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.

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Table of Contents (17 chapters)
Title Page
Title Page
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
Getting Started with Java 9
Getting Started with Java 9
Getting started with Java
Installing Java
Executing jshell
Packaging classes into a JAR file
Managing the running Java application
Using an IDE
Summary
2
The First Real Java Program - Sorting Names
The First Real Java Program - Sorting Names
Getting started with sorting
Getting started with project structure and build tools
Setting up the project with Maven
Coding the sort
Understanding the algorithm and language constructs
Compiling and running the program
Summary
3
Optimizing the Sort - Making Code Professional
Optimizing the Sort - Making Code Professional
The general sorting program
A brief overview of various sorting algorithms
Project structure and build tools
Code the sort
Creating unit tests
Collections with wrong elements
Handling exceptions
Generics
Test Driven Development
Implementing QuickSort
Creating modules
Summary
4
Mastermind - Creating a Game
Mastermind - Creating a Game
The Game
The model of the game
Java collections
Dependency injection
Implementing the game
The Game class
Creating an integration test
Summary
5
Extending the Game - Run Parallel, Run Faster
Extending the Game - Run Parallel, Run Faster
How to make Mastermind parallel
Refactoring
Processes
Threads
Fibers
java.lang.Thread
Pitfalls
ExecutorService
Variable access
The CPU heartbeat
Volatile variables
Synchronized block
Wait and notify
Lock
Atomic classes
BlockingQueue
IntervalGuesser
ParallelGamePlayer
Microbenchmarking
Summary
6
Making Our Game Professional - Do it as a Webapp
Making Our Game Professional - Do it as a Webapp
Web and network
The HTTP protocol
HTTP/2.0
Cookies
Client server and web architecture
Writing servlets
Java Server Pages
HTML, CSS, and JavaScript
Mastermind servlet
Running the Jetty web servlet
Logging
Other technologies
Summary
7
Building a Commercial Web Application Using REST
Building a Commercial Web Application Using REST
The MyBusiness web shop
Sample business architecture
Microservices
Service interface design
JSON
REST
Model View Controller
Spring framework
Service classes
Compiling and running the application
Testing the application
Servlet filters
Audit logging and AOP
Dynamic proxy-based AOP
Summary
8
Extending Our E-Commerce Application
Extending Our E-Commerce Application
The MyBusiness ordering
Setting up the project
Order controller and DTOs
Consistency checker
Annotations
Using reflection
Functional programming in Java
Scripting in Java 9
Summary
9
Building an Accounting Application Using Reactive Programming
Building an Accounting Application Using Reactive Programming
Reactive... what?
Reactive programming in a nutshell
Reactive systems
Reactive streams
Reactive programming in Java
Summary
10
Finalizing Java Knowledge to a Professional Level
Finalizing Java Knowledge to a Professional Level
Java deep technologies
Programming in the enterprise
Summary

Spring framework

The Spring framework is a huge one with several modules. The first version of the framework was released in 2003, and since then, there have been four major releases delivering new and enhanced features. Currently, Spring is the de facto enterprise framework used, perhaps more widely than the standard EJB 3.0

Spring supports dependency injection, Aspect-Oriented Programming (AOP), persistence for SQL and NoSQL databases in a conventional and Object Relational Mapping way, transactional support, messaging, web programming, and many other features. You can configure it using XML configuration files, annotations, or Java classes.

Architecture of Spring

Spring is not monolithic. You can use a part of it, or only some of the features. You can include some of the modules of Spring that you need and leave out others. Some modules depend on some others, but Gradle, Maven, or some other build tool handles that.

The following image shows you the modules of the Spring framework for version...

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