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Overview
Design Patterns in Java™ gives you the hands-on practice and deep insight you need to fully leverage the significant power of design patterns in any Java software project. The perfect complement to the classic Design Patterns, this learn-by-doing workbook applies the latest Java features and best practices to all of the original 23 patterns identified in that groundbreaking text.
Drawing on their extensive experience as Java instructors and programmers, Steve Metsker and Bill Wake illuminate each pattern with real Java programs, clear UML diagrams, and compelling exercises. You'll move quickly from theory to application–learning how to improve new code and refactor existing code for simplicity, manageability, and performance.
Coverage includes
- Using Adapter to provide consistent interfaces to clients
- Using Facade to simplify the use of reusable toolkits
- Understanding the role of Bridge in Java database connectivity
- The Observer pattern, Model-View-Controller, and GUI behavior
- Java Remote Method Invocation (RMI) and the Proxy pattern
- Streamlining designs using the Chain of Responsibility pattern
- Using patterns to go beyond Java's built-in constructor features
- Implementing Undo capabilities with Memento
- Using the State pattern to manage state more cleanly and simply
- Optimizing existing codebases with extension patterns
- Providing thread-safe iteration with the Iterator pattern
- Using Visitor to define new operations without changing hierarchy classes
If you're a Java programmer wanting to save time while writing better code, this book's techniques, tips, and clear explanations and examples will help you harness the power of patterns to improve every program you write, design, or maintain.
All source code is available for download at http://www.oozinoz.com.
Product Details
| ISBN-13: | 9780321629944 |
|---|---|
| Publisher: | Pearson Education |
| Publication date: | 04/18/2006 |
| Series: | Software Patterns Series |
| Sold by: | Barnes & Noble |
| Format: | eBook |
| Pages: | 480 |
| File size: | 5 MB |
| Age Range: | 18 Years |
About the Author
Steven John Metsker, passed away in 2008 and was a Managing Consultant with Dominion Digital, an information technology and business process reengineering company. Steve specialized in object-oriented techniques for creating clean, powerful software, and he is the author of Building Parsers with Java™, Design Patterns Java™ Workbook, and Design Patterns in C# (all from Addison-Wesley).
William C. Wake, http://www.xp123.com , is an independent software consultant, coach, and trainer with more than twenty years of programming experience. Bill previously held positions with Capital One Financial, DMR Trecom, and VTLS, Inc. He is the author of the Refactoring Workbook and Extreme Programming Explored (both from Addison-Wesley).
Read an Excerpt
Design patterns are class- and method-level solutions to common problems in object-oriented design. If you're an intermediate-level Java programmer who wants to become advanced or an advanced-level Java programmer who hasn't yet studied design patterns, this book is for you.
Design Patterns in Java™ takes a workbook approach. Each chapter focuses on a particular pattern. In addition to explaining the pattern, the chapter includes a number of challenges, each asking you to explain something or to develop code that solves a problem.
We strongly urge you to stop and work through the challenges rather than try to read this book straight through. You'll learn more by putting in the work to do the challenges, even if it's only a chapter or two a week.An Update
This book merges and updates two previous books: Design Patterns Java Workbook™; and Design Patterns in C#. This book combines the Java orientation of the former with the more stand-alone approach of the latter. If you've already worked through the previous books, you won't need this one.
Table of Contents
Preface xiii Chapter 1 Introduction 1Why Patterns? 1
Why Design Patterns? 2
Why Java? 3
UML 4
Challenges 4
The Organization of This Book 5
Welcome to Oozinoz! 6
Summary 7
Part I Interface Patterns 9 Chapter 2 Introducing Interfaces 11Interfaces and Abstract Classes 11
Interfaces and Obligations 13
Summary 15
Beyond Ordinary Interfaces 16
Chapter 3 Adapter 17Adapting to an Interface 17
Class and Object Adapters 21
Adapting Data for a JTable 25
Identifying Adapters 30
Summary 31
Chapter 4 Facade 33Facades, Utilities, and Demos 33
Refactoring to Facade 35
Summary 46
Chapter 5 Composite 47An Ordinary Composite 47
Recursive Behavior in Composites 48
Composites, Trees, and Cycles 50
Composites with Cycles 56
Consequences of Cycles 60
Summary 60
Chapter 6 Bridge 63An Ordinary Abstraction: On the Way to Bridge 63
From Abstraction to Bridge 66
Drivers as Bridges 68
Database Drivers 69
Summary 71
Part II Responsibility Patterns 73 Chapter 7 Introducing Responsibility 75Ordinary Responsibility 75
Controlling Responsibility with Visibility 77
Summary 79
Beyond Ordinary Responsibility 79
Chapter 8 Singleton 81Singleton Mechanics 81
Singletons and Thread 83
Recognizing Singleton 84
Summary 86
Chapter 9 Observer 87A Classic Example: Observer in GUIs 87
Model/View/Controller 92
Maintaining an Observable Object 99
Summary 101
Chapter 10 Mediator 103A Classic Example: GUI Mediators 103
Mediators of Relational Integrity 108
Summary 116
Chapter 11 Proxy 117A Classic Example: Image Proxies 117
Image Proxies Reconsidered 122
Remote Proxies 125
Dynamic Proxies 131
Summary 136
Chapter 12 Chain of Responsibility 137An Ordinary Chain of Responsibility 137
Refactoring to Chain of Responsibility 139
Anchoring a Chain 142
Chain of Responsibility without Composite 144
Summary 144
Chapter 13 Flyweight 145Immutability 145
Extracting the Immutable Part of a Flyweight 146
Sharing Flyweights 148
Summary 152
Part III Construction Patterns 153 Chapter 14 Introducing Construction 155A Few Construction Challenges 155
Summary 157
Beyond Ordinary Construction 157
Chapter 15 Builder 159An Ordinary Builder 159
Building under Constraints 162
A Forgiving Builder 164
Summary 165
Chapter 16 Factory Method 167A Classic Example: Iterators 167
Recognizing Factory Method 168
Taking Control of Which Class to Instantiate 169
Factory Method in Parallel Hierarchies 171
Summary 173
Chapter 17 Abstract Factory 175A Classic Example: GUI Kits 175
Abstract Factories and Factory Method 180
Packages and Abstract Factories 184
Summary 185
Chapter 18 Prototype 187Prototypes as Factories 187
Prototyping with Clones 189
Summary 192
Chapter 19 Memento 193A Classic Example: Using Memento for Undo 193
Memento Durability 201
Persisting Mementos Across Sessions 201
Summary 205
Part IV Operation Patterns 207 Chapter 20 Introducing Operations 209Operations and Methods 209
Signatures 211
Exceptions 212
Algorithms and Polymorphism 213
Summary 214
Beyond Ordinary Operations 215
Chapter 21 Template Method 217A Classic Example: Sorting 217
Completing an Algorithm 221
Template Method Hooks 224
Refactoring to Template Method 225
Summary 228
Chapter 22 State 229Modeling States 229
Refactoring to State 233
Making States Constant 238
Summary 240
Chapter 23 Strategy 241Modeling Strategies 241
Refactoring to Strategy 244
Comparing Strategy and State 248
Comparing Strategy and Template Method 249
Summary 250
Chapter 24 Command 251A Classic Example: Menu Commands 251
Using Command to Supply a Service 254
Command Hooks 255
Command in Relation to Other Patterns 257
Summary 259
Chapter 25 Interpreter 261An Interpreter Example 261
Interpreters, Languages, and Parsers 274
Summary 275
Part V Extension Patterns 277 Chapter 26 Introducing Extensions 279Principles of Object-Oriented Design 279
The Liskov Substitution Principle 280
The Law of Demeter 281
Removing Code Smells 283
Beyond Ordinary Extensions 283
Summary 285
Chapter 27 Decorator 287A Classic Example: Streams and Writers 287
Function Wrappers 295
Decorator in Relation to Other Patterns 303
Summary 303
Chapter 28 Iterator 305Ordinary Iteration 305
Thread-Safe Iteration 307
Iterating over a Composite 313
Summary 324
Chapter 29 Visitor 325Visitor Mechanics 325
An Ordinary Visitor 327
Visitor Cycles 333
Visitor Risks 338
Summary 340
Part VI Appendixes 341 Appendix A Directions 343Get the Most from This Book 343
Understand the Classics 344
Weave Patterns into Your Code 344
Keep Learning 345
Appendix B Solutions 347 Appendix C Oozinoz Source 427Acquiring and Using the Source 427
Building the Oozinoz Code 427
Testing the Code with JUnit 428
Finding Files Yourself 428
Summary 429
Appendix D UML at a Glance 431Classes 432
Class Relationships 433
Interfaces 435
Objects 436
States 437
Glossary 439Preface
Design patterns are class- and method-level solutions to common problems in object-oriented design. If you're an intermediate-level Java programmer who wants to become advanced or an advanced-level Java programmer who hasn't yet studied design patterns, this book is for you.
Design Patterns in Java™ takes a workbook approach. Each chapter focuses on a particular pattern. In addition to explaining the pattern, the chapter includes a number of challenges, each asking you to explain something or to develop code that solves a problem.
We strongly urge you to stop and work through the challenges rather than try to read this book straight through. You'll learn more by putting in the work to do the challenges, even if it's only a chapter or two a week.
An Update
This book merges and updates two previous books: Design Patterns Java Workbook™; and Design Patterns in C#. This book combines the Java orientation of the former with the more stand-alone approach of the latter. If you've already worked through the previous books, you won't need this one.