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Creating Hot Web Sites with Java Applets

Arthur van Hoff, Sami Shaio, and Orca Starbuck , Inc.

Technische Hochschule Darmstadt FACHBEREICH INFORMATIK B1BL1OTHEK

Inventar-Nr.: h.%.T...Q.Q.X.iA Sachgebieta: Standort:

Fachbereichsbibliothek Informatik TU Darmstadt A •T 8 Addison-Wesley Publishing Company Reading, Massachusetts • Menlo Park, California • New York Don Mills, Ontario • Wokingham, England • Amsterdam Bonn • Sydney • Singapore • Tokyo • Madrid • San Juan Paris • Seoul • Milan • Mexico City • Taipei t

Contents

List of Figures ix Acknowledgments xiii Introduction xv

1. Introducing Java and Java Applets 1 What IS Java? 1 Plug-n-Play Applets 3 You and Java 4

2. Java and the Internet 5 Java History 5 The Java Programming Language 10 Java and the Internet 16 The Future of Java 18

3. Applets Explained 21 Java Applets 21 Adding an Applet to your Home Page 26 Tools 29 Applets Basics 35 vi CONTENTS

4. Cool Applets 41 Overview 41 Sample Applet Description 44 Legend 45 Abacus 46 Animator 47 Audioltem 49 Ballistic Simulator 50 Bar Chart 51 Bar Graph 53 Blinking Text 56 Bouncing Heads 57 Clock 58 Crossword Puzzle 59 Dining Philosophers 60 Escher Paint 61 Graph Layout 62 ImageLoop 64 ImageMap 65 LED Sign 68 Line Graph 70 Link Button 72 Molecule Viewer 73 Neon Sign 75 Nervous Text 76 Nuclear Powerplant 77 Pythagoras' Theorem 78 Scrolling Images 79 Spreadsheet 81 Tic-Tac-Toe 82 TumblingDuke 83 Under Construction 84 Voltage Circuit Simulator 85 What's New! 86 Wire Frame Viewer 87 Zine 89

5. Java in Depth 93 Hello World 93 Overview of 94 Objects and Classes 101 Class Inheritance 105 Interfaces 109 CONTENTS vii

Packages 110 Exceptions 111 Threads 114 Monitors and Synchronization 116 Programming with Java 120

6. Building an Applet 121 The Applet Class 121 The Abstract Window Toolkit 127 Simple Graphics 133 Drawing Strings 136 Drawing Images 137 Making your Applet Configurable 138 Adding UI Controls 144 Animation 148 Future Project Ideas 153

Appendix A. Applet Guide 155 Appendix B. Places to Go 157 Appendix C. Source Code 159 Appendix D. javac 165 Appendix E. Java 169 Appendix F. Appletviewer 173 Appendix G. Applet Tag Definition 175 Index 177