Ron Dai

Learn Java with Math

Using Fun Projects and Games

Ron Dai
Seattle, WA, USA
ISBN 978-1-4842-5208-6e-ISBN 978-1-4842-5209-3
https://doi.org/10.1007/978-1-4842-5209-3
© Ron Dai 2019
This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed.
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While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.
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To Angela, Henry, and Hanson, who always brighten my world

Preface

Congratulations on finding out about this book. I am writing this book to help beginners learn Java programming effectively and with plenty of fun. The book is designed to simplify the complexity and guide the learner to explore and discover things under the hood. I hope the instructions inside this book are intuitive enough for beginners to follow through with hands-on practice.

Having a good foundation of math skills is undoubtedly super powerful when learning programming. In the meantime, it is a good opportunity to practice mathematical problem solving when you study programming. With this motivation, I have included some math practice problems applicable to programming-related concepts.

The more practice you do, the more effectively you will be able to produce results. It requires intensive and extensive problem solving exercises for anyone to master coding skills. In this book, I have included quite a few interesting coding problems for practice. I hope you will have an enjoyable learning experience. Source Code for this book is accessible via the Download Source Code button located at www.apress.com/9781484252086 .

Acknowledgments

I am grateful for my wife, Angela, who has always been supportive of my technical research and teaching work in so many ways. I am also thankful to my two lovely and intelligent sons, Henry and Hanson, who have provided me firsthand feedback and inspired me when I created the idea of this book. I can never forget about what I have learned from Mr. Bangfu Mo and Mr. Jim Pierson, who have provided me with guidance on how to elaborate the creative ideas in a book. I also want to take this opportunity to send my sincere gratitude for their invaluable advice that they have given me in the past. My special thanks go to everyone on the Apress editorial team, who are all world-class professionals.

../images/485723_1_En_BookFrontmatter_Figb_HTML.jpg  (Designed by Hanson Dai)

Table of Contents

Part I: Java Basic1
Chapter 1:​ Introduction 3
Problems 7
Chapter 2:​ Number Basics 9
What Is a Numeral System?​ 9
Why Do People Use Decimal Numbers, While Computers Use Binary Numbers?​ 10
How to Convert a Number Between Different Numeral Systems 11
What Is Bit, Byte, KB, MB, GB, TB, and PB?​ 17
What Is Bitwise?​ 17
Problems 18
Chapter 3:​ Java Basics 19
What Features Does Java Have?​ 19
Object-Oriented 19
Class-Based 20
Java Bytecode 20
Chapter 4:​ Start Playing with Java 23
What Is the Difference Between the JRE and the JDK?​ 24
What Are a Workspace, Source, and Package?​ 25
What Are Edit, Compile, and Execute?​ 25
Creating Your First Program 26
Exploring Class and main( ) 29
Why Is It “public static void main(String[ ] args)”?​ 30
Problems 31
Chapter 5:​ Variables 33
Defining a Variable Name 34
Example 34
Different Types of Variables in Java 35
Assigning a Value to a Variable 37
Lab Work 37
Chapter 6:​ First Algorithm 39
Swapping Values Between Variables 40
Other Approaches 41
Chapter 7:​ Input and Output 43
Importing java.​util.​Scanner 43
Getting Input 44
Producing Output 44
Lab Work 45
Example 45
Example 46
Lab Work 46
Problems 47
Chapter 8:​ Loop Structure – for Loop 49
Example 49
Lab Work 50
The for Loop Formula 50
Finding the “for Loop” Formula for an Arithmetic Sequence 51
Math:​ Counting Strategically 51
Lab Work 53
Example 53
Lab Work 54
Problems 54
Chapter 9:​ Loop Structure – while Loop 57
Example 58
Example 58
The do-while Loop 60
Lab Work 60
Problems 61
Chapter 10:​ Logical Control Structures 63
Conditional Operators 64
Lab Work 66
Logical Operators 67
Math:​ Logical Operators 67
Math:​ Analyzing Logical Problems 69
Lab Work 69
Problems 70
Chapter 11:​ Errors and Tips 73
Programming Tips 75
Handling Exceptions 76
Problems 77
Chapter 12:​ Java Basics Summary 79
General Rules 79
How to Define a Variable Name 79
How to Output in Console 79
How to Listen to Input in Console 80
How to Repeat an Operation 80
How to Control a Conditional Operation 80
Basic Coding Structure 81
Curly Braces 82
Lab Work 82
Chapter 13:​ Java Basics Projects 85
Chapter 14:​ Java Basics Solutions 89
Part II: Java Intermediate91
Chapter 15:​ Wright Brothers’ Coin Flip Game 93
Chapter 16:​ Pythagorean Triples 97
Math:​ Pythagorean Triples 97
Problems 101
Math:​ Pythagorean Primes 101
Chapter 17:​ Strong Typed Programming 103
Type Casting 103
Math:​ Slope of a Line 105
Math:​ Collinearity 107
Chapter 18:​ Conditional Statements 109
Math:​ Hypothesis and Conclusion 109
Math:​ Quadrants 114
Problems 116
Chapter 19:​ Switch Statement 119
Problem 125
Chapter 20:​ Tracing Moving Objects 127
Math:​ Bouncing Ball 127
Chapter 21:​ Counting 131
Problems 146
Chapter 22:​ Factorization 147
Math:​ Finding Factors 147
Math:​ Halving the Problem 149
Math:​ Using the Square Root 150
Chapter 23:​ Exploratory Experimentation of Pi 155
Math:​ Calculating a Population 155
Example 156
Math:​ Pi from Probability Theory 156
Problem 161
Chapter 24:​ Classes in Object-Oriented Programming 163
Lab Work 166
Lab Work 166
Lab Work 167
Problems 167
Chapter 25:​ Interface – Total Abstraction 171
Chapter 26:​ Inheritance – Code Reuse 177
Problems 179
Chapter 27:​ Encapsulation and Polymorphism 181
Encapsulation 181
Polymorphism 183
Problems 183
Chapter 28:​ Array – a Simple and Efficient Data Structure 185
Lab Work 187
Problems 187
Chapter 29:​ Common Pitfalls 189
Lab Work 189
Chapter 30:​ Design Considerations 193
Practical Case 1 193
Practical Case 2 195
Practical Case 3 197
Approach A 197
Approach B 198
Practical Case 4 198
Chapter 31:​ IOU Computation 203
Chapter 32:​ Projects 211
Project A 211
Step 1 211
Step 2 212
Project B 213
Project C 213
Project D 214
Project E 214
Project F 214
Project G 215
Chapter 33:​ Java Intermediate Solutions 217
For 16.​ Pythagorean Triples 217
For 17.​ Strong Typed Programming 217
For 18.​ Conditional Statements 218
For 19.​ Switch Statement 219
For 21.​ Counting 220
For 23.​ Exploratory Experimentation of Pi 221
For 24.​ Classes in Object-Oriented Programming 221
For 26.​ Inheritance – Code Reuse 221
For 27.​ Encapsulation and Polymorphism 222
For 28.​ Array – a Simple and Efficient Data Structure 223
For 29.​ Common Pitfalls 223
Index 227

About the Author and About the Technical Reviewer

About the Author

Ron Dai
../images/485723_1_En_BookFrontmatter_Figc_HTML.jpg

is a software engineer and data scientist at Microsoft. He is also a mathematics and computer science instructor at NWCS (Northwest Chinese School, http://www.nwchinese.org ) located in Bellevue, Washington. He enjoys teaching computer science using math. He has written a book titledCool Math – Scenarios and Strategies, which is available on amazon.com.

 

About the Technical Reviewer

Jeff Friesen
../images/485723_1_En_BookFrontmatter_Figd_HTML.jpg
is a freelance teacher and software developer with an emphasis on Java. In addition to authoringJava I/O, NIO and NIO.2 (Apress, 2015),Java Threads and the Concurrency Utilities (Apress, 2015), and the first edition of this book, Jeff has written numerous articles on Java and other technologies (such as Android) for JavaWorld (JavaWorld.com), informIT (InformIT.com), Java.net, SitePoint (SitePoint.com), and other web sites. Jeff can be contacted via his web site at JavaJeff.ca or via his LinkedIn (LinkedIn.com) profile ( www.linkedin.com/in/javajeff ).
 
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