Job Ready Java

Lesson 1Installing 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.

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

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 ...