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

Compact strings [JEP 254]

The string data type is an important part of nearly every Java app. While JEP 254's aim was to make strings more space-efficient, it was approached with caution so that existing performance and compatibilities would not be negatively impacted.

Pre-Java 9 status

Prior to Java 9, string data was stored as an array of chars. This required 16 bits for each char. It was determined that the majority of String objects could be stored with only 8 bits, or 1 byte of storage. This is due to the fact that most strings consist of Latin-1 characters.


The ISO Latin-1 Character Set is a single-byte set of character's encodings.

New with Java 9

Starting with Java 9, strings are now internally represented using a byte array along with a flag field for encoding references.