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

java.lang.Thread

As everything in Java (well, almost) is object, if we want to start a new thread, we will need a class that represents the thread. This class is java.lang.Thread built into the JDK. When you start a Java code, the JVM automatically creates a few Thread objects and uses them to run different tasks that are needed by it. If you start up VisualVM, you can select the Threads tab of any JVM process and see the actual threads that are in the JVM. For example, the VisualVM as I started it has 29 live threads. One of them is the thread named main. This is the one that starts to execute the main method (surprise!). The main thread started most of the other threads. When we want to write a multithread application, we will have to create new Thread objects and start them. The simplest way to do that is new Thread(), and then calling the start method on the thread. It will start a new Thread that will just finish immediately as we did not give it anything to do. The Thread class, as...

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