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

Description

Covers new features in Java 11 and 12. The book’s examples have been extensively refreshed and updated, with more visual examples and diagrams. This edition of the book continues to use the NetBeans IDE, which has proven to be helpful for readers who don’t want to master a command-line environment just to develop Java programs.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.
    

• Updated to cover Java 11 and 12 features 
• Designed for the serious learner who wants to thoroughly learn the fundamentals of Java programming
• Acclaimed for its clear and personable writing, for its high-quality examples, and for its logical and complete organization

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

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.

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 Java.

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.

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