Your version number may vary depending on when you’re installing the software. In this case, you would need Oracle JDK 11.0.7. In this image, the version of the script is 11.0.7. Locate the package for Focal, as shown in the following figure: To find out which version you need, visit the oracle-java11-installer page. The version of Oracle’s JDK you’ll need to download must match version of the installer script. Then you can use apt to install it with help from a third party installation script. To install the Oracle JDK, which is the official version distributed by Oracle, you must create an Oracle account and manually download the JDK to add a new package repository for the version you’d like to use. Oracle’s licensing agreement for Java doesn’t allow automatic installation through package managers. Next, let’s look at how to install Oracle’s official JDK and JRE. If Java is not currently installed, you’ll see the following output: Next, check if Java is already installed: To install this version, first update the package index: By default, Ubuntu 20.04 includes Open JDK 11, which is an open-source variant of the JRE and JDK. The easiest option for installing Java is to use the version packaged with Ubuntu. One Ubuntu 20.04 server set up by following the the Ubuntu 20.04 initial server setup guide tutorial, including a sudo non- root user and a firewall.When you’re finished, you’ll be able to use the JDK to develop software or use the Java Runtime to run software. You’ll then select the version you wish to use for your projects. You’ll install OpenJDK as well as the official JDK from Oracle.

In this guide, you will install various versions of the Java Runtime Environment (JRE) and the Java Developer Kit (JDK) using apt. Java and the JVM (Java’s virtual machine) are required for many kinds of software, including Tomcat, Jetty, Glassfish, Cassandra and Jenkins.

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