Book Image

Java 9: Building Robust Modular Applications

By : Dr. Edward Lavieri, Peter Verhas, Jason Lee
Book Image

Java 9: Building Robust Modular Applications

By: Dr. Edward Lavieri, Peter Verhas, Jason Lee

Overview of this book

Java 9 and its new features add to the richness of the language; Java is one of the languages most used by developers to build robust software applications. Java 9 comes with a special emphasis on modularity with its integration with Jigsaw. This course is your one-stop guide to mastering the language. You'll be provided with an overview and explanation of the new features introduced in Java 9 and the importance of the new APIs and enhancements. Some new features of Java 9 are ground-breaking; if you are an experienced programmer, you will be able to make your enterprise applications leaner by learning these new features. You'll be provided with practical guidance in applying your newly acquired knowledge of Java 9 and further information on future developments of the Java platform. This course will improve your productivity, making your applications faster. Next, you'll go on to implement everything you've learned by building 10 cool projects. You will learn to build an email filter that separates spam messages from all your inboxes, a social media aggregator app that will help you efficiently track various feeds, and a microservice for a client/server note application, to name just a few. By the end of this course, you will be well acquainted with Java 9 features and able to build your own applications and projects. This Learning Path contains the best content from the following two recently published Packt products: • Mastering Java 9 • Java 9 Programming Blueprints
Table of Contents (33 chapters)
Title Page - Courses
Packt Upsell - Courses
Taking Notes with Monumentum

Milling Project Coin [JEP 213]

Project Coin was a feature set of minor changes introduced in Java 7. These changes are listed as follows:

  • Strings in switch statements
  • Binary integral literals
  • Using underscores in numeric literals
  • Implementing multi-catch
  • Allowing for more precise re-throwing of exceptions
  • Generic instance creation improvements
  • Addition of the try-with-resources statement
  • Improvements to invoking varargs methods

Detailed information can be found in the following Oracle presentation:

JEP 213 focused on improvements to Project Coin's enhancements. There were five such enhancements, each detailed as follows.

Using the @SafeVarargs annotation

In Java 9, we can use the@SafeVarargsannotation with private instance methods. When we use this annotation, we are asserting that the method does not contain any harmful operations on the varargs passed as parameters to the method.

The syntax for usage is:

    @SafeVarargs // this is...