In this book, you will find a number of styles of text 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: "We can include other contexts through the use of the include directive."

A block of code is set as follows:

import java.util.*;
public class ListFilteringSample {
    public static void main(String[] args) {
        List<Integer> elements = Arrays.asList(1, 2, 3, 4, 5);
        List<Integer> filteredElements = new ArrayList<Integer>();
        for (Integer element : elements)
            if (element < 4) filteredElements.add(element);
        System.out.println("filteredElements:" + filteredElements);
    }
}

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

import java.util.*;
public class ListFilteringSample {
    public static void main(String[] args) {
        List<Integer> elements = Arrays.asList(1, 2, 3, 4, 5);
        List<Integer> filteredElements = new ArrayList<Integer>();
        for (Integer element : elements)
            if (element < 4) filteredElements.add(element);
        System.out.println("filteredElements:" + filteredElements);
    }
}

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

> ./activator ui 

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "Out of curiosity, you may click on the Code view & Open in IDE tab and then on the Run tab."