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.

Related Content you might be interested in

Current Title:

Small book image
Java 9 Programming By Example
Peter Verhas
Apr, 2017 | 504 pages
Small book image
Transitioning to Java
Ken Fogel
Apr, 2023 | 354 pages
Small book image
Modular Programming in Java 9
Koushik Srinivas Kothagal
Aug, 2017 | 298 pages
Small book image
Introduction to Programming
Nick Samoylov
Jun, 2018 | 722 pages
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

The HTTP protocol

The Hypertext Transport Protocol (HTTP) is built on top of the TCP. When you type a URL in a browser, the browser opens a TCP channel to the server (after DNS lookup, of course) and sends a HTTP request to the web server. The server, after receiving the request, produces a response and sends it to the client. After that, the TCP channel may be closed or kept alive for further HTTP request-response pairs.

Both the request and the response contain a header and an optional (possibly zero-length) body. The header is in the text format, and it is separated from the body by an empty line.

Note

More precisely the header and the body are separated by four bytes: 0x0D, 0x0A, 0x0D, and 0x0A, which are two CR, LF line separators. The HTTP protocol uses carriage return and line feed to terminate lines in the header, and thus, an empty line is two CRLF following each other.

The start of the header is a status line plus header fields. The following is a sample HTTP request:

GET /html/rfc7230...
Previous Section
End of Section 3
Next Section