How to install Oracle JDK 21 in Linux Mint 21 with JAVA_HOME Environment Variable

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java frm

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Published on January 11, 2024 7:44:45 AM ● Video Link: https://www.youtube.com/watch?v=f6V-lhqNj8w

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Tutorial

Duration: 8:22

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In this video we are going to see How to install Oracle JDK 21 in Linux Mint 21 for all users with JAVA_HOME Environment Variable and How to Compile and Run Java Module Program.

In this Example

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

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

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

Example Java Commands:

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

javac --module TreeSortClientModule -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 TreeSortClientModule/org.javafrm.TreeSortClient

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