Java 9 modules

When writing an application in Java 9, you are ideally creating a modular application. It's important to note that a modular Java application isn't just a regular Java application (like those we've been building all these years) with just an extra module feature thrown in. It actually calls for a completely new way of thinking about writing and structuring your code base. Before we get into creating Java 9 modules, let's do a quick recap of the traditional Java code structure pre-Java 9.