To get the most out of this book

While much of the code will work with earlier Java versions, we would recommend installing or upgrading to Java 21 to avoid version-related compiler errors.

If you currently have nothing on your system, the following setup would be great:

• JDK 21 or later (Oracle’s JDK or OpenJDK)
• IntelliJ IDEA (community edition is good enough) or Eclipse or Netbeans

Software/hardware covered in the book	Operating system requirements
Java 21+	Windows, macOS, or Linux

See Chapter 1 for instructions on how to get both Java and an IDE installed on various operating systems.

If you are using the digital version of this book, we advise you to type the code yourself or access the code from the book’s GitHub repository (a link is available in the next section). Doing so will help you avoid any potential errors related to the copying and pasting of code.

Disclaimer

With the intention of the Publisher and Author, certain graphics included in this title are displaying large screen examples where the textual content is not relevant to the graphic example. We encourage our readers to download the digital copy included in their purchase for magnified and accessible content requirements.