Скачать или смотреть OpenJDK 21 installation on Rocky Linux 9 | How to install Java 21 on Linux with JAVA_HOME

In this video we are going to see how to install OpenJDK 21 on Rocky Linux 9 for all users with JAVA_HOME Environment Variable

In this Example:

src ---- contains two java modules UrlValidator and UrlValidatorClient Modules. Each Module must contain module-info.java which is mandatory.
classes ---- will store all the compiled class files of Java Modules.

Here UrlValidator Module contains module-info.java which exports the com.javafrm package, so that other modules can access the package and com.javafrm package contains UrlValidator.java.
Class name and Method should be public, then only you can access this class and required methods from other modules.

Next UrlValidatorClient Module contains contains module-info.java which requires (calls) UrlValidator Module.
It contains org.javafrm package which contains UrlValidatorClient.java (Main class) and access the class and methods from UrlValidator Module.

Example commands:

javac --module UrlValidatorModule -d /opt/Java-Module-Programs/Modules/classes --module-source-path /opt/Java-Module-Programs/Modules/src

javac --module UrlValidatorClientModule -d /opt/Java-Module-Programs/Modules/classes --module-source-path /opt/Java-Module-Programs/Modules/src

java --module-path /opt/Java-Module-Programs/Modules/classes --module UrlValidatorClientModule/org.javafrm.UrlValidatorClient

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