Book Image

Introduction to Programming

By : Nick Samoylov
Book Image

Introduction to Programming

By: Nick Samoylov

Overview of this book

Have you ever thought about making your computer do what you want it to do? Do you want to learn to program, but just don't know where to start? Instead of guiding you in the right direction, have other learning resources got you confused with over-explanations? Don't worry. Look no further. Introduction to Programming is here to help. Written by an industry expert who understands the challenges faced by those from a non-programming background, this book takes a gentle, hand-holding approach to introducing you to the world of programming. Beginning with an introduction to what programming is, you'll go on to learn about languages, their syntax, and development environments. With plenty of examples for you to code alongside reading, the book's practical approach will help you to grasp everything it has to offer. More importantly, you'll understand several aspects of application development. As a result, you'll have your very own application running by the end of the book. To help you comprehensively understand Java programming, there are exercises at the end of each chapter to keep things interesting and encourage you to add your own personal touch to the code and, ultimately, your application.
Table of Contents (21 chapters)

Writing an application code

This is the most interesting activity of a programmer's profession. And that is the purpose of this book to help you write Java code well.

Let's start with the requirements for your first application. It should take an integer number as an input, multiply it by 2, and print the result in the following format: <the input number> * 2 = <result>.

Now, let's come up with the design. We will create the SimpleMath class with the multiplyByTwo(int i) method that will accept an integer and return the result. This method will be called by the main() method of the MyApplication class. The main() method should:

  • Receive an input number from a user
  • Pass the input value into the multiplyByTwo(int i) method
  • Get back the result
  • Print it on a screen in the required format

We will also create tests for the multiplyByTwo(int i) method...