Job Ready Java

Haythem Balti, Alan Galloway

• Publisher: Wiley
• Year: 2021
• ISBN:
  9781119775652
• Edition: 1
• Topic: Computer Science
• Subtopic: Programming in Java
• Index: Computer Science

Prepare yourself to take on new and exciting Java programming challenges with this one-stop resource

Job Ready Java delivers a comprehensive and foundational approach to Java that is immediately applicable to real-world environments. Based on thehighly regarded and effectiveSoftware Guild Java Bootcamp: Object Oriented Programming course, this book teaches youthebasic and advanced Java concepts you will need at any entry-level Java position.

With the "Pulling It Together" sections, you'll combine and integrate the concepts and lessons taught by the book, while also benefiting from:

• A thorough introductionto getting set up with Java, including how towrite, compile, and run Java programs withor withoutaJava IDE
• Practical discussions of the basics oftheJavalanguage, including syntax, program flow, and code organization
• A walkthrough the fundamentals of Object-Oriented Programming including Classes, Objects, Interfaces, and Inheritance, and how to leverage OOPin Javato create elegant code.
• Explorations of intermediate and advanced Java concepts, includingMaven, unit testing, Lambdas, Streams, and the Spring Framework

Perfect for Java novices seeking to make a career transition, Job Ready Java will also earn a place in the libraries of Java developers wanting to brush up on the fundamentals of their craft with an accessible and up-to-date resource.

PART I
Getting Set Up

• Lesson 1: Installing Java
• Lesson 2: Installing a Development Environment: NetBeans
• Lesson 3: Using an Integrated Development Environment

Lesson 1
Installing Java

Welcome to the world of learning Java. In this first lesson, we will set up everything needed to write Java programs. We will then write our first program together called “Hello, World!”

It is important to know that, by itself, Java code doesn't do anything. It is just text. To make it useful, we need to install the Java Development Kit (JDK). The JDK contains the compiler and other tools needed to create executable Java programs. After the JDK is installed, we will check the configuration by creating, compiling, and running the obligatory “Hello, World!” program.

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LEARNING OBJECTIVES

By the end of this lesson, you will be able to:

• Differentiate between the JDK and Java custom runtimes
• Compare OpenJDK to Oracle JDK
• Install a JDK and verify the installation
• Trace the steps to create a “Hello, World!” program using a text editor
• Define syntax as it relates to development
• Explain the pieces of the compiler
• Trace the development of a program through the various parts of compilation and execution of a program

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THE JAVA UNIVERSE

Before we get into downloading and installing the Java tools and writing our first program, let's first take a look at the bigger picture: the Java universe, if you will. A little history will help to make sense of where Java is today.

The development of the Java language was led by James Gosling at Sun Microsystems. The initial development started in the early 1990s, and the language was originally called Oak. The first official release of Java was in 1996. Now, in Internet time, 1996 seems like, I don't know, a million years ago. And it seems that Java has this reputation for being an old and creaky language because there are all these newer and cooler languages out there—you know, like Ruby and Python and JavaScript.

But wait—the first version of Ruby was also released in 1995 and the first version of Python was started in 1989, so they aren't really newer languages. JavaScript was called LiveScript when it came on to the scene in 1995. Maybe Java isn't an old language after all.

Java was originally a closed source project, meaning that developers had to purchase a license to use it, and the code that runs Java was accessible only to Sun Microsystems developers. In 2006, however, Sun decided to make the project open source under a newly defined General Public License (GPL). In short, Sun decided to let any developer use Java to write software programs for any purpose at no cost. In addition, the GPL allows developers to access the code that runs Java to tweak it for their own purposes.

In 2010, Oracle bought Sun Microsystems and took over stewardship of Java. Oracle continues to maintain, distribute, and support Java and its related tools, including the JDK and the JVM.

The Java Development Kit

The Java Development Kit is a software package that contains tools that allow developers, like you, to write new Java programs. The...