Implementation Patterns

Preface xv Chapter 1: Introduction 1 Tour Guide 3 And Now... 4 Chapter 2: Patterns 5 Chapter 3: A Theory of Programming 9 Values 10 Principles 13 Conclusion 18 Chapter 4: Motivation 19 Chapter 5: Class 21 Class 22 Simple Superclass Name 23 Qualified Subclass Name 24 Abstract Interface 24 Interface 26 Abstract Class 26 Versioned Interface 27 Value Object 28 Specialization 31 Subclass 32 Implementor 34 Inner Class 34 Instance-Specific Behavior 36 Conditional 36 Delegation 38 Pluggable Selector 40 Anonymous Inner Class 41 Library Class 41 Conclusion 42 Chapter 6: State 43 State 44 Access 45 Direct Access 46 Indirect Access 47 Common State 47 Variable State 48 Extrinsic State 50 Variable 50 Local Variable 51 Field 52 Parameter 53 Collecting Parameter 55 Optional Parameter 56 Var Args 56 Parameter Object 57 Constant 58 Role-Suggesting Name 58 Declared Type 60 Initialization 61 Eager Initialization 61 Lazy Initialization 62 Conclusion 62 Chapter 7: Behavior 63 Control Flow 64 Main Flow 64 Message 65 Choosing Message 65 Double Dispatch 66 Decomposing (Sequencing) Message 67 Reversing Message 67 Inviting Message 68 Explaining Message 69 Exceptional Flow 70 Guard Clause 70 Exception 72 Checked Exceptions 72 Exception Propagation 73 Conclusion 73 Chapter 8: Methods 75 Composed Method 77 Intention-Revealing Name 79 Method Visibility 80 Method Object 82 Overridden Method 83 Overloaded Method 83 Method Return Type 84 Method Comment 85 Helper Method 85 Debug Print Method 86 Conversion 87 Conversion Method 87 Conversion Constructor 88 Creation 88 Complete Constructor 89 Factory Method 90 Internal Factory 91 Collection Accessor Method 91 Boolean Setting Method 93 Query Method 93 Equality Method 94 Getting Method 95 Setting Method 96 Safe Copy 97 Conclusion 98 Chapter 9: Collections 99 Metaphors 100 Issues 101 Interfaces 103 Implementations 107 Collections 110 Extending Collections 114 Conclusion 115 Chapter 10: Evolving Frameworks 117 Changing Frameworks without Changing

Kent Beck is the founder and director of Three Rivers Institute (TRI). He has pioneered patterns for software development, the XUnit family of test frameworks, the HotDraw drawing editor framework, CRC cards, refactoring, and most recently eXtreme Programming (XP). He lives on 20 acres in rural southern Oregon.