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    Table of Contents
    Preface
    Obtaining the Example Programs
    How to Contact Us
    Conventions Used in This Book
    Using Code Examples
    Safari® Books Online
    Acknowledgments
    Part I. Generics
    Chapter 1. Introduction
    1.1  Generics
    1.2  Boxing and Unboxing
    1.3  Foreach
    1.4  Generic Methods and Varargs
    1.5  Assertions
    Chapter 2. Subtyping and Wildcards
    2.1  Subtyping and the Substitution Principle
    2.2  Wildcards with extends
    2.3  Wildcards with super
    2.4  The Get and Put Principle
    2.5  Arrays
    2.6  Wildcards Versus Type Parameters
    2.7  Wildcard Capture
    2.8  Restrictions on Wildcards
    Chapter 3. Comparison and Bounds
    3.1  Comparable
    3.2  Maximum of a Collection
    3.3  A Fruity Example
    3.4  Comparator
    3.5  Enumerated Types
    3.6  Multiple Bounds
    3.7  Bridges
    3.8  Covariant Overriding
    Chapter 4. Declarations
    4.1  Constructors
    4.2  Static Members
    4.3  Nested Classes
    4.4  How Erasure Works
    Chapter 5. Evolution, Not Revolution
    5.1  Legacy Library with Legacy Client
    5.2  Generic Library with Generic Client
    5.3  Generic Library with Legacy Client
    5.4  Legacy Library with Generic Client
    5.4.1. Evolving a Library using Minimal Changes
    5.4.2. Evolving a Library using Stubs
    5.4.3. Evolving a Library using Wrappers
    5.5  Conclusions
    Chapter 6. Reification
    6.1  Reifiable Types
    6.2  Instance Tests and Casts
    6.3  Exception Handling
    6.4  Array Creation
    6.5  The Principle of Truth in Advertising
    6.6  The Principle of Indecent Exposure
    6.7  How to Define ArrayList
    6.8  Array Creation and Varargs
    6.9  Arrays as a Deprecated Type?
    6.10  Summing Up
    Chapter 7. Reflection
    7.1  Generics for Reflection
    7.2  Reflected Types are Reifiable Types
    7.3  Reflection for Primitive Types
    7.4  A Generic Reflection Library
    7.5  Reflection for Generics
    7.6  Reflecting Generic Types
    Chapter 8. Effective Generics
    8.1  Take Care when Calling Legacy Code
    8.2  Use Checked Collections to Enforce Security
    8.3  Specialize to Create Reifiable Types
    8.4  Maintain Binary Compatibility
    Chapter 9. Design Patterns
    9.1  Visitor
    9.2  Interpreter
    9.3  Function
    9.4  Strategy
    9.5  Subject-Observer
    Part II. Collections
    Chapter 10. The Main Interfaces of the Java Collections Framework
    Chapter 11. Preliminaries
    11.1  Iterable and Iterators
    11.2  Implementations
    11.3  Efficiency and the O-Notation
    11.4  Contracts
    11.5  Collections and Thread Safety
    11.5.1. Synchronization and the Legacy Collections
    11.5.2. JDK 1.2: Synchronized Collections and Fail-Fast Iterators
    11.5.3. Concurrent Collections: Java 5 and Beyond
    Chapter 12. The Collection Interface
    12.1  Using the Methods of Collection
    12.2  Implementing Collection
    12.3  Collection Constructors
    Chapter 13. Sets
    13.1  Implementing Set
    13.1.1. HashSet
    13.1.2. LinkedHashSet
    13.1.3. CopyOnWriteArraySet
    13.1.4. EnumSet
    13.2  SortedSet and NavigableSet
    13.2.1. NavigableSet
    13.2.2. TreeSet
    13.2.3. ConcurrentSkipListSet
    13.3  Comparing Set Implementations
    Chapter 14. Queues
    14.1  Using the Methods of Queue
    14.2  Implementing Queue
    14.2.1. PriorityQueue
    14.2.2. ConcurrentLinkedQueue
    14.3  BlockingQueue
    14.3.1. Using the Methods of BlockingQueue
    14.3.2. Implementing BlockingQueue
    LinkedBlockingQueue
    ArrayBlockingQueue
    PriorityBlockingQueue
    DelayQueue
    SynchronousQueue
    14.4  Deque
    14.4.1. Implementing Deque
    ArrayDeque
    LinkedList
    14.4.2. BlockingDeque
    Implementing BlockingDeque
    14.5  Comparing Queue Implementations
    Chapter 15. Lists
    15.1  Using the Methods of List
    15.2  Implementing List
    15.2.1. ArrayList
    15.2.2. LinkedList
    15.2.3. CopyOnWriteArrayList
    15.3  Comparing List Implementations
    Chapter 16. Maps
    16.1  Using the Methods of Map
    16.2  Implementing Map
    16.2.1. HashMap
    16.2.2. LinkedHashMap
    16.2.3. WeakHashMap
    16.2.4. IdentityHashMap
    16.2.5. EnumMap
    16.3  SortedMap and NavigableMap
    16.3.1. NavigableMap
    16.3.2. TreeMap
    16.4  ConcurrentMap
    16.4.1. ConcurrentHashMap
    16.5  ConcurrentNavigableMap
    16.5.1. ConcurrentSkipListMap
    16.6  Comparing Map Implementations
    Chapter 17. The Collections Class
    17.1  Generic Algorithms
    17.1.1. Changing the Order of List Elements
    17.1.2. Changing the Contents of a List
    17.1.3. Finding Extreme Values in a Collection
    17.1.4. Finding Specific Values in a List
    17.2  Collection Factories
    17.3  Wrappers
    17.3.1. Synchronized Collections
    17.3.2. Unmodifiable Collections
    17.3.3. Checked Collections
    17.4  Other Methods
    Index
    Java Generics and Collections Maurice Naftalin and Philip Wadler Beijing•Cambridge•Farnham•Köln•Sebastopol•Taipei•Tokyo
    Java Generics and Collections by Maurice Naftalin and Philip Wadler Copyright © 2007 O’Reilly Media . All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://safari.oreilly.com). For more information, contact our corporate/ institutional sales department: (800) 998-9938 or corporate@oreilly.com. Editor: Mike Loukides Production Services: Windfall Software Indexers: Maurice Naftalin and Philip Wadler Cover Designer: Karen Montgomery Printing History: October 2006: First Edition. Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly Media, Inc. Java Generics and Collections, the image of an alligator, and related trade dress are trademarks of O’Reilly Media, Inc. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and O’Reilly Media, Inc. was aware of a trademark claim, the designations have been printed in caps or initial caps. While every precaution has been taken in the preparation of this book, the publisher and authors assume no responsibility for errors or omissions, or for damages resulting from the use of the information con- tained herein. This book uses RepKover™, a durable and flexible lay-flat binding. ISBN: 978-0-596-52775-4 [M] 1233352047 [2/09] TM
    We dedicate this book to Joyce Naftalin, Lionel Naftalin, Adam Wadler, and Leora Wadler —Maurice Naftalin and Philip Wadler
    Table of Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi Part I. Generics 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 6 9 10 12 1.1 Generics 1.2 Boxing and Unboxing 1.3 Foreach 1.4 Generic Methods and Varargs 1.5 Assertions 2. Subtyping and Wildcards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 15 17 18 19 22 25 27 28 2.1 Subtyping and the Substitution Principle 2.2 Wildcards with extends 2.3 Wildcards with super 2.4 The Get and Put Principle 2.5 Arrays 2.6 Wildcards Versus Type Parameters 2.7 Wildcard Capture 2.8 Restrictions on Wildcards 3. Comparison and Bounds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 31 34 36 37 42 45 47 49 3.1 Comparable 3.2 Maximum of a Collection 3.3 A Fruity Example 3.4 Comparator 3.5 Enumerated Types 3.6 Multiple Bounds 3.7 Bridges 3.8 Covariant Overriding v
    4. Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 51 52 53 55 4.1 Constructors 4.2 Static Members 4.3 Nested Classes 4.4 How Erasure Works 5.1 Legacy Library with Legacy Client 5.2 Generic Library with Generic Client 5.3 Generic Library with Legacy Client 5.4 Legacy Library with Generic Client 5. Evolution, Not Revolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 60 60 62 65 65 68 68 71 5.4.1 Evolving a Library using Minimal Changes 5.4.2 Evolving a Library using Stubs 5.4.3 Evolving a Library using Wrappers 5.5 Conclusions 6. Reification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 73 74 79 80 82 86 89 90 92 95 6.1 Reifiable Types 6.2 Instance Tests and Casts 6.3 Exception Handling 6.4 Array Creation 6.5 The Principle of Truth in Advertising 6.6 The Principle of Indecent Exposure 6.7 How to Define ArrayList 6.8 Array Creation and Varargs 6.9 Arrays as a Deprecated Type? 6.10 Summing Up 7. Reflection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 97 100 101 101 104 105 7.1 Generics for Reflection 7.2 Reflected Types are Reifiable Types 7.3 Reflection for Primitive Types 7.4 A Generic Reflection Library 7.5 Reflection for Generics 7.6 Reflecting Generic Types 8. Effective Generics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 109 111 112 117 8.1 Take Care when Calling Legacy Code 8.2 Use Checked Collections to Enforce Security 8.3 Specialize to Create Reifiable Types 8.4 Maintain Binary Compatibility vi | Table of Contents
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