The upcoming Java 9 release delivers a brand new module system as its flagship feature. In this course, Java 9 Modularity: First Look, both the concepts and practice behind modular development are introduced. First, you'll learn what modules are and how modular design using the Java module system increases the flexibility, maintainability, and security of your applications. Next, using a Java 9 Early Access release, these concepts are illustrated with real, working code. Finally, the issue of migrating existing applications to the new Java module system is addressed as well, with features such as automatic modules. When you're finished with this course, terms like encapsulation and explicit module dependencies will be no secret to you. After this course, you'll be ready for modular development with Java 9.