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: “ So, the main() method has now handed over control to the simpleExample() method, and control will not return to main() until simpleExample() exits”

A block of code is set as follows:

public class HelloWorld { public static void main(String[] args) { 
System.out.println("Hello world!"); 
} 
} 

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

//        int age = 25;        System.out.println(age);

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

Enter a number (negative number to exit) -->1
Enter a number (negative number to exit) -->
2

Tips or important notes

Appear like this.