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

Pitfalls


We have already discussed many of the problems that we may face when developing parallel program. In this section, we will summarize them with the usual terminology used for the problems. Terminology is not only interesting, but it is also important when you talk with colleagues to easily understand each other.

Deadlocks

Deadlock is the most infamous parallel programming pitfall, and for this reason, we will start with this one. To describe the situation, we will follow the metaphor of bureaucrats.

The bureaucrat has to stamp a paper he has in his hand. To do that, he needs the stamp, and he also needs the inkpad. First, he goes to the drawer where the stamp is and takes it. Then, he walks to the drawer where the inkpad is and takes the inkpad. He inks the stamp, pushes on the paper. Then, he puts the stamp back to its place and then the inkpad back in its place. Everything is nice, we are on cloud 9.

What happens if another bureaucrat takes the inkpad first and then the stamp second...