Modular Programming in Java 9

Creating the module

Let's start by creating the new module packt.addressbook.ui. As before, create the module root folder with the same name in the project folder, and then create the module descriptor module-info.java. We already know that we need to depend on packt.contacts and packt.sortutil, so let's add those two dependencies first:

    module packt.addressbook.ui { 
      requires packt.sortutil; 
      requires packt.contact; 
    } 

We need to use the JavaFX libraries in this module, so we need to use the requires clause in the module descriptor to specify this dependency. How do we know what the libraries are? The answer is the same as earlier--using java --list-modules and java -d <module-name>. But before we browse for what modules to depend on, we ...