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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

Running the Jetty web servlet

Since we have included the Jetty plugin into our Gradle build, the targets of the plugin are available. To start Jetty is as easy as typing the following:

gradle jettyRun

This will compile the code, build the WAR file, and start the Jetty servlet container. To help us remember, it also prints the following on the command line:

Running at http://localhost:8080//hello

We can open this URL and see the opening screen of the game with the colors that the program created as a first guess:

Now it is time to have some fun and play with our game, giving answers to the program. Do not make it easy for the code! Refer to the following screenshot:

At the same time, if you look at the console where you have typed gradle jettyRun, you will see that the code is printing out log messages, as shown in the following screenshot:

These printouts come through the logger that we have in our code. In the previous chapters, we used the System.out.println method calls to send informational...

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