Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “We begin with a class that implements Runnable. actionCounter is the number we will count down from in the thread.”

A block of code is set as follows:

private final double principal = 100.0;
private final double annualInterestRate = 0.05;
private final double compoundPerTimeUnit = 12.0;
private final double time = 5.0;

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

private final NumberFormat currencyFormat;
private final NumberFormat percentFormat;

Any command-line input or output is written as follows:

brew install openjdk@17

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “When you click on Accept, the code from the JShell editor will be transferred to JShell.”

Tips or important notes

Appear like this.