eclipse IDE for Java on Linux.
How to Install Netbeans IDE for Java on Linux: Installing NetBeans IDE for Java on Linux.
How to Install IntelliJ IDEA 2024 for Java on Linux: Installing IntelliJ IDEA for Java on Linux.