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Home > Programming > Programming Language > Java 9 Programming By Example
Java 9 Programming By Example
Java 9 Programming By Example

Java 9 Programming By Example: Your guide to software development

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Java 9 Programming By Example

The First Real Java Program - Sorting Names

In the previous chapter, we got acquainted with Java, and especially with using the REPL tool and interactively executing some simple code. That is a good start, but we need more. In this chapter, we will develop a simple sort program. Using this code as an example, we will look at different build tools, which are frequently used for Java projects, and learn the basic features of the Java language. This chapter will cover the following topics:

  • The sorting problem
  • The project structure and build tools
  • The Make, Ant, Maven, and Gradle build tools
  • Java language features related to the code example

Getting started with sorting

The sorting problem is one of the oldest programming tasks that an engineer deals with. We have a set of records and we know that we want to find a specific one sometime later, and we want to find that one fast. To find it, we sort the records in a specific order that helps us find the record we want quickly.

As an example, we have the names of students with their marks on some cards. When students come to the office asking for their results, we look through all of the cards one after the other to find the name of the enquiring student. However, it is better if we sort the cards by the names of the students alphabetically. When a student makes an enquiry, we can search the mark attached to the name much faster.

We can look at the middle card; if it shows the name of the student, then we are happy to have found the name and the mark. If the card precedes the name of the student...

Getting started with project structure and build tools

When a project is more complex than a single class, and it usually is, then it is wise to define a project structure. We will have to decide where we store the source files, where the resource files (those that contain some resource for the program, but are not Java source) are, where the .class files should be written by the compiler, and so on. Generally, the structure is mainly the directory setup and the configuration of the tools that perform the build.

The compilation of complex programs cannot be feasibly done using the command line issuing javac commands. If we have 100 Java source files, the compilation will require that many javac commands to be issued. It can be shortened using wild cards, such as javac *.java ,or we can write a simple bash script or a BAT command file that does that. First, it will be just 100 lines, each compiling one source...

Setting up the project with Maven

To start the project, we will use the directory structure and pom.xml that was created by Maven itself when we started with the following command line:

    $ mvn archetype:generate

It created the directories, the pom.xml file, and an App.java file. Now, we will extend this project by creating new files. We will code the sorting algorithm first in the packt.java9.by.example.stringsort package:

When we create the new package in the IDE, the editor will automatically create the stringsort subdirectory under the already existing src/main/java/packt/java9/by/example directory:

Creating the new Sort class using the IDE will also automatically create a new file named Sort.java in this directory, and it will fill in the skeleton of the class:

package packt.java9.by.example.stringsort; 

public class Sort { 
}

We will now have App.java containing the following code:

package packt.java9...

Coding the sort

Maven and the IDE created the files for the sort program. They form the skeleton for our code, and now it is time to grow some muscles on them to let it move. We spent quite some time to set up the project by visiting the different build tools, only to learn how to compile the code. I hope that this did not distract you much, but anyhow, we deserve to see some real code.

First, we will create the code for the sorting code, and after that, the code that invokes the sorting. The code that invokes the sorting is a kind of testing code. For simplicity, we will now simply use a public static void main method to start the code. We will use the test framework in later chapters.

As for now, the code for the sorting will look like this:

package packt.java9.by.example.stringsort; 

public class Sort { 

    public void sort(String[] names) { 
        int n = names.length; 
        while (n > 1) { 
           ...

Getting started with sorting

The sorting problem is one of the oldest programming tasks that an engineer deals with. We have a set of records and we know that we want to find a specific one sometime later, and we want to find that one fast. To find it, we sort the records in a specific order that helps us find the record we want quickly.

As an example, we have the names of students with their marks on some cards. When students come to the office asking for their results, we look through all of the cards one after the other to find the name of the enquiring student. However, it is better if we sort the cards by the names of the students alphabetically. When a student makes an enquiry, we can search the mark attached to the name much faster.

We can look at the middle card; if it shows the name of the student, then we are happy to have found the name and the mark. If the card precedes the name of the student alphabetically, then we will continue searching in the second half; otherwise, we will...

Getting started with project structure and build tools

When a project is more complex than a single class, and it usually is, then it is wise to define a project structure. We will have to decide where we store the source files, where the resource files (those that contain some resource for the program, but are not Java source) are, where the .class files should be written by the compiler, and so on. Generally, the structure is mainly the directory setup and the configuration of the tools that perform the build.

The compilation of complex programs cannot be feasibly done using the command line issuing javac commands. If we have 100 Java source files, the compilation will require that many javac commands to be issued. It can be shortened using wild cards, such as javac *.java ,or we can write a simple bash script or a BAT command file that does that. First, it will be just 100 lines, each compiling one source Java file to class file. Then, we will realize that it is only time, CPU, and power...

Setting up the project with Maven

To start the project, we will use the directory structure and pom.xml that was created by Maven itself when we started with the following command line:

$ mvn archetype:generate

It created the directories, the pom.xml file, and an App.java file. Now, we will extend this project by creating new files. We will code the sorting algorithm first in the packt.java9.by.example.stringsort package:

When we create the new package in the IDE, the editor will automatically create the stringsort subdirectory under the already existing src/main/java/packt/java9/by/example directory:

Creating the new Sort class using the IDE will also automatically create a new file named Sort.java in this directory, and it will fill in the skeleton of the class:

package packt.java9.by.example.stringsort; 

public class Sort { 
}

We will now have App.java containing the following code:

package packt.java9.by.example; 

public class App  
{ 
    public static void main( String[] args ) 
    { ...
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Key benefits

  • We bridge the gap between “learning” and “doing” by providing real-world examples that will improve your software development
  • Our example-based approach will get you started quickly with software programming, get you up-to-speed with Java 9, and improve your Java skills
  • This book will show you the best practices of Java coding and improve your productivity

Description

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.

Who is this book for?

This book is for anyone who wants to learn the Java programming language. You are expected to have some prior programming experience with another language, such as JavaScript or Python, but no knowledge of earlier versions of Java is assumed.

What you will learn

  • Compile, package and run a trivial program using a build management tool
  • Get to know the principles of test-driven development and dependency management
  • Separate the wiring of multiple modules from the application logic into an application using dependency injection
  • Benchmark Java execution using Java 9 microbenchmarking
  • See the workings of the Spring framework and use Java annotations for the configuration
  • Master the scripting API built into the Java language and use the built-in JavaScript interpreter
  • Understand static versus dynamic implementation of code and high-order reactive programming in Java
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Publication date : Apr 26, 2017
Length: 504 pages
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Language : English
ISBN-13 : 9781786468284
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Length: 504 pages
Edition : 1st
Language : English
ISBN-13 : 9781786468284
Category :
Programming
Languages :
Java
Concepts :
Programming Language
Tools :
Spring

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Table of Contents

10 Chapters
Getting Started with Java 9 Chevron down icon Chevron up icon
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
The First Real Java Program - Sorting Names Chevron down icon Chevron up icon
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
Optimizing the Sort - Making Code Professional Chevron down icon Chevron up icon
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
Mastermind - Creating a Game Chevron down icon Chevron up icon
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
Extending the Game - Run Parallel, Run Faster Chevron down icon Chevron up icon
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
Making Our Game Professional - Do it as a Webapp Chevron down icon Chevron up icon
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
Building a Commercial Web Application Using REST Chevron down icon Chevron up icon
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
Extending Our E-Commerce Application Chevron down icon Chevron up icon
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
Building an Accounting Application Using Reactive Programming Chevron down icon Chevron up icon
Building an Accounting Application Using Reactive Programming
Reactive... what?
Reactive programming in a nutshell
Reactive systems
Reactive streams
Reactive programming in Java
Summary
Finalizing Java Knowledge to a Professional Level Chevron down icon Chevron up icon
Finalizing Java Knowledge to a Professional Level
Java deep technologies
Programming in the enterprise
Summary

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Rating distribution
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Kindle Customer Jul 11, 2018
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very good book, useful examples
Amazon Verified review Amazon
Yarl, Paul Jul 29, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Love the format. Provides end-to-end coverage of modern Java development practices with overview of how improvements of Java 9 fit the bigger picture. Very easy to read and written in conversational tone. Appropriate for new and seasoned Java programmers alike.
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About the author

Profile icon Peter Verhas
Peter Verhas
LinkedIn icon
Peter Verhas is a senior software engineer and software architect with an electrical engineering and economics background from TU Budapest (MsC) and PTE Hungary (MBA), and he also studied at TU Delft and TU Vienna. He created his first programs in 1979, and since then he has authored several open source programs. He has worked in several positions in the telecommunications and finance industries. Peter works for EPAM Systems in Switzerland, participating in software development projects at various customer sites, and he supports talent acquisition by interviewing candidates, running training programs for developers, and internal mentoring programs. He regularly talks at various international conferences.
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We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela