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Book:
Java 9 Recipes: A Problem-Solution Approach
Author:
Josh Juneau
Publisher:
Apress
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Books / Computer
Year:
2017
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Quickly find solutions to dozens of common programming problems encountered while building Java applications. Content is presented in the popular problem-solution format. Look up the programming problem that you want to resolve. Read the solution. Apply the solution directly in your own code. Problem solved! This revised edition covers important new features such as Java 9s JShell and the new modularity features enabling you to separate code into independent modules that perform discrete tasks. Also covered are the new garbage collection algorithm and completely revamped process API. Enhanced JSON coverage is provided as well as a new chapter on JavaServer Faces development for web applications. What Youll Learn Develop Java SE applications using the latest in Java SE technology Exploit advanced features like modularity and lambdas Use JShell to quickly develop solutions Build dynamic web applications with JavaScript and Project Nashorn Create great-looking web interfaces with JavaServer Faces Generate graphics and work with media such as sound and video Add internationalization support to your Java applications Who This Book Is For Both beginning Java programmers and advanced Java developers

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Josh Juneau 2017

Josh Juneau Java 9 Recipes 10.1007/978-1-4842-1976-8_1

1. Getting Started with Java 9

Josh Juneau 1

(1)

Hinckley, Illinois, USA

In this chapter we present a handful of recipes to help programmers who are new to the Java language, as well as those having experience in other languages, become accustomed to Java 9. You will learn to install Java, and also install an Integrated Development Environment (IDE) from which youll develop applications and experiment with the solutions provided in this book. You will learn basics of Java such as how to create a class and how to accept keyboard input. Documentation is often overlooked, but in this chapter you will quickly learn how to create great documentation for your Java code.

Note

Java 9 Recipes is not intended as a complete tutorial. Rather, it covers key concepts of the Java language. If you are truly new to Java, we recommend buying and reading one of the many Beginning Java books that are also published by Apress.

1-1. Creating a Development Environment

Problem

You want to install Java and experiment with the language. Youd also like a reasonable IDE to use with it.

Solution

Install Java Development Kit 9 (JDK. That gives you the language and a compiler. Then install the NetBeans IDE to provide a more productive working environment.

Java Standard Edition (Java SE) is sufficient for most recipes in this book. To download the release, visit the following page on the Oracle Technology Network (OTN) :

http://www.oracle.com/technetwork/java/javase/overview/index.html

Figure shows the Downloads tab, and you can see the Java Platform download link and image prominently on the page. Next to that link is an image for the NetBeans IDE, which provides the option of downloading the JDK and NetBeans together. Choose the option that you prefer, download the release for your platform, and run the setup wizard to install. For the purposes of this book, I am using NetBeans IDE 8.2.

Figure 1-1.

Java SE Downloads page on the OTN

Note

If you chose to only install the Java Platform (JDK) and not NetBeans, you can download NetBeans at a later time by visiting netbeans.org .

How It Works

The name Java is a trademark owned by Oracle Corporation. The language itself is open source, and its evolution is controlled by a process known as the Java Community Process (JCP) . You can read more about that process at www.jcp.org .

While the language is not owned per se by Oracle Corporation, its core development tends to be steered by that company. It is Oracle Corporation that runs the JCP, and that owns the jcp.org domain.

There are many editions of Java , such as the Mobile Edition (ME) and the Enterprise Edition (EE). Java SE is the Standard Edition and represents the heart of the language. Weve built the recipes in this book for Java SE programmers. Those interested in the development of embedded applications for devices such as Raspberry Pi may be interested in learning more about Java ME. Similarly, those interested in developing web applications and working with enterprise solutions may be interested in learning more about Java EE.

Note

Enterprise developers may want to buy and read a copy of Java EE 7 Recipes by Josh Juneau (Apress, 2013).

There are several good websites that you can visit to learn more about Java and keep up to date with the latest on the platform. A good place to begin for all things Java is the following page on the OTN:

http://www.oracle.com/technetwork/java/index.html

The wealth of resources available from this page can be overwhelming at first, but its worth your time to look around and get passingly familiar with the many links that are available.

One of the links will be to Java SE, which takes you to the page shown earlier in Figure . It is from there that you can download Java SE and the NetBeans IDE. Also from there you have access to the official documentation, to community resources such as forums and newsletters, and to training resources designed to help you build knowledge in Java and become certified in the language.

1-2. Getting to Hello, World

Problem

Youve installed Java SE 9 and the NetBeans IDE. Now you want to run a simple Java program to verify that your installation is working properly.

Solution

Begin by opening the NetBeans IDE. You should see a workspace resembling the one in Figure . You may see some projects in the left-hand pane if youve already been working on projects within the IDE.

Figure 1-2.

Opening the NetBeans IDE

Go to the File menu and select New Project. Youll see the dialog in Figure .

Figure 1-3.

Creating a new Java SE project

Figure 1-4.

Naming the project

Give your project a name. For the project related to this book, use the name Java9Recipes . Enter the project name into the Project Name text box at the top of the dialog in Figure .

Then specify the name of your main class in the Create Main Class text box. Give the following name:

org.java9recipes.chapter01.recipe1_02.HelloWorld

Be sure to that youve entered the project name and class name just as we provide them here, because the code to follow depends upon your doing so. Make sure the Project Name text box specifies Java9Recipes . Make sure the Create Main Class text box specifies org.java9recipes.chapter01.recipe1_02.HelloWorld .

Tip

Pay attention to case; Java is case-sensitive.

Press Finish to complete the wizard and create a skeleton project. You should now be looking at a Java source file. Skeleton code is generated for you, and your NetBeans IDE window should resemble the one in Figure .

Figure 1-5.

Viewing the skeleton code generated by NetBeans

Place your cursor anywhere in the source code pane. Press Ctrl-A to select all the skeleton code. Then press Delete to get rid of it. Replace the deleted code with that from Listing .

You can find the code in Listing as part of our example download for the book. There are two files named HelloMessage.java and HelloWorld.java, which reside in a Java package named org.java9recipes.chapter01.recipe1_02 . Note that all recipe solutions of substance throughout this book are in that example download.

The first class, HelloMessage, is a container class that is used to hold a String-based message.

package org.java9recipes.chapter01.recipe1_02;

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