It is the new way of programming components named modules that have been introduced in Java 9. A module is the own-defined collection of code and information(Data) and has a name to recognize it.
The below-given enhancements have been added in Java 9 with the Module Component-
Below are the steps to create a Module named com.intellinuts.greetings
Step-1
Create a folder C:\>JAVA\src. Now make a folder com.intellinuts.greetings and it is the same as the module we are creating.
Step-2
Create a module-info.java in C:\>JAVA\src\com.intellinuts.greetings folder with the given code.
Module-info.java
module com.intellinuts.greetings { }
Module-info.java is the file which is used to make modules. We have created a module named com.intellinuts.greetings in this step. By convention, this file must reside in the folder whose name is the same as the module name.
Step-3
Now, we have to add the source code in the module. Create a Java9Testter.java in C:\>JAVA\src\com.intellinuts.greetings\com\intellinuts\greetings folder with the help of following code.
Java9Tester.java
package com.intellinuts.greetings; public class Java9Tester { public static void main(String[] args) { System.out.println("Hello World!"); } }
By convention, a source code of a module will lie in the same directory which is the name of the module.
Step-4
Create a folder C:\>JAVA\mods. Now, create a folder com.intellinuts.greetings and it is the same as the name of the module we have created. Now assemble the module to the mods directory.
C:/ > JAVA > javac -d mods/com.intellinuts.greetings src/com.intellinuts.greetings/module-info.java src/com.intellinuts.greetings/com/intellinuts/greetings/Java9Tester.java
Step-5
Let’s run the module to see the result. Right the below-given command.
C:/>JAVA>java --module-path mods -mcom.intellinuts.greetings/com.intellinuts.greetings.Java9Tester
Here module path gives the module location as mods and -m signifies the main module.
Output
You will see the output like this:
Hello World!