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

CodeInText: 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: "Every time a new item is published by the observable, the onNext() method is called on each subscriber until the observable finishes its data flow."

A block of code is set as follows:

<!--https://mvnrepository.com/artifact/io.reactivex.rxjava2/rxjava -->
<dependency>
        <groupId>io.reactivex.rxjava2</groupId>
        <artifactId>rxjava</artifactId>
        <version>2.1.14</version>
</dependency>

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

public interface FootballPlayerRepository extends CrudRepository<FootballPlayer, Integer> {

}

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

$ java -listmods

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Click the Generate Project button to download a scaffold of a Maven project."