Book Image

Java 9 Programming By Example

By : Peter Verhas
Book Image

Java 9 Programming By Example

By: Peter Verhas

Overview of this book

This book gets you started with essential software development easily and quickly, guiding you through Java’s different facets. By adopting this approach, you can bridge the gap between learning and doing immediately. You will learn the new features of Java 9 quickly and experience a simple and powerful approach to software development. You will be able to use the Java runtime tools, understand the Java environment, and create Java programs. We then cover more simple examples to build your foundation before diving to some complex data structure problems that will solidify your Java 9 skills. With a special focus on modularity and HTTP 2.0, this book will guide you to get employed as a top notch Java developer. By the end of the book, you will have a firm foundation to continue your journey towards becoming a professional Java developer.
Table of Contents (17 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Wait and notify


There are five methods implemented in the class Object that can be used to get further synchronization functionality: wait with three different timeout argument signature, notify, and notifyAll. To call wait, the calling thread should have the lock of the Object on which wait is invoked. It means that you can only invoke wait from inside a synchronized block, and when it is called, the thread gets BLOCKED and releases the lock. When another thread calls notify all on the same Object, the thread gets into the RUNNABLE state. It cannot continue execution immediately as it cannot get the lock on the object. The lock is held at that moment by the thread that just called notifyAll. However, sometime after the other thread releases, the lock gets out of the synchronized block, and the waiting thread continues the execution.

If there are more threads waiting on an object, all of them get out of the BLOCKED state. The notify method wakes only one of the waiting threads. There is no...