Book Image

Learning Java by Building Android Games - Third Edition

By : John Horton
5 (1)
Book Image

Learning Java by Building Android Games - Third Edition

5 (1)
By: John Horton

Overview of this book

Android is one of the most popular mobile operating systems today. It uses the most popular programming language, Java, as one of the primary languages for building apps of all types. Unlike most other Android books, this book doesn’t assume that you have any prior knowledge of Java programming, instead helps you get started with building Android games as a beginner. This new, improved, and updated third edition of Learning Java by Building Android Games helps you to build Android games from scratch. Once you've got to grips with the fundamentals, the difficulty level increases steadily as you explore key Java topics, such as variables, loops, methods, object-oriented programming (OOP), and design patterns while working with up-to-date code and supporting examples. At each stage, you'll be able to test your understanding by implementing the concepts that you’ve learned to develop a game. Toward the end, you’ll build games such as Sub Hunter, Retro Pong, Bullet Hell, Classic Snake, and Scrolling Shooter. By the end of this Java book, you'll not only have a solid understanding of Java and Android basics but will also have developed five cool games for the Android platform.
Table of Contents (24 chapters)

Chapter 3: Variables, Operators, and Expressions

We are going to make good progress in this chapter. We will learn about Java variables that allow us to give our game the data it needs. By doing this, things such as the sub's location and whether it has been hit will soon be possible to code. Furthermore, we will look at the use of operators and expressions, which will enable us to change and mathematically manipulate this data as the game is executing.

In this chapter, we will cover the following topics:

  • Handling syntax and jargon
  • Having a full discussion about Java variables, including types, references, primitives, declaration, initialization, casting, concatenation, and more
  • Practicing writing code to use and manipulate variables with operators and expressions
  • Learning about the Android screen coordinate system for drawing text and graphics to the screen
  • Using what we have learned to add variables to the Sub' Hunter game
  • Learning how to...