Sams Teach Yourself Java in 21 Days (Covers Java 11/12)

by Rogers Cadenhead

Overview

In arenas ranging from enterprise development to Android app programming, Java remains one of the world's most popular programming languages. Sams Teach Yourself Java in 21 Days helps the serious learner gain true mastery over the new Java 9.

In this book's straightforward, step-by-step approach, each lesson builds on everything that's come before, helping readers learn Java's core features and techniques from the ground up. Friendly, accessible, and conversational, this book offers a practical grounding in the language, without ever becoming overwhelming or intimidating.

Week 1 introduces the basic building blocks of the Java programming language: keywords, operators, class and object definitions, packages, interfaces, exceptions, and threads.

Week 2 covers the Swing graphical user interface class libraries and the important classes that support data structures, string handling, dates and times.

Week 3 ventures into the hottest areas of Java programming: web services, Java servlets, network programming, database programming and Android development.

Product Details

ISBN-13:	9780672337956
Publisher:	Pearson Education
Publication date:	01/15/2020
Series:	Sams Teach Yourself
Edition description:	8th ed.
Pages:	672
Product dimensions:	7.00(w) x 9.10(h) x 1.50(d)

About the Author

Rogers Cadenhead is an experienced software developer who has written more than 30 books on programming and web publishing, including Sams Teach Yourself Java in 24 Hours and Absolute Beginner’s Guide to Minecraft Mods Programming. He creates applications on the ServiceNow cloud platform, using Java and JavaScript. He maintains this book’s official website, at www.java21days.com, and can be contacted on Twitter at @rcade and on his weblog, at http://workbench.cadenhead.org.

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
How This Book Is Organized ....................................................................................................2
Who Should Read This Book ...................................................................................................4
Conventions Used in This Book ...............................................................................................5
PART I The Java Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
LESSON 1: Getting Started with Java 9
The Java Language ..................................................................................................................10
Object-Oriented Programming ................................................................................................13
Objects and Classes .................................................................................................................14
Attributes and Behavior ..........................................................................................................16
Organizing Classes and Class Behavior ..................................................................................25
Summary .................................................................................................................................32
Q&A ........................................................................................................................................33
Quiz .........................................................................................................................................34
Certification Practice ...............................................................................................................35
Exercises ..................................................................................................................................35
LESSON 2: The ABCs of Programming 37
Statements and Expressions ....................................................................................................38
Variables and Data Types ........................................................................................................38
Comments................................................................................................................................46
Literals .....................................................................................................................................47
String Literals ...............................................................................................................50
Expressions and Operators ......................................................................................................51
String Arithmetic .....................................................................................................................60
Summary .................................................................................................................................62
Q&A ........................................................................................................................................62
Quiz .........................................................................................................................................63
Certification Practice ...............................................................................................................64
Exercises ..................................................................................................................................65
LESSON 3: Working with Objects 67
Creating New Objects .............................................................................................................68
Using Class and Instance Variables ........................................................................................72
Calling Methods ......................................................................................................................75
Class Methods ..............................................................................................................79
References to Objects ..............................................................................................................80
Casting Objects and Primitive Types ......................................................................................82
Converting Primitive Types to Objects and Vice Versa ................................................85
Comparing Object Values and Classes ....................................................................................87
Summary .................................................................................................................................89
Q&A ........................................................................................................................................90
Quiz .........................................................................................................................................91
Certification Practice ...............................................................................................................91
Exercises ..................................................................................................................................92
LESSON 4: Lists, Logic, and Loops 93
Arrays ......................................................................................................................................94
Block Statements ...................................................................................................................101
if Conditionals .....................................................................................................................102
Switch Conditionals ..............................................................................................................103
The Ternary Operator ............................................................................................................110
for Loops ..............................................................................................................................111
while and do Loops ..............................................................................................................114
xii Sams Teach Yourself Java in 21 Days
Breaking Out of Loops ..........................................................................................................117
Summary ...............................................................................................................................119
Q&A ......................................................................................................................................119
Quiz .......................................................................................................................................120
Certification Practice .............................................................................................................121
Exercises ................................................................................................................................122
LESSON 5: Creating Classes and Methods 123
Defining Classes ....................................................................................................................124
Creating Instance and Class Variables ..................................................................................124
Creating Methods ..................................................................................................................126
Creating Java Applications ....................................................................................................133
Java Applications and Arguments .........................................................................................134
Creating Methods with the Same Name ...............................................................................137
Constructors ..........................................................................................................................142
Overriding Methods ..............................................................................................................146
Summary ...............................................................................................................................150
Q&A ......................................................................................................................................151
Quiz .......................................................................................................................................152
Certification Practice .............................................................................................................153
Exercises ................................................................................................................................154
LESSON 6: Packages, Interfaces, and Other Class Features 155
Modifiers ...............................................................................................................................156
Static Variables and Methods ................................................................................................162
Final Classes, Methods, and Variables ..................................................................................165
Abstract Classes and Methods ..............................................................................................167
Packages ................................................................................................................................167
Creating Your Own Packages ................................................................................................171
Interfaces ...............................................................................................................................174
Creating and Extending Interfaces ........................................................................................177
Summary ...............................................................................................................................185
Q&A ......................................................................................................................................186
Quiz .......................................................................................................................................186
Certification Practice .............................................................................................................187
Exercises ................................................................................................................................188
LESSON 7: Exceptions and Threads 189
Exceptions .............................................................................................................................190
Managing Exceptions ............................................................................................................193
Declaring Methods That Might Throw Exceptions ..............................................................200
Creating and Throwing Exceptions .......................................................................................205
When Not to Use Exceptions ................................................................................................208
Threads ..................................................................................................................................209
Summary ...............................................................................................................................216
Q&A ......................................................................................................................................217
Quiz .......................................................................................................................................217
Certification Practice .............................................................................................................218
Exercises ................................................................................................................................219
PART II: The Java Class Library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221
LESSON 8: Data Structures 223
Moving Beyond Arrays .........................................................................................................224
Java Structures .......................................................................................................................224
Generics .................................................................................................................................244
Enumerations .........................................................................................................................247
Summary ...............................................................................................................................249
Q&A ......................................................................................................................................249
Quiz .......................................................................................................................................250
Certification Practice .............................................................................................................251
Exercises ................................................................................................................................252
LESSON 9: Creating a Graphical User Interface 253
Creating an Application ........................................................................................................254
Working with Components ...................................................................................................261
Lists .......................................................................................................................................274
The Java Class Library ..........................................................................................................276
Summary ...............................................................................................................................278
Q&A ......................................................................................................................................279
Quiz .......................................................................................................................................279
Certification Practice .............................................................................................................280
Exercises ................................................................................................................................281
LESSON 10: Building an Interface 283
Swing Features ......................................................................................................................284
Summary ...............................................................................................................................304
Q&A ......................................................................................................................................304
Quiz .......................................................................................................................................305
Certification Practice .............................................................................................................306
Exercises ................................................................................................................................307
LESSON 11: Arranging Components on a User Interface 309
Basic Interface Layout ..........................................................................................................310
Mixing Layout Managers ......................................................................................................320
Card Layout ...........................................................................................................................321
Summary ...............................................................................................................................329
Q&A ......................................................................................................................................330
Quiz .......................................................................................................................................331
Certification Practice .............................................................................................................331
Exercises ................................................................................................................................332
LESSON 12: Responding to User Input 333
Event Listeners ......................................................................................................................334
Working with Methods ..........................................................................................................339
Using Inner Classes ....................................................................................................353
Summary ...............................................................................................................................355
Q&A ......................................................................................................................................355
Quiz .......................................................................................................................................356
Certification Practice .............................................................................................................357
Exercises ................................................................................................................................358
LESSON 13: Creating Java2D Graphics 359
The Graphics2D Class ..........................................................................................................360
Drawing Text .........................................................................................................................362
Color ......................................................................................................................................366
Drawing Lines and Polygons ................................................................................................369
Summary ...............................................................................................................................378
Q&A ......................................................................................................................................379
Quiz .......................................................................................................................................379
Certification Practice .............................................................................................................380
Exercises ................................................................................................................................381
LESSON 14: Developing Swing Applications 383
Improving Performance with SwingWorker .........................................................................384
Grid Bag Layout ....................................................................................................................389
Summary ...............................................................................................................................398
Q&A ......................................................................................................................................398
Quiz .......................................................................................................................................398
Certification Practice .............................................................................................................399
Exercises ................................................................................................................................400
PART III: Java Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401
LESSON 15: Using Inner Classes and Lambda Expressions 403
Inner Classes .........................................................................................................................404
Lambda Expressions .............................................................................................................413
Variable Type Inference ........................................................................................................418
Summary ...............................................................................................................................419
Q&A ......................................................................................................................................420
Quiz .......................................................................................................................................420
Certification Practice .............................................................................................................421
Exercises ................................................................................................................................422
LESSON 16: Working with Input and Output 423
Introduction to Streams .........................................................................................................424
Byte Streams .........................................................................................................................426
Filtering a Stream ..................................................................................................................431
Character Streams .................................................................................................................440
Files and Paths.......................................................................................................................445
Summary ...............................................................................................................................447
Q&A ......................................................................................................................................448
Quiz .......................................................................................................................................448
Certification Practice .............................................................................................................449
Exercises ................................................................................................................................450
LESSON 17: Communicating Over HTTP 451
Networking in Java ................................................................................................................452
The java.nio Package .........................................................................................................465
Summary ...............................................................................................................................480
Q&A ......................................................................................................................................480
Quiz .......................................................................................................................................481
Certification Practice .............................................................................................................482
Exercises ................................................................................................................................482
LESSON 18: Accessing Databases with JDBC and Derby 483
Java Database Connectivity...................................................................................................484
Summary ...............................................................................................................................501
Q&A ......................................................................................................................................502
Quiz .......................................................................................................................................502
Certification Practice .............................................................................................................503
Exercises ................................................................................................................................503
LESSON 19: Reading and Writing RSS Feeds 505
Using XML ...........................................................................................................................506
Designing an XML Dialect ...................................................................................................508
Processing XML with Java ...................................................................................................510
Processing XML with XOM .................................................................................................510
Summary ...............................................................................................................................525
Q&A ......................................................................................................................................525
Quiz .......................................................................................................................................526
Certification Practice .............................................................................................................527
Exercises ................................................................................................................................528
LESSON 20: Making Web Service Requests 529
Introduction to XML-RPC ....................................................................................................530
Communicating with XML-RPC ..........................................................................................531
Choosing an XML-RPC Implementation .............................................................................534
Using an XML-RPC Web Service ........................................................................................536
Creating an XML-RPC Web Service ....................................................................................539
Summary ...............................................................................................................................545
Q&A ......................................................................................................................................545
Quiz .......................................................................................................................................546
Certification Practice .............................................................................................................546
Exercises ................................................................................................................................547
LESSON 21: Writing a Game with Java 549
Playing a Game .....................................................................................................................550
Summary ...............................................................................................................................572
Q&A ......................................................................................................................................572
Quiz .......................................................................................................................................573
Certification Practice .............................................................................................................574
Exercises ................................................................................................................................575
APPENDIXES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 597
APPENDIX A: Using the NetBeans Integrated Development Environment . . . . . . 599
APPENDIX B: Fixing Package Not Visible Errors in NetBeans . . . . . . . . . . . . . . . . 609
APPENDIX C: This Book’s Website. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 613
APPENDIX D: Using the Java Development Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . 615
APPENDIX E: Programming with the Java Development Kit . . . . . . . . . . . . . . . . . 631
9780672337956, TOC, 11/18/2019