Tecadmin published a guide about installing Java on Ubuntu 20.04.

How to Install Java on Ubuntu 20.04

Java is the most popular object oriented, robust, platform independent programming language. There are multiple applications required for your system required Java on your system. This guide will help you to install Java (OpenJDK 11 and OpenJDK 8) stable releases on your Ubuntu 20.04 LTS (Focal Fossa) operating system. You will also find the instruction’s to switch between multiple installed Java versions.

How to Install Java on Ubuntu 20.04