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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
Buy this Book

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
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Title Page
Credits
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Credits
About the Author
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About the Author
About the Reviewer
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About the Reviewer
www.PacktPub.com
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www.PacktPub.com
Customer Feedback
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Customer Feedback
Preface
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Preface
Free Chapter
1
Getting Started with Java 9
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Getting Started with Java 9
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Getting started with Java
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Installing Java
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Executing jshell
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Packaging classes into a JAR file
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Managing the running Java application
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Using an IDE
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Summary
2
The First Real Java Program - Sorting Names
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The First Real Java Program - Sorting Names
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Getting started with sorting
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Getting started with project structure and build tools
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Setting up the project with Maven
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Coding the sort
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Understanding the algorithm and language constructs
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Compiling and running the program
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Summary
3
Optimizing the Sort - Making Code Professional
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Optimizing the Sort - Making Code Professional
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The general sorting program
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A brief overview of various sorting algorithms
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Project structure and build tools
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Code the sort
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Creating unit tests
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Collections with wrong elements
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Handling exceptions
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Generics
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Test Driven Development
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Implementing QuickSort
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Creating modules
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Summary
4
Mastermind - Creating a Game
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Mastermind - Creating a Game
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The Game
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The model of the game
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Java collections
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Dependency injection
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Implementing the game
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The Game class
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Creating an integration test
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Summary
5
Extending the Game - Run Parallel, Run Faster
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Extending the Game - Run Parallel, Run Faster
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How to make Mastermind parallel
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Refactoring
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Processes
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Threads
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Fibers
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java.lang.Thread
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Pitfalls
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ExecutorService
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Variable access
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The CPU heartbeat
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Volatile variables
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Synchronized block
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Wait and notify
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Lock
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Atomic classes
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BlockingQueue
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IntervalGuesser
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ParallelGamePlayer
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Microbenchmarking
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Summary
6
Making Our Game Professional - Do it as a Webapp
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Making Our Game Professional - Do it as a Webapp
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Web and network
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The HTTP protocol
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HTTP/2.0
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Cookies
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Client server and web architecture
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Writing servlets
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Java Server Pages
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HTML, CSS, and JavaScript
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Mastermind servlet
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Running the Jetty web servlet
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Logging
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Other technologies
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Summary
7
Building a Commercial Web Application Using REST
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Building a Commercial Web Application Using REST
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The MyBusiness web shop
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Sample business architecture
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Microservices
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Service interface design
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JSON
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REST
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Model View Controller
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Spring framework
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Service classes
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Compiling and running the application
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Testing the application
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Servlet filters
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Audit logging and AOP
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Dynamic proxy-based AOP
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Summary
8
Extending Our E-Commerce Application
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Extending Our E-Commerce Application
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The MyBusiness ordering
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Setting up the project
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Order controller and DTOs
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Consistency checker
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Annotations
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Using reflection
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Functional programming in Java
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Scripting in Java 9
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Summary
9
Building an Accounting Application Using Reactive Programming
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Building an Accounting Application Using Reactive Programming
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Reactive... what?
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Reactive programming in a nutshell
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Reactive systems
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Reactive streams
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Reactive programming in Java
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Summary
10
Finalizing Java Knowledge to a Professional Level
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Finalizing Java Knowledge to a Professional Level
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Java deep technologies
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Programming in the enterprise
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Summary

The MyBusiness ordering

The ordering process is a little bit more complicated than just looking up products. The order form itself lists products and amounts, and identifies who the customer for that order is. Identifiers give the products. All that we have to do is check that the products are available in our store, and we can deliver them to the given customer. This is the simplest approach; however, with some products, there are more restrictions. For example, when somebody orders a desk-side lamp, we deliver the power cord separately. The reason for this is that the power cord is specific to the country. We deliver different power cords to the United Kingdom and to Germany. One possible approach could be to identify the country of the customer. But this approach does not take into account that our customers are resellers. All customers could be located in the United Kingdom, and at the same time they may want to deliver the lamp with the power cable to Germany. To avoid such situations...

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