Java  is one of the most popular programming languages and the JVM  (Java’s virtual machine ) is the run-time environment to run Java applications. These two platforms are required for much popular software that includes Tomcat , Jetty , Cassandra , Glassfish,  and Jenkins .

Installing the Default JRE in Ubuntu

The painless way for installing Java is to use the version that comes with Ubuntu repositories. By default, Ubuntu packages with OpenJDK 11, which is an open-source alternative of the JRE and JDK.

Installing the Default JDK in Ubuntu

Once JRE installed, you might also need the JDK (Java Development Kit) in order to compile and run a Java-based application.

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