Effective Java

0002/E2

Block, Joshua 저자(글)

Addison-Wesley Professional · 2008년 06월 01일

책 소개

Effective Java provides 50 powerful techniques for improving every Java program and design, and includes top-notch code examples and real-world Java development 'war stories'.
Joshua Blochis chief Java architect at Google and a Jolt Award winner. He was previously a distinguished engineer at Sun Microsystems and a senior systems designer at Transarc. Bloch led the design and implementation of numerous Java platform features, including JDK 5.0 language enhancements and the award-winning Java Collections Framework. He coauthored Java??Puzzlers(Addison-Wesley, 2005) and Java??Concurrency in Practice(Addison-Wesley, 2006).
Joshua Bloch is chief Java architect at Google.
This book is designed to help Java programmers make the most effective use of the Java programming language and its fundamental libraries, java.lang, java.util, and java.io. There are over 50 items or essays, each of which conveys one rule. Each rule captures best practices that have been tested in the real world. Just one of the key features in this book are the code examples that illustrate many useful design patterns and idoms. Another key feature is the advice on what not to do. Providing examples of what practices to avoid helps programmers side step common misconceptions and errors. While the second edition will cover all of the classic topics developers have come to rely on- objects, classes, libraries, methods, and serialization; new to this edition will be the coverage on generics, metadata, autoboxing, concurrency utilities, memory model, enumerations, and more. The book is based on the philosophy that clarity and simplicity are of paramount importance. The concise essays teach Java programmers of all levels how to write correct, clear, reusable, and effective code. Learning the art of Java programming, like most other disciples, consists of learning the rules and then learning when to violate them. With this book in hand, Java programmers will truly learn the rules and then learn when to violate them.
Preface to the Second Edition A lot has happened to the Java platform since I wrote the first edition of this book in 2001, and it's high time for a second edition. The most significant set of changes was the addition of generics, enum types, annotations, autoboxing, and the for-each loop in Java 5. A close second was the addition of the new concurrency library,java.util.concurrent, also released in Java 5. With Gilad Bracha, I had the good fortune to lead the teams that designed the new language features. I also had the good fortune to serve on the team that designed and developed the concurrency library, which was led by Doug Lea. The other big change in the platform is the widespread adoption of modern Integrated Development Environments (IDEs), such as Eclipse, IntelliJ IDEA, and NetBeans, and of static analysis tools, such as FindBugs. While I have not been involved in these efforts, I've benefited from them immensely and learned how they affect the Java development experience. In 2004, I moved from Sun to Google, but I've continued my involvement in the development of the Java platform over the past four years, contributing to the concurrency and collections APIs through the good offices of Google and the Java Community Process. I've also had the pleasure of using the Java platform to develop libraries for use within Google. Now I know what it feels like to be a user. As was the case in 2001 when I wrote the first edition, my primary goal is to share my experience with you so that you can imitate my successes while avoiding my failures. The new material continues to make liberal use of real-world examples from the Java platform libraries. The first edition succeeded beyond my wildest expectations, and I've done my best to stay true to its spirit while covering all of the new material that was required to bring the book up to date. It was inevitable that the book would grow, and grow it did, from fifty-seven items to seventy-eight. Not only did I add twenty-three items, but I thoroughly revised all the original material and retired a few items whose better days had passed. In the Appendix, you can see how the material in this edition relates to the material in the first edition. In the Preface to the First Edition, I wrote that the Java programming language and its libraries were immensely conducive to quality and productivity, and a joy to work with. The changes in releases 5 and 6 have taken a good thing and made it better. The platform is much bigger now than it was in 2001 and more complex, but once you learn the patterns and idioms for using the new features, they make your programs better and your life easier. I hope this edition captures my continued enthusiasm for the platform and helps make your use of the platform and its new features more effective and enjoyable. San Jose, California April 2008
Preface to the Second EditionA lot has happened to the Java platform since I wrote the first edition of this book in 2001, and it's high time for a second edition. The most significant set of changes was the addition of generics, enum types, annotations, autoboxing, and the for-each loop in Java 5. A close second was the addition of the new concurrency library, java.util.concurrent , also released in Java 5. With Gilad Bracha, I had the good fortune to lead the teams that designed the new language features. I also had the good fortune to serve on the team that designed and developed the concurrency library, which was led by Doug Lea.The other big change in the platform is the widespread adoption of modern Integrated Development Environments (IDEs), such as Eclipse, IntelliJ IDEA, and NetBeans, and of static analysis tools, such as FindBugs. While I have not been involved in these efforts, I've benefited from them immensely and learned how they affect the Java development experience.In 2004, I moved from Sun to Google, but I've continued my involvement in the development of the Java platform over the past four years, contributing to the concurrency and collections APIs through the good offices of Google and the Java Community Process. I've also had the pleasure of using the Java platform to develop libraries for use within Google. Now I know what it feels like to be a user.As was the case in 2001 when I wrote the first edition, my primary goal is to share my experience with you so that you can imitate my successes while avoiding my failures. The new material continues to make liberal use of real-world examples from the Java platform libraries.The first edition succeeded beyond my wildest expectations, and I've done my best to stay true to its spirit while covering all of the new material that was required to bring the book up to date. It was inevitable that the book would grow, and grow it did, from fifty-seven items to seventy-eight. Not only did I add twenty-three items, but I thoroughly revised all the original material and retired a few items whose better days had passed. In the Appendix, you can see how the material in this edition relates to the material in the first edition.In the Preface to the First Edition, I wrote that the Java programming language and its libraries were immensely conducive to quality and productivity, and a joy to work with. The changes in releases 5 and 6 have taken a good thing and made it better. The platform is much bigger now than it was in 2001 and more complex, but once you learn the patterns and idioms for using the new features, they make your programs better and your life easier. I hope this edition captures my continued enthusiasm for the platform and helps make your use of the platform and its new features more effective and enjoyable.San Jose, California April 2008
Raves for the First Edition! "I sure wish I had this book ten years ago. Some might think that I don't need any Java books, but I need this one." -James Gosling, fellow and vice president, Sun Microsystems, Inc. "An excellent book, crammed with good advice on using the Java programming language and object-oriented programming in general." -Gilad Bracha, coauthor of The Java'? Language Specification, Third Edition "10/10-anyone aspiring to write good Java code that others will appreciate reading and maintaining should be required to own a copy of this book. This is one of those rare books where the information won't become obsolete with subsequent releases of the JDK library." -Peter Tran, bartender, JavaRanch.com "The best Java book yet written.... Really great; very readable and eminently useful. I can't say enough good things about this book. At JavaOne 2001, James Gosling said, 'Go buy this book!' I'm glad I did, and I couldn't agree more." -Keith Edwards, senior member of research staff, Computer Science Lab at the Palo Alto Research Center (PARC), and author of Core JINI (Prentice Hall, 2000) "This is a truly excellent book done by the guy who designed several of the better recent Java platform APIs (including the Collections API)." -James Clark, technical lead of the XML Working Group during the creation of the XML 1.0 Recommendation, editor of the XPath and XSLT Recommendations "Great content. Analogous to Scott Meyers' classic Effective C++. If you know the basics of Java, this has to be your next book." -Gary K. Evans, OO mentor and consultant, Evanetics, Inc "Josh Bloch gives great insight into best practices that really can only be discovered after years of study and experience." -Mark Mascolino, software engineer "This is a superb book. It clearly covers many of the language/platform subtleties and trickery you need to learn to become a real Java master." -Victor Wiewiorowski, vice president development and code quality manager, ValueCommerce Co., Tokyo, Japan "I like books that under-promise in their titles and over-deliver in their contents. This book has 57 items of programming advice that are well chosen. Each item reveals a clear, deep grasp of the language. Each one illustrates in simple, practical terms the limits of programming on intuition alone, or taking the most direct path to a solution without fully understanding what the language offers." -Michael Ernest, Inkling Research, Inc. "I don't find many programming books that make me want to read every page-this is one of them." -Matt Tucker, chief technical officer, Jive Software "Great how-to resource for the experienced developer." -John Zukowski, author of numerous Java technology books "I picked this book up two weeks ago and can safely say I learned more about the Java language in three days of reading than I did in three months of study! An excellent book and a welcome addition to my Java library." -Jane Griscti, I/T advisory specialist Are you lookin
Are you looking for a deeper understanding of the Java" programming language so that you can write code that is clearer, more correct, more robust, and more reusable? Look no further! Effective Java", Second Edition,brings together seventy-eight indispensable programmer?? rules of thumb: working, best-practice solutions for the programming challenges you encounter every day. This highly anticipated new edition of the classic, Jolt Award-winning work has been thoroughly updated to cover Java SE 5 and Java SE 6 features introduced since the first edition. Bloch explores new design patterns and language idioms, showing you how to make the most of features ranging from generics to enums, annotations to autoboxing. Each chapter in the book consists of several ??tems??presented in the form of a short, standalone essay that provides specific advice, insight into Java platform subtleties, and outstanding code examples. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why. Highlights include: New coverage of generics, enums, annotations, autoboxing, the for-each loop, varargs, concurrency utilities, and much more Updated techniques and best practices on classic topics, including objects, classes, libraries, methods, and serialization How to avoid the traps and pitfalls of commonly misunderstood subtleties of the language Focus on the language and its most fundamental libraries: java.lang, java.util, and, to a lesser extent, java.util.concurrent and java.io Simply put, Effective Java", Second Edition,presents the most practical, authoritative guidelines available for writing efficient, well-designed programs.
Are you looking for a deeper understanding of the Java??programming language so that you can write code that is clearer, more correct, more robust, and more reusable? Look no further! Effective Java?? Second Edition,brings together seventy-eight indispensable programmer's rules of thumb: working, best-practice solutions for the programming challenges you encounter every day. This highly anticipated new edition of the classic, Jolt Award-winning work has been thoroughly updated to cover Java SE 5 and Java SE 6 features introduced since the first edition. Bloch explores new design patterns and language idioms, showing you how to make the most of features ranging from generics to enums, annotations to autoboxing. Each chapter in the book consists of several "items" presented in the form of a short, standalone essay that provides specific advice, insight into Java platform subtleties, and outstanding code examples. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why. Highlights include: New coverage of generics, enums, annotations, autoboxing, the for-each loop, varargs, concurrency utilities, and much more Updated techniques and best practices on classic topics, including objects, classes, libraries, methods, and serialization How to avoid the traps and pitfalls of commonly misunderstood subtleties of the language Focus on the language and its most fundamental libraries: java.lang, java.util, and, to a lesser extent, java.util.concurrent and java.io Simply put, Effective Java?? Second Edition,presents the most practical, authoritative guidelines available for writing efficient, well-designed programs.
Are you looking for a deeper understanding of the Java??programming language so that you can write code that is clearer, more correct, more robust, and more reusable? Look no further!Effective Java?? Second Edition,brings together seventy-eight indispensable programmer's rules of thumb: working, best-practice solutions for the programming challenges you encounter every day. This highly anticipated new edition of the classic, Jolt Award-winning work has been thoroughly updated to cover Java SE 5 and Java SE 6 features introduced since the first edition. Bloch explores new design patterns and language idioms, showing you how to make the most of features ranging from generics to enums, annotations to autoboxing. Each chapter in the book consists of several "items" presented in the form of a short, standalone essay that provides specific advice, insight into Java platform subtleties, and outstanding code examples. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why. Highlights include: New coverage of generics, enums, annotations, autoboxing, the for-each loop, varargs, concurrency utilities, and much more Updated techniques and best practices on classic topics, including objects, classes, libraries, methods, and serialization How to avoid the traps and pitfalls of commonly misunderstood subtleties of the language Focus on the language and its most fundamental libraries: java.lang, java.util, and, to a lesser extent, java.util.concurrent and java.io Simply put,Effective Java?? Second Edition,presents the most practical, authoritative guidelines available for writing efficient, well-designed programs.
Designed to help Java programmers make the most effective use of the Java programming language and its fundamental libraries, this updated edition includes more than 50 essays, each of which conveys one rule. Helping programmers sidestep common misconceptions and errors, each rule captures best practices that have been tested in the real world.
Raves for the First Edition! "I sure wish I had this book ten years ago. Some might think that I don't need any Java books, but I need this one." -James Gosling, fellow and vice president, Sun Microsystems, Inc. "An excellent book, crammed with good advice on using the Java programming language and object-oriented programming in general." -Gilad Bracha, coauthor ofThe Java??Language Specification, Third Edition "10/10-anyone aspiring to write good Java code that others will appreciate reading and maintaining should be required to own a copy of this book. This is one of those rare books where the information won't become obsolete with subsequent releases of the JDK library." -Peter Tran, bartender, JavaRanch.com "The best Java book yet written.... Really great; very readable and eminently useful. I can't say enough good things about this book. At JavaOne 2001, James Gosling said, 'Go buy this book!' I'm glad I did, and I couldn't agree more." -Keith Edwards, senior member of research staff, Computer Science Lab at the Palo Alto Research Center (PARC), and author ofCore JINI(Prentice Hall, 2000) "This is a truly excellent book done by the guy who designed several of the better recent Java platform APIs (including the Collections API)." -James Clark, technical lead of the XML Working Group during the creation of the XML 1.0 Recommendation, editor of the XPath and XSLT Recommendations "Great content. Analogous to Scott Meyers' classicEffective C++.If you know the basics of Java, this has to be your next book." -Gary K. Evans, OO mentor and consultant, Evanetics, Inc "Josh Bloch gives great insight into best practices that really can only be discovered after years of study and experience." -Mark Mascolino, software engineer "This is a superb book. It clearly covers many of the language/platform subtleties and trickery you need to learn to become a real Java master." -Victor Wiewiorowski, vice president development and code quality manager, ValueCommerce Co., Tokyo, Japan "I like books that under-promise in their titles and over-deliver in their contents. This book has 57 items of programming advice that are well chosen. Each item reveals a clear, deep grasp of the language. Each one illustrates in simple, practical terms the limits of programming on intuition alone, or taking the most direct path to a solution without fully understanding what the language offers." -Michael Ernest, Inkling Research, Inc. "I don't find many programming books that make me want to read every page-this is one of them." -Matt Tucker, chief technical officer, Jive Software "Great how-to resource for the experienced developer." -John Zukowski, author of numerous Java technology books "I picked this book up two weeks ago and can safely
Raves for the First Edition! "I sure wish I had this book ten years ago. Some might think that I don't need any Java books, but I need this one." -James Gosling, fellow and vice president, Sun Microsystems, Inc. "An excellent book, crammed with good advice on using the Java programming language and object-oriented programming in general." -Gilad Bracha, coauthor of The Java??Language Specification, Third Edition "10/10-anyone aspiring to write good Java code that others will appreciate reading and maintaining should be required to own a copy of this book. This is one of those rare books where the information won't become obsolete with subsequent releases of the JDK library." -Peter Tran, bartender, JavaRanch.com "The best Java book yet written.... Really great; very readable and eminently useful. I can't say enough good things about this book. At JavaOne 2001, James Gosling said, 'Go buy this book!' I'm glad I did, and I couldn't agree more." -Keith Edwards, senior member of research staff, Computer Science Lab at the Palo Alto Research Center (PARC), and author of Core JINI(Prentice Hall, 2000) "This is a truly excellent book done by the guy who designed several of the better recent Java platform APIs (including the Collections API)." -James Clark, technical lead of the XML Working Group during the creation of the XML 1.0 Recommendation, editor of the XPath and XSLT Recommendations "Great content. Analogous to Scott Meyers' classicEffective C++. If you know the basics of Java, this has to be your next book." -Gary K. Evans, OO mentor and consultant, Evanetics, Inc "Josh Bloch gives great insight into best practices that really can only be discovered after years of study and experience." -Mark Mascolino, software engineer "This is a superb book. It clearly covers many of the language/platform subtleties and trickery you need to learn to become a real Java master." -Victor Wiewiorowski, vice president development and code quality manager, ValueCommerce Co., Tokyo, Japan "I like books that under-promise in their titles and over-deliver in their contents. This book has 57 items of programming advice that are well chosen. Each item reveals a clear, deep grasp of the language. Each one illustrates in simple, practical terms the limits of programming on intuition alone, or taking the most direct path to a solution without fully understanding what the language offers." -Michael Ernest, Inkling Research, Inc. "I don't find many programming books that make me want to read every page-this is one of them." -Matt Tucker, chief technical officer, Jive Software "Great how-to resource for the experienced developer." -John Zukowski, author of numerous Java technology books "I picked this book up two weeks ago and can safely say I learned more about the Java language in three days of reading than I did in three months of study! An excellent book and a welcome addition to my Java library." -Jane Griscti, I/T advisory specialist
Raves for the First Edition! ?? sure wish I had this book ten years ago. Some might think that I don?? need any Java books, but I need this one.??-James Gosling, fellow and vice president, Sun Microsystems, Inc. ??n excellent book, crammed with good advice on using the Java programming language and object-oriented programming in general.??-Gilad Bracha, coauthor of The Java" Language Specification, Third Edition ??0/10-anyone aspiring to write good Java code that others will appreciate reading and maintaining should be required to own a copy of this book. This is one of those rare books where the information won?? become obsolete with subsequent releases of the JDK library.??-Peter Tran, bartender, JavaRanch.com ??he best Java book yet written.... Really great; very readable and eminently useful. I can?? say enough good things about this book. At JavaOne 2001, James Gosling said, ??o buy this book!??I?? glad I did, and I couldn?? agree more.??-Keith Edwards, senior member of research staff, Computer Science Lab at the Palo Alto Research Center (PARC), and author of Core JINI(Prentice Hall, 2000) ??his is a truly excellent book done by the guy who designed several of the better recent Java platform APIs (including the Collections API).??-James Clark, technical lead of the XML Working Group during the creation of the XML 1.0 Recommendation, editor of the XPath and XSLT Recommendations ??reat content. Analogous to Scott Meyers??classicEffective C++. If you know the basics of Java, this has to be your next book.??-Gary K. Evans, OO mentor and consultant, Evanetics, Inc ??osh Bloch gives great insight into best practices that really can only be discovered after years of study and experience.??-Mark Mascolino, software engineer ??his is a superb book. It clearly covers many of the language/platform subtleties and trickery you need to learn to become a real Java master.??-Victor Wiewiorowski, vice president development and code quality manager, ValueCommerce Co., Tokyo, Japan ?? like books that under-promise in their titles and over-deliver in their contents. This book has 57 items of programming advice that are well chosen. Each item reveals a clear, deep grasp of the language. Each one illustrates in simple, practical terms the limits of programming on intuition alone, or taking the most direct path to a solution without fully understanding what the language offers.??-Michael Ernest, Inkling Research, Inc. ?? don?? find many programming books that make me want to read every page-this is one of them.??-Matt Tucker, chief technical officer, Jive Software ??reat how-to resource for the experienced developer.??-John Zukowski, author of numerous Java technology books ?? picked this book up two weeks ago and can safely say I learned more about the Java language in three days of reading than I did in three months of study! An excellent book and a welcome addition to my Java library.??-Jane Griscti, I/T advisory specialist
Foreword xiPreface xiiiAcknowledgments xviiChapter 1: Introduction 1Chapter 2: Creating and Destroying Objects 5Item 1: Consider static factory methods instead of constructors 5Item 2: Consider a builder when faced with many constructorparameters 11Item 3: Enforce the singleton property with a private constructor 17Item 4: Enforce noninstantiability with a private constructor 19Item 5: Avoid creating unnecessary objects 20Item 6: Eliminate obsolete object references 24Item 7: Avoid finalizers 27Chapter 3: Methods Common to All Objects 33Item 8: Obey the general contract when overriding equals 33Item 9: Always override hashCode when you override equals 45Item 10: Always override toString 51Item 11: Override clone judiciously 54Item 12: Consider implementing Comparable 62Chapter 4: Classes and Interfaces 67Item 13: Minimize the accessibility of classes and members 67Item 14: In public classes, use accessor methods, not public fields 71Item 15: Minimize mutability 73Item 16: Favor composition over inheritance 81Item 17: Design and document for inheritance or else prohibit it 87Item 18: Prefer interfaces to abstract classes 93Item 19: Use interfaces only to define types 98Item 20: Prefer class hierarchies to tagged classes 100Item 21: Use function objects to represent strategies 103Item 22: Favor static member classes over nonstatic 106Chapter 5: Generics 109 Item 23: Don't use raw types in new code 109 Item 24: Eliminate unchecked warnings 116 Item 25: Prefer lists to arrays 119 Item 26: Favor generic types 124 Item 27: Favor generic methods 129 Item 28: Use bounded wildcards to increase API flexibility 134 Item 29: Consider typesafe heterogeneous containers 142 Chapter 6: Enums and Annotations 147 Item 30: Use enums instead of int constants 147 Item 31: Use instance fields instead of ordinals 158 Item 32: Use EnumSet instead of bit fields 159 Item 33: Use EnumMap instead of ordinal indexing 161 Item 34: Emulate extensible enums with interfaces 165 Item 35: Prefer annotations to naming patterns 169 Item 36: Consistently use the Override annotation 176 Item 37: Use marker interfaces to define types 179 Chapter 7: Methods 181 Item 38: Check parameters for validity 181 Item 39: Make defensive copies when needed 184 Item 40: Design method signatures carefully 189 Item 41: Use overloading judiciously 191 Item 42: Use varargs judiciously 197 Item 43: Return empty arrays or collections, not nulls 201 Item 44: Write doc comments for all exposed API elements 203 Chapter 8: General Programming 209 Item 45: Minimize the scope of local variables 209 Item 46: Prefer for-each loops to traditional for loops 212 Item 47: Know and use the libraries 215 Item 48: Avoid float and double if exact answers are required 218 Item 49: Prefer primitive type

작가정보

저자(글) Block, Joshua

목차

• Foreword	p. xi
  Preface	p. xiii
  Acknowledgments	p. xvii
  Introduction	p. 1
  Creating and Destroying Objects	p. 5
  Consider static factory methods instead of constructors	p. 5
  Consider a builder when faced with many constructorparameters	p. 11
  Enforce the singleton property with a private constructor	p. 17
  Enforce noninstantiability with a private constructor	p. 19
  Avoid creating unnecessary objects	p. 20
  Eliminate obsolete object references	p. 24
  Avoid finalizers	p. 27
  Methods Common to All Objects	p. 33
  Obey the general contract when overriding equals	p. 33
  Always override hashCode when you override equals	p. 45
  Always override toString	p. 51
  Override clone judiciously	p. 54
  Consider implementing Comparable	p. 62
  Classes and Interfaces	p. 67
  Minimize the accessibility of classes and members	p. 67
  In public classes, use accessor methods, not public fields	p. 71
  Minimize mutability	p. 73
  Favor composition over inheritance	p. 81
  Design and document for inheritance or else prohibit it	p. 87
  Prefer interfaces to abstract classes	p. 93
  Use interfaces only to define types	p. 98
  Prefer class hierarchies to tagged classes	p. 100
  Use function objects to represent strategies	p. 103
  Favor static member classes over nonstatic	p. 106
  Generics	p. 109
  Don't use raw types in new code	p. 109
  Eliminate unchecked warnings	p. 116
  Prefer lists to arrays	p. 119
  Favor generic types	p. 124
  Favor generic methods	p. 129
  Use bounded wildcards to increase API flexibility	p. 134
  Consider typesafe heterogeneous containers	p. 142
  Enums and Annotations	p. 147
  Use enums instead of int constants	p. 147
  Use instance fields instead of ordinals	p. 158
  Use EnumSet instead of bit fields	p. 159
  Use EnumMap instead of ordinal indexing	p. 161
  Emulate extensible enums with interfaces	p. 165
  Prefer annotations to naming patterns	p. 169
  Consistently use the Override annotation	p. 176
  Use marker interfaces to define types	p. 179
  Methods	p. 181
  Check parameters for validity	p. 181
  Make defensive copies when needed	p. 184
  Design method signatures carefully	p. 189
  Use overloading judiciously	p. 191
  Use varargs judiciously	p. 197
  Return empty arrays or collections, not nulls	p. 201
  Write doc comments for all exposed API elements	p. 203
  General Programming	p. 209
  Minimize the scope of local variables	p. 209
  Prefer for-each loops to traditional for loops	p. 212
  Know and use the libraries	p. 215
  Avoid float and double if exact answers are required	p. 218
  Prefer primitive type
  Table of Contents provided by Publisher. All Rights Reserved.

기본정보

ISBN	9780321356680 ( 0321356683 )
발행(출시)일자	2008년 06월 01일
쪽수	346쪽
크기	187 * 235 * 25 mm / 757 g
총권수	1권
언어	영어