Summary

In this chapter, we started our journey toward object-oriented programming with Java 9. We learned how to launch and work with the new utility introduced with Java 9 that allows us to easily run Java 9 code snippets and print its results: JShell.

We learned the necessary steps to install JDK 9 and we understood the benefits of working with a REPL. We learned to use JShell to run Java 9 code and evaluate expressions. We also learned many of its useful commands and features. We will use them in the forthcoming chapters when we will start working with object-oriented code.

Now that we have learned to work with JShell, we will learn how to recognize real-world elements and translate them into the different components of the object-oriented paradigm supported in Java 9, which is what we are going to discuss in the next chapter.