Install Java on Ubuntu 20.04 with apt package manager

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Java and JVM (Java Virtual Machine) are required for many types of popular software, including Tomcat, Jetty, Glassfish, Cassandra and Jenkins.

check if Java is already installed:

java -version

First, update the package lists:

sudo apt update

Install OpenJRE:

sudo apt install default-jre

Type y (yes) and press Enter to resume installation.

Confirm Java version:

java -version

You may need the Java Development Kit (JDK) in addition to the JRE in order to compile and run some specific Java-based software. To install the JDK, execute the following command, which will also install the JRE:

sudo apt install default-jdk

Verify that the JDK is installed by checking the version of javac, the Java compiler:

javac -version

I am a Devops Engineer, but I would describe myself as a Tech Enthusiast who is a fan of Open Source, Linux, Automations, Cloud and Virtualization. I love learning and exploring new things so I blog in my free time about Devops related stuff, Linux, Automations and Open Source software. I can also code in Python and Golang.

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