Search icon CANCEL
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Java Projects
Java Projects

Java Projects: Learn the fundamentals of Java 11 programming by building industry grade practical projects , Second Edition

eBook
€20.98 €29.99
Paperback
€36.99
Subscription
Free Trial
Renews at €18.99p/m

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Table of content icon View table of contents Preview book icon Preview Book

Java Projects

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 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 soon. 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 dean's cabin asking for their results, we look through all of the cards one after the other to find the name of the inquiring student. However, it is better if we sort the cards by the names of the students alphabetically. When a student makes an inquiry, 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 (the ones 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 wildcards, such as javac *.java, or we can write a simple bash script or a BAT command file which does that. First, it will be just 100...

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.java11.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/java11/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.java11.example.stringsort;

public class Sort {
}

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

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 setting 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:

var n = names.length;
while (n > 1) {
    for (var j = 0; j < n - 1; j++) {
        if (names[j].compareTo(names[j + 1]) &gt...

Understanding the algorithm and language constructs

The algorithm was explained at the start of the chapter. The implementation is in the Sort class inside the sort() method, and it consists only of a few lines:

var n = names.length;
while (n > 1) {
    for (var j = 0; j < n - 1; j++) {
        if (names[j].compareTo(names[j + 1]) > 0) {
            final var tmp = names[j + 1];
            names[j + 1] = names[j];
            names[j] = tmp;
        }
    }
    n--;
}

The n variable holds the length of the array at the start of the sorting. Arrays in Java always have a property that gives the length, and it is called length. When we start the sorting, we will go from the start of the array to the end of it and, as you may recall, the last element, Wilson, will walk up to the last position during this first iteration. Subsequent iterations will be shorter and, therefore...

Compiling and running the program

Finally, we will compile and execute our program from the command line. There is nothing new in this one; we will only apply what we have learned in this chapter using the following two commands:

$ mvn package

This compiles the program, packages the result into a JAR file, and finally executes the following command:

$ java -cp target/SortTutorial-1.0.0-SNAPSHOT.jar packt.java11.example.App

This will print the following result on the command line:

Summary

In this chapter, we have developed a very basic sort algorithm. It was made purposefully simple so that we could reiterate the basic and most important Java language elements, classes, packages, variables, methods, and so on. We also looked at build tools, so we are not empty-handed in the next chapters when projects will contain more than just two files. We will use Maven and Gradle in the upcoming chapters.

In the very next chapter, we will make the sort program more complex, implementing more efficient algorithms and also making our code flexible, giving us the opportunity to learn more advanced Java language features.

Left arrow icon Right arrow icon
Download code icon Download Code

Key benefits

  • Explore advanced technologies that Java 11 delivers such as web programming and parallel computing
  • Discover modern programming paradigms such as microservices, cloud computing and enterprise structures
  • Build highly responsive applications with this practical introduction to Reactive programming

Description

Java is one of the most commonly used software languages by programmers and developers. In this book, you’ll learn the new features of Java 11 quickly and experience a simple and powerful approach to software development. You’ll see how to use the Java runtime tools, understand the Java environment, and create a simple namesorting Java application. Further on, you'll learn about advanced technologies that Java delivers, such as web programming and parallel computing, and will develop a mastermind game. Moving on, we provide more simple examples, to build a foundation before diving into some complex data structure problems that will solidify your Java 11 skills. With a special focus on the features of new projects: Project Valhalla, Project Panama, Project Amber, and Project Loom, this book will help you get employed as a top-notch Java developer. By the end of the book, you’ll have a firm foundation to continue your journey toward becoming a professional Java developer.

Who is this book for?

This book is for anyone who wants to learn the Java programming language. No programming experience required. If you have prior experience, it will help you through the book more easily.

What you will learn

  • Compile, package, and run a program using a build management tool
  • Get to know the principles of test-driven development
  • Separate the wiring of multiple modules from application logic
  • Use Java annotations for configuration
  • Master the scripting API built into the Java language
  • Understand static versus dynamic implementation of code
Estimated delivery fee Deliver to France

Premium delivery 7 - 10 business days

€10.95
(Includes tracking information)

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Aug 31, 2018
Length: 524 pages
Edition : 2nd
Language : English
ISBN-13 : 9781789131895
Vendor :
Oracle
Category :
Languages :

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Estimated delivery fee Deliver to France

Premium delivery 7 - 10 business days

€10.95
(Includes tracking information)

Product Details

Publication date : Aug 31, 2018
Length: 524 pages
Edition : 2nd
Language : English
ISBN-13 : 9781789131895
Vendor :
Oracle
Category :
Languages :

Packt Subscriptions

See our plans and pricing
Modal Close icon
€18.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
€189.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
€264.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total 110.97
Mastering Java 11
€36.99
Java Projects
€36.99
Learning Java by Building Android  Games
€36.99
Total 110.97 Stars icon

Table of Contents

11 Chapters
Getting Started with Java 11 Chevron down icon Chevron up icon
The First Real Java Program - Sorting Names Chevron down icon Chevron up icon
Optimizing the Sort - Making Code Professional Chevron down icon Chevron up icon
Mastermind - Creating a Game Chevron down icon Chevron up icon
Extending the Game - Run Parallel, Run Faster Chevron down icon Chevron up icon
Making Our Game Professional - Do it as a Web App Chevron down icon Chevron up icon
Building a Commercial Web Application Using REST Chevron down icon Chevron up icon
Extending Our E-Commerce Application Chevron down icon Chevron up icon
Building an Accounting Application Using Reactive Programming Chevron down icon Chevron up icon
Finalizing Java Knowledge to a Professional Level Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Half star icon Empty star icon Empty star icon Empty star icon 1.9
(9 Ratings)
5 star 11.1%
4 star 11.1%
3 star 0%
2 star 11.1%
1 star 66.7%
Filter icon Filter
Top Reviews

Filter reviews by




Atomsk Jan 23, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book is great for someone with solid Java knowledge looking to improve their skills.
Amazon Verified review Amazon
Mihail Gaberov Sep 25, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Great for someone who wants to learn quickly the basics of Java language and use them directly in real life projects! Bravo!
Amazon Verified review Amazon
Jared Josafhat Hernández Zúñiga Jul 18, 2019
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
Is really hard to follow if you don't have experience with "Maven" in the first chapter it "explains" how to create a basic project using archetype but in the second chapter it uses another approach to build the unit testing & sorting new project so this book is really hard to follow
Amazon Verified review Amazon
Saleh Abuo-Tamma Mar 28, 2020
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Unfortunately I waste my money and time to try this book. I tried really really hard to follow the book and downloaded Linux distro, downloaded all the build tools, and did every possible choice, yet I couldn't understand the book. The writer spends almost 150 pages (out of 514) talking about build tools and very technical details that totally distract the reader! Even as an Android programmer, I suffered A LOT with this book! The projects' ideas are good, PLEASE make a new version with clearer demonstrations and much lesser building distractions...
Amazon Verified review Amazon
anil petkar Sep 21, 2019
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
I am not satisfied with this book
Amazon Verified review Amazon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is the delivery time and cost of print book? 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
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

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