Book Image

Mastering Java 11 - Second Edition

By : Dr. Edward Lavieri, Mandar Jog
Book Image

Mastering Java 11 - Second Edition

By: Dr. Edward Lavieri, Mandar Jog

Overview of this book

Java 11 is a long-term release and its new features add to the richness of the language. It emphasizes variable-type inference, performance improvements, along with simplified multithreading. The Java platform has a special emphasis on modularity, making this the programming platform of choice for millions of developers. The modern Java platform can be used to build robust software applications, including enterprise-level and mobile applications. Fully updated for Java 11, this book stands to help any Java developer enjoy the richness of the Java programming language. Mastering Java 11 is your one-stop guide to fully understanding recent Java platform updates. It contains detailed explanations of the recent features introduced in Java 9, Java 10, and Java 11 along with obtaining practical guidance on how to apply the new features. As you make your way through the chapters, you'll discover further information on the developments of the Java platform and learn about the changes introduced by the variable handles and Project Coin, along with several enhancements in relation to import statements processing. In the concluding chapters, you'll learn to improve your development productivity, making your applications more efficient. You'll also be able to get to grips with the command-line flags with respect to various utilities and the command-line utility changes featured in the current Java platform. By the end of the book, you'll have obtained an advanced level understanding of the Java platform and its recent changes.
Table of Contents (20 chapters)

Storing interned strings in class-data sharing archives

In Java 5 through Java 8, the method in which strings were stored and accessed to and from CDS archives was inefficient, excessively time-consuming, and wasted memory. The following diagram illustrates the method by which Java stored interned strings in a CDS archive prior to Java 9:

The inefficiency stemmed from the storage schema. This was especially evident when the CDS tool dumped the classes into the shared archive file. The constant pools containing CONSTANT_String items have a UTF-8 string representation.

UTF-8 is an 8-bit variable-length character encoding standard.

The problem

With the use of UTF-8 prior to Java 9, the strings had to be converted to string...