Book Image

Java 9 with JShell

By : Gaston C. Hillar
Book Image

Java 9 with JShell

By: Gaston C. Hillar

Overview of this book

The release of Java 9 has brought many subtle and not-so-subtle changes to the way in which Java programmers approach their code. The most important ones are definitely the availability of a REPL, known as JShell, which will make experiments and prototyping much more straightforward than the old IDE-based project-led approach. Another, more subtle change can be seen in the module system, which will lead to more modularized, maintainable code. The techniques to take full advantage of object-oriented code, functional programming and the new modularity features in Java 9 form the main subjects of this book. Each chapter will add to the full picture of Java 9 programming starting out with classes and instances and ending with generics and modularity in Java.
Table of Contents (23 chapters)
Java 9 with JShell
Credits
About the Author
Acknowledgement
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Creating modular source code


Now it is time to start creating the necessary directory structures, and write the code for the module-info.java files and the source Java files for each module. We will create the com.renderer.math module.

Create a directory named Renderer and a src sub-directory. We will use Renderer/src (Renderer\src in Windows) as our base directory for the source code. However, take into account that you don't need to create any folder in a case where you download the source code.

Now create the com.renderer.math directory in Renderer/src (Renderer\src in Windows). Add the following lines to a file named module-info.java in the recently created sub-folder. The next lines compose the module descriptor for a module named com.renderer.math. The code file for the sample is included in the java_9_oop_chapter_13_01/Renderer/src/com.renderer.math sub-folder, in the module-info.java file.

module com.renderer.math {
    exports com.renderer.math;
}

The module keyword followed by the...