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Java Generics and Collections [Englisch] [Taschenbuch]

Maurice Naftalin , Philip Wadler
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Kurzbeschreibung

3. November 2006
This comprehensive guide shows you how to master the most importantchanges to Java since it was first released. Generics and the greatlyexpanded collection libraries have tremendously increased the power ofJava 5 and Java 6. But they have also confused many developers whohaven't known how to take advantage of these new features. Java Generics and Collections covers everything from the mostbasic uses of generics to the strangest corner cases. It teaches youeverything you need to know about the collections libraries, so you'llalways know which collection is appropriate for any given task, andhow to use it. Topics covered include:* Fundamentals of generics: type parameters and generic methods* Other new features: boxing and unboxing, foreach loops, varargs* Subtyping and wildcards* Evolution not revolution: generic libraries with legacy clients andgeneric clients with legacy libraries* Generics and reflection* Design patterns for generics* Sets, Queues, Lists, Maps, and their implementations* Concurrent programming and thread safety with collections* Performance implications of different collections Generics and the new collection libraries they inspired take Java to anew level. If you want to take your software development practice toa new level, this book is essential reading. Philip Wadler is Professor of Theoretical Computer Science at theUniversity of Edinburgh, where his research focuses on the design ofprogramming languages. He is a co-designer of GJ, work thatbecame the basis for generics in Sun's Java 5.0. Maurice Naftalin is Technical Director at Morningside Light Ltd., a software consultancy in the United Kingdom. He has most recently served as an architect and mentor at NSB Retail Systems plc, and as the leader of the client development team of a major UK government social service system. "A brilliant exposition of generics. By far the best book on thetopic, it provides a crystal clear tutorial that starts with thebasics and ends leaving the reader with a deep understanding of boththe use and design of generics." Gilad Bracha, Java Generics Lead, Sun Microsystems

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Produktinformation

  • Taschenbuch: 284 Seiten
  • Verlag: O'Reilly & Associates; Auflage: 1 (3. November 2006)
  • Sprache: Englisch
  • ISBN-10: 0596527756
  • ISBN-13: 978-0596527754
  • Größe und/oder Gewicht: 23,3 x 18 x 1,8 cm
  • Durchschnittliche Kundenbewertung: 4.0 von 5 Sternen  Alle Rezensionen anzeigen (2 Kundenrezensionen)
  • Amazon Bestseller-Rang: Nr. 28.472 in Englische Bücher (Siehe Top 100 in Englische Bücher)

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Produktbeschreibungen

Pressestimmen

"This is a very good book on two fairly focused topics - generics and collections. If you plan to make best use of either or both, buy a copy." - Ian Elliot, VSJ, April 2007

Synopsis

This comprehensive guide shows you how to master the most important changes to Java since it was first released. Generics and the greatly expanded collection libraries have tremendously increased the power of Java 5 and Java 6. But they have also confused many developers who haven't known how to take advantage of these new features. "Java Generics and Collections" covers everything from the most basic uses of generics to the strangest corner cases. It teaches you everything you need to know about the collections libraries, so you'll always know which collection is appropriate for any given task, and how to use it. Topics covered include: Fundamentals of generics: type parameters and generic methods; Other new features: boxing and unboxing, foreach loops, varargs; Subtyping and wildcards; Evolution not revolution: generic libraries with legacy clients and generic clients with legacy libraries; Generics and reflection; Design patterns for generics; Sets, Queues, Lists, Maps, and their implementations; Concurrent programming and thread safety with collections; ane Performance implications of different collections.

Generics and the new collection libraries they inspired take Java to a new level. If you want to take your software development practice to a new level, this book is essential reading.


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5 von 6 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen direkt und praxisnah 23. Januar 2008
Format:Taschenbuch|Von Amazon bestätigter Kauf
beim lesen des buches dachte ich schon nach den ersten paar seiten: "aha, schon etwas gelernt".
mit praxisnahen beispielen und codebeispielen kann man direkt in die konzepte von java generics einsteigen. die beispiele verdeutlichen auch sehr gut die verwendung von wildcards und den extends/super konstrukten, die mir vorher nie ganz klar waren.

sehr interessant sind auch die erläuterungen zum neuen java collection framework, welches im zweiten teil des buches übersichtlich beschrieben wird.
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6 von 9 Kunden fanden die folgende Rezension hilfreich
3.0 von 5 Sternen Generics UND Collections 24. Juni 2007
Von Carlo LF
Format:Taschenbuch|Von Amazon bestätigter Kauf
Der erste Teil dieses Buches behandelt sehr ausführlich das, was der groß geschriebene Teiltitel des Buchtitels auch vespricht, nämlich die mit Java 5 eingezogene neue Möglichkeit, mit generischen Schnittstellen zu arbeiten. Die Generics werden hier sehr ausführlich behandelt, auch mit kritischen Verweisen auf problematische Schnittstellen in der Java API und mit vielen Hinweisen auf Stolperfallen. Was "Erasure" bedeutet und implizit mit sich bringt, wird gut dargestellt. Auch die Fragen, wie man mit "legacy code" umgeht, werden in einem Kapitel und an Beispielen gut diskutiert.

Der 2. Teil des Buches hat zum Thema den kleingeschriebenen Teil des Titels: Collections. Zwar sind die Generics insbesondere in die Collections von Java 5 eingezogen und haben dort das API entsprechend verändert. Die Behandlung im Buch ist aber ein Zwitter. Wenn man wirklich genauer etwas zu Collections lernen möchte, sollte man zu einem anderen Buche greifen. Dieser Teil des Buches hätte durchaus kürzer ausfallen können.
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Amazon.com: 4.2 von 5 Sternen  28 Rezensionen
19 von 19 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen Excellent explanation of Java generics and its usage 3. Dezember 2006
Von calvinnme - Veröffentlicht auf Amazon.com
Format:Taschenbuch
The intent of Generics is make your Java code type-safer. While Java is a strongly typed language, it lacks type-safety when it comes to using collections. Generics were added to the Java programming language in 2004 as part of J2SE 5.0. Unlike C++ templates, generic Java code generates only one compiled version of a generic class. Generic Java classes can only use object types as type parameters -- primitive types are not allowed. Thus a List of type Integer, which uses a primitive wrapper class is legal, while a List of type int is not legal.

Part I of this book provides a thorough introduction to generics. Generics are a powerful, and sometimes controversial, new feature of the Java programming language. This part of the book describes generics, using the Collections Framework as a source of examples.

The first five chapters focus on the fundamentals of generics. Chapter 1 gives an overview of generics and other new features in Java 5, including boxing, foreach loops, and functions with a variable number of arguments. Chapter 2 reviews how subtyping works and explains how wildcards let you use subtyping in connection with generics. Chapter 3 describes how generics work with the Comparable interface, which requires a notion of bounds on type variables. Chapter 4 looks at how generics work with various declarations, including constructors, static members, and nested classes. Chapter 5 explains how to evolve legacy code to exploit generics, and how ease of evolution is a key advantage of the design of generics in Java. Once you have these five chapters under your belt, you will be able to use generics effectively in most basic situations.

The next four chapters treat advanced topics. Chapter 6 explains how the same design that leads to ease of evolution also necessarily leads to a few rough edges in the treatment of casts, exceptions, and arrays. The fit between generics and arrays is the worst rough corner of the language, so two principles are formulated to help work around the problems. Chapter 7 explains new features that relate generics and reflection, including the newly generified type "Class T" and additions to the Java library that support reflection of generic types. Chapter 8 contains advice on how to use generics effectively in practical coding. Checked collections, security issues, specialized classes, and binary compatibility are all considered. Chapter 9 presents five extended examples, looking at how generics affect five well-known design patterns: Visitor, Interpreter, Function, Strategy, and Subject-Observer. The following is a list of chapters in part one:

Chapter 1. Introduction

Chapter 2. Subtyping and Wildcards

Chapter 3. Comparison and Bounds

Chapter 4. Declarations

Chapter 5. Evolution, Not Revolution

Chapter 6. Reification

Chapter 7. Reflection

Chapter 8. Effective Generics

Chapter 9. Design Patterns

Part II is about the Java Collections Framework, which is a set of interfaces and classes in the packages java.util and java.util.concurrent. They provide client programs with various models of how to organize their objects, and various implementations of each model. These models are sometimes called abstract data types, and they are needed because different programs need different ways of organizing their objects. In one situation, you might want to organize your program's objects in a sequential list because their ordering is important and there are duplicates. In another, a set might be the right data type because now ordering is unimportant and you want to discard the duplicates. These two data types and others are represented by different interfaces in the Collections Framework, and there are examples of their use in chapter 10. However, none of these data types has a single "best" implementation--that is, one implementation that is better than all the others for all the operations. For example, a linked list may be better than an array implementation of lists for inserting and removing elements from the middle, but much worse for random access. So choosing the right implementation for a program involves knowing how it will be used as well as what is available.

This part of the book starts with an overview of the Framework and then looks in detail at each of the main interfaces and the standard implementations of them. Finally the book examines the special-purpose implementation and generic algorithms provided in the Collections class. The following is a list of chapters in part two:

Chapter 10. The Main Interfaces of the Java Collections Framework

Chapter 11. Preliminaries

Chapter 12. The Collection Interface

Chapter 13. Sets

Chapter 14. Queues

Chapter 15. Lists

Chapter 16. Maps

Chapter 17. The Collections Class

Overall, this is a very good book on the subject of Java generics, and I highly recommend it.
24 von 26 Kunden fanden die folgende Rezension hilfreich
4.0 von 5 Sternen Good, but could be better 6. Februar 2007
Von Gregory Guthrie - Veröffentlicht auf Amazon.com
Format:Taschenbuch|Von Amazon bestätigter Kauf
Java generics are a welcome and important addition to the Java language, but because of their Erasure based implementation, they are somewhat limited and confusing to use.

This book is good in that it does cover many of the issues, and some interesting applications, but is I think limited in both explanations, and examples. Their section on Generics and Design patterns is a welcome one, but very short, and not very long on rationale or depth on other applications. If the examples they show is the only impact of generics on design patterns, something is wrong!

The standard Generics tutorials by Bracha and Langer, and the IBM DeveloperWorks series by Allen are more complete, and more descriptive, and free! I found the lumping of collections together with Generics ok, but a bit indicative that they ran out of real generics material. They are also IMHO a bit defensive on the long contested Erasure approach, but do explain their viewpoint well. They fault the C# and C++ approaches too quickly, noting the problems but not the corresponding solutions provided. Hopefully next versions of Java will (soon) provide reified versions of generics, it looks like it is in process now.

I did think it a worthwhile read, but not as much as expected.
9 von 9 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen Everything you ever wanted to know about collections and generics... 17. Dezember 2006
Von Thomas Duff - Veröffentlicht auf Amazon.com
Format:Taschenbuch
This is one of the most in-depth books on the Java topics of generics and collections... Java Generics and Collections, by Maurice Naftalin and Philip Wadler. It covers the gamut from the basics to advanced...

Contents:

Part 1 - Generics: Introduction; Subtyping and Wildcards; Comparison and Bounds; Declarations; Evolution, Not Revolution; Reification; Reflection; Effective Generics; Design Patterns

Part 2 - Collections: The Main Interfaces of the Java Collections Framework; Preliminaries; The Collection Interface; Sets; Queues; Lists; Maps; The Collections Class; Index

There have been quite a few books out that deal with the new Java 5.0 features, of which generics and collections are the featured items. But few go past the basics and common usage. Naftalin and Wadler devote this entire book to just those new features, which means they can spend a lot more time diving into the guts of how they work. There are nice "before generics" and "after generics" comparisons in the one section, so you can see how current coding styles can be enhanced and modified. I also liked how some basic design patterns were used to show how generics can be incorporated into standard designs. The collections material is just as helpful. Each type of collection is covered in detail, both for the reference on how it's coded as well as diagrams to show the architecture of that type of list. Again, when you get done with the section, there shouldn't be too many questions and issues surrounding collections that you can't answer or at least figure out.

Solid material, and definitely a title you'll want to have around when you start playing around with generics and collections...
11 von 12 Kunden fanden die folgende Rezension hilfreich
3.0 von 5 Sternen Average, Nothing Exciting... not much more than its online alternative... 11. März 2008
Von J. Brutto - Veröffentlicht auf Amazon.com
Format:Taschenbuch|Von Amazon bestätigter Kauf
It's a decent reference and a great read to go over generics and the collections framework. But don't get me wrong, it's nothing you can't get from just reading the Sun-provided API documentation or tutorials covering the topics.

It's comprehensive, sure... but the examples lean to near overkill on each topic in some areas. In other areas, there just isn't enough information or example code to really drive home the ideas.

It's average and worth the read. Not worth keeping around, though. It's one of those "read-once-then-give-it-to-a-friend" books. Like I said, though: you should definitely read this book if you're looking for more information on these topics. You'll just find yourself hitting resources online for more information in areas you are particularly interested in (concurrency w/ collections, for example).
5 von 5 Kunden fanden die folgende Rezension hilfreich
4.0 von 5 Sternen Ready to Learn Generics and Collections? 1. Februar 2007
Von John Yeary - Veröffentlicht auf Amazon.com
Format:Taschenbuch
The Java Generics book provides an in-depth analysis of the new Generics and Collections APIs in Java 5 and 6. The book provides a level of detail on this new technology that can not be found elsewhere. This book is generally not for a novice programmer due to the level of architectural details and theory. It provides a seasoned programmer with a comprehensive examination of why and how the Generics and Collections APIs were modified, as well as, the design decisions and impact. The book provides the programmer with the information they need to make informed decisions on which type of Collection to use, and the associated pitfalls based on design decisions.

The only issue I found with the book was that it did not provide enough concrete examples. The code was provided generally in code snippets which do not provide enough detail.

The book is a definite choice for the advanced Java programmer and architect. If you are serious about learning these new technologies: this is the book to get.
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