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Modular Programming in Java 9

Modular Programming in Java 9

By : Kothagal
4.5 (2)
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Modular Programming in Java 9

Modular Programming in Java 9

4.5 (2)
By: Kothagal

Overview of this book

The Java 9 module system is an important addition to the language that affects the way we design, write, and organize code and libraries in Java. It provides a new way to achieve maintainable code by the encapsulation of Java types, as well as a way to write better libraries that have clear interfaces. Effectively using the module system requires an understanding of how modules work and what the best practices of creating modules are. This book will give you step-by-step instructions to create new modules as well as migrate code from earlier versions of Java to the Java 9 module system. You'll be working on a fully modular sample application and add features to it as you learn about Java modules. You'll learn how to create module definitions, setup inter-module dependencies, and use the built-in modules from the modular JDK. You will also learn about module resolution and how to use jlink to generate custom runtime images. We will end our journey by taking a look at the road ahead. You will learn some powerful best practices that will help you as you start building modular applications. You will also learn how to upgrade an existing Java 8 codebase to Java 9, handle issues with libraries, and how to test Java 9 applications.
Table of Contents (13 chapters)
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Compiling two modules

Now the module path (the src directory) has two modules. We can now run the javac command to compile all classes in both modules, since we are supplying src as the module source path.

Here, packt.sortutil is the simpler of the two modules. Since it doesn't have any external dependencies, this should just work like the packt.addressbook module did in the previous chapter. Let's look at the packt.addressbook module. Things are more interesting here. Since we've moved the sort related classes to the packt.sortutil module, the packt.addressbook module doesn't have the classes in the packt.util package anymore. But there is code in the module that still uses it. Notice what happens when we try to compile both the modules with the same command as the previous chapter. This time, since we are compiling two modules, we specify both the module...

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Modular Programming in Java 9
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