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
Preface
25
Taking Notes with Monumentum
Bibliography
Index

Enhanced method handles [JEP-274]


The Enhanced Method Handles JEP-274 was to improve the following listed classes, to make common usage easier with improved optimizations:

  • MethodHandle class
  • MethodHandles class
  • MethodHandles.Lookup class

The listed classes are all part of the java.lang.invoke package, which has been updated as part of the Java 9 platform. The improvements were made possible through the use of lookup refinement and MethodHandle combinations for loops and try...finally blocks.

In this section, we will look at the following regarding JEP-274:

  • Reason for the enhancement
  • Lookup functions
  • Argument handling
  • Additional combinations

Reason for the enhancement

This enhancement stemmed from developer feedback and the desire to make the MethodHandle, MethodHandles, and MethodHandles.Lookup classes much easier to use. There was also the call to add additional use cases.

The changes resulted in the following benefits:

  • Enabled precision in the usage of the MethodHandle API
  • Instantiation reduction
  • Increased...