Chapter 1. JShell – A Read-Evaluate-Print-Loop for Java 9

In this chapter, we will start our journey toward object-oriented programming with Java 9. You will learn how to launch and work with a new utility introduced with Java 9 that will allow us to easily run Java 9 code snippets and print their results: JShell. This utility will make it easy for you to learn object-oriented programming. We will do the following:

• Get ready for our journey toward OOP (Object-Oriented Programming) with Java 9
• Install the required software on Windows, macOS, or Linux
• Understand the benefits of working with a REPL (Read-Evaluate-Print-Loop) utility
• Check default imports and use auto-complete features
• Run Java 9 code in JShell
• Evaluate expressions
• Work with variables, methods, and sources
• Edit the source code in our favorite external code editor
• Load source code