Creational Design Patterns in Java: Designing Flexible, Scalable, and Reliable Software

Apress Pocket Guides....2 Creational Design Patterns in Java....3 Introduction....7 How Is the Book Organized?....9 Prerequisite Knowledge....9 Who This Book Is For....11 Guidelines for Using This Book....11 Useful Software....11 Conventions Used in This Book....12 Final Words....13 Acknowledgments....17 Table of Contents....18 About the Author....21 About the Technical Reviewer....23 1. The Factory Pattern....24 Direct Instantiations....24 Programming Without a Factory....24 Demonstration 1....26 Output....26 Analysis....27 Simple Factory Pattern....28 What Is a Factory?....28 Real-Life Example....28 Computer World Example....28 Demonstration 2....29 Output....31 Analysis....31 Q&A Session....31 Factory Method Pattern....33 Using Multiple Factories....33 Demonstration 3....35 Output....35 Q&A Session....36 Summary....39 2. Singleton Pattern....40 Concept....40 Real-Life Example....41 Computer World Example....41 The First Implementation....41 Using the Synchronized Method....42 Demonstration 1....44 Output....44 Analysis....44 Q&A Session....46 Alternative Implementations....53 Eager Initialization....53 Demonstration 2....53 Output....54 Analysis....55 Q&A Session....56 Bill Pughs Singleton....58 Demonstration 3....58 Output....59 Analysis....59 Enum-Based Singleton....59 Demonstration 4....60 Output....61 Analysis....61 Q&A Session....61 Summary....65 3. Builder Pattern....67 Concept....67 Real-Life Example....68 Computer World Example....69 The First Implementation....69 Explicit Director....69 Demonstration 1....76 Output....77 Q&A Session....78 Alternative Implementations....80 Fluent Builder....80 Demonstration 2....83 Output....84 Analysis....85 Q&A Session....85 Refactoring....88 Demonstration 3....91 Output....92 Analysis....92 Summary....93 4. Prototype Pattern....94 Concept....94 Real-Life Example....94 Computer World Example....94 The First Implementation....96 Key Considerations....96 Demonstration 1....101 Output....102 Analysis....103 Q&A Session....103 Alternative Implementation....108 A Factory-Based Variation....108 Demonstration 2....110 Output....111 Q&A Session....111 Summary....113 5. Dependency Injection Pattern....114 Concept....114 A Sample Program....114 Demonstration 1....116 Output....116 Introducing Dependency Injection....117 Real-Life Example....117 Computer World Example....117 Types of DI....118 Constructor Injection....119 Demonstration 2....119 Output....120 Q&A Session....121 Enhancing the Program....121 Demonstration 3....124 Output....125 Q&A Session....125 Setter Injection....126 Demonstration 4....127 Output....127 Analysis....127 Q&A Session....128 Method Injection....129 Demonstration 5....129 Output....130 Q&A Session....130 Interface Injection....131 Demonstration 6....134 Output....135 Q&A Session....136 Summary....141 Appendix A: Exploring Pattern Enhancements....143 Revisiting Factory Pattern....143 Parameterized Factory....143 Demonstration 1....143 Output....146 Analysis....147 Registry-Based Factory....147 Demonstration 2....147 Output....150 Analysis....150 Simplified Implementation....150 Demonstration 3....150 Final Thoughts....152 Revisiting the Builder Pattern....152 Exercise....152 Key....153 Revisiting the Prototype Pattern....153 Using an External Library (Apache Commons Lang)....154 Demonstration 4....154 Output....158 Appendix B: Whats Next?....161 Books....161 Other Resources....162 Final Note....162 Appendix C: Other Books by the Author....163