Now that you are comfortable creating, compiling, and executing a simple Java 9 module, let's update it and start adding address book viewer functionality.
The following informal class diagram shows how we'll design the application classes to begin with:
The main class has the main() method that displays the list of contacts in ascending order, sorted by the lastName property. It gets the list of contacts by calling the ContactUtil.getContacts() method and it sorts it using SortUtil.sortList(). It then displays the list of contacts to the console.
We'll start with a new model class Contact, which represents a single piece of contact information. Apart from the obvious contact-related private member variables and getters and setters, this class also has a couple of additions that'll come in handy later:
- The constructor with arguments: This makes it easy for us to create contact objects. This is useful since we'll be hardcoding our contact list to begin with...