Introduction

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In Chapter 3 you will learn about:

• Java Program Structure
• Variables
• Conversions
• Displaying Data
• Formatting Numbers
• Java Program Structure

In the last chapter we created a simple Java application. This program did no more than display Hello World. Yet you were probably wondering what was behind up the Java source code that you entered to create the program. In the next section you will be introduced to what makes up a Java source code file.