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  • Book Overview & Buying Java 9 Programming By Example
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Java 9 Programming By Example

Java 9 Programming By Example

By : Peter Verhas
4.5 (2)
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Java 9 Programming By Example

Java 9 Programming By Example

4.5 (2)
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)
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Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Lock


Locks are built in Java; every Object has a lock that a thread may acquire when it enters a synchronized block. We discussed that already. In some programming code, there are situations when this kind of structure is not optimal.

In some situations, the structure of locks may be lined up to avoid deadlock. It may be needed to acquire lock A before B and to acquire B before C. However, A should be released as soon as possible, not to prevent access to resource protected by lock D, but also needing lock A before it. In complex and highly parallel structures, the locks are structured many times into trees where accessing a resource a thread should climb down along the tree to a leaf representing the resource. In this climbing, the thread gets hold of a lock on a node, then a lock on a node below it, and then releases the lock above, just like a real climber descending (or climbing up if you imagine the tree with the leafs at the top, which is more realistic, nevertheless graphs usually...

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