Conventions 

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "When using a data class, you get a copy method out of the box."

A block of code is set as follows:

    public class Sensor { 
      private final String id; 
      private final double value; 
      public Sensor(String id, double value) { 
        this.id = id;
        this.value = value; 
      }

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 class Sensor { 
      private final String id; 
      private final double value; 
      public Sensor(String id, double value) { 
        this.id = id;
        this.value = value; 
      }

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

$ sdk install gradle 3.0

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "In IntelliJ, choose Code | Generate."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.