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https://openjdk.java.net/install/
OpenJDK: Download and install
How to download and install prebuilt OpenJDK packages JDK 9 & Later Oracle's OpenJDK JDK binaries for Windows, macOS, and Linux are available on release-specific pages of jdk.java.net as .tar.gz or .zip archives. As an example, the archives for JDK 13 may
openjdk.java.net
apt-get install default-jdk
https://www.baeldung.com/ubuntu-install-jdk
Installing Java on Ubuntu | Baeldung
Learn how to install OpenJDK and Oracle JDK versions 8 through 11 on Ubuntu systems.
www.baeldung.com
$ sudo add-apt-repository ppa:linuxuprising/java
$ sudo apt update
$ sudo apt install oracle-java11-installer
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