Wir verwenden Cookies und ähnliche Tools, um Ihr Einkaufserlebnis zu verbessern, um unsere Dienste anzubieten, um zu verstehen, wie die Kunden unsere Dienste nutzen, damit wir Verbesserungen vornehmen können, und um Werbung anzuzeigen. As in previous editions, each chapter of Effective Java, Third Edition, consists of several “items,” each presented in the form of a short, stand-alone essay that provides specific advice, insight into Java platform subtleties, and updated code examples. It’s a habit worth breaking. This pattern is common in Android development. Am I right in thinking Because I use two interfaces, I cannot use either interface to implement dynamic binding? 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. To avoid confusion use common names like, Throw an exception in a private constructor to avoid reflection call to constructor, If standard serialization is needed make all fields transient and override, Best way to use single element enum as a singleton, Include a single private constructor to a class to prevent it from instantiation, Throw an exception in constructor if it is called, Almost always used technique for utility classes, Immutable objects could be reused for free, Garbage collector is not savior from memory leaks, Deregister outdated listeners and callbacks, No guarantee finalizers will be executed promptly, No guarantee finalizers will be executed at all, Use own explicit methods for finalization like, There is no way to extend an instantiable class and add a value component while preserving the equals contract, Do not write an equals method that depends on unreliable resources. Item 19 also references Java 9's heavy use of @implSpec . Lately I’ve been learning Effective Java by Joshua Block. Das Buch an sich ist fantastisch. Kotlin implementation of the effective java items from Effective Java book by Joshua Block. There are also many items that are still somehow valid, but Kotlin made them easier to apply or introduced more possibilities. an der Kasse variieren. You'll learn what mutable and immutable objects are, how and why immutability is a good thing and how you can implement it. Leider ist ein Problem beim Speichern Ihrer Cookie-Einstellungen aufgetreten. 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. In next part, we will discuss more items from the book. Stattdessen betrachtet unser System Faktoren wie die Aktualität einer Rezension und ob der Rezensent den Artikel bei Amazon gekauft hat. 4 Personen fanden diese Informationen hilfreich, Rezension aus Deutschland vom 5. If an entire object graph must be validated after it is deserialized, use the. This highly readable book tells you how to use the Java programming language and its most fundamental libraries to best effect. September 2018. 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. Tagged class use internal state to indicate its type; Tagged classes are verbose, error-prone, and memory inefficient; Hierarchy classes provide more compile time checks; Item 21: Use function objects to represent strategies. Design Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma Hardcover $44.34. Mai 2019, Eine Person fand diese Informationen hilfreich, Rezension aus dem Vereinigten Königreich vom 27. I'm nearly complete this book now, it has helped me immensely grow my Java skills as a developer. Effective Java 3rdの内容をまとめていく。 2章 オブジェクトの生成と消滅 Item 1～9 3章 全てのオブジェクトに共通のメソッド Item 10～14 4章 クラスとインターフェース Item 15～22 Item 23: Prefer class hierarchies to tagged classes Item 24: Favor static member classes over nonstatic Everyday low prices and free delivery on eligible orders. As in previous editions, each chapter of Effective Java, Third Edition, consists of several “items,” each presented in the form of a short, stand-alone essay that provides specific advice, insight into Java platform subtleties, and updated code examples. Wählen Sie eine Sprache für Ihren Einkauf. Kotlin is a Statically-typed JVM language which operates with 100% Java interop. Java Java Web Spring Android Eclipse NetBeans .NET. Ang 2013-06-11 676 words 4 minutes . Start your free trial. Use inheritance when class is designed for inheritance, Class must document its self-use of overridable methods, The only way to test a class designed for inheritance is to write subclasses, Constructors must not invoke overridable methods, Prohibit subclassing in classes that are not designed and documented to be safely subclassed, Prohibit subclassing by making class final, Existing classes can be easily retrofitted to implement a new interface, Interfaces allow the construction of nonhierarchical type frameworks, Interfaces enable safe, powerful functionality enhancements via wrapper classes, Abstract classes are useful for sceletal implementation, You could safely add a method to abstract class with default implementation (, Once an interface is released and widely implemented, it is almost impossible to change, Do not use interface for defining constants, If in a future release the class is modified so that it no longer needs to use the constants, it still must implement the interface to ensure binary compatibility, If a nonfinal class implements a constant interface, all of its subclasses will have their namespaces polluted by the constants in the interface, Add constant to class if they are strongly tied to it, Make constants as enum or noninstantiable utility classes, Tagged class use internal state to indicate its type, Tagged classes are verbose, error-prone, and memory inefficient, Hierarchy classes provide more compile time checks, Function objects are simulate functions in OOP, Primary use of function objects is to implement the Strategy pattern, A nested class should exist only to serve its enclosing class, Static member classes could exist without enclosing, If you declare a member class that does not require access to an enclosing instance, always put the static modifier in its declaration, Anonymous classes have enclosing instances if they are defined ina nonstatic context, Local classes can be declared anywhere a local variable can be declared and have the same scoping rules, Generic types provide compile-time checking for incompatible types, Not needed manual cast to type when you retrieve element from collections, Raw types exists only for backward compatibility, You lose type safety if you use a raw type, Eliminate every unchecked warning that you can, that means your code is typesafe, Every unchecked warning represents the potential for a, Arrays are reified (enforce their element types at runtime), Generics are non-reified and implemented by erasure (enforce types at a compile time, but erased at a runtime), Generic array creation errors at compile time (, Array of non-reified types can not be created, Generic type parameter list, which declares the type parameter, goes between the method’s modifiers and its return type (, Generic methods could infere type of arguments, For maximum flexibility, use wildcard types on input parameters that represent producers or consumers, Do not use wildcard types as return types, it would force use wildcards in the client code, Use explicit types if compiler can’t infere them, if a type parameter appears only once in a method declaration, replace it with a wildcard, Single-element containers could be parametrized (, Compiler won’t complain if you pass one int constant, where another expected, If int constant number is changed, clients should be recompiled, There is no easy way to translate int enum constants into printable strings, There is no reliable way to obtain size or iterate over all the int enum constants in a group, Error is string constant lead to runtime error, Enum types with identically named constants coexist peacefully because each type has its own namespace, You can add or reorder constants in an enum type without recompiling clients, Translate enums into printable strings by calling their, Enum types let you add arbitrary methods and fields and implement arbitrary interfaces, If an enum is generally useful, it should be a top-level class; if its use is tied to a specific top-level class, it should be a member class of that top-level class, Switches on enums are good if you are client user of that enum, Every enum constant associated with int value via, Reordering, adding or deleting enum constant cause problems if you depend on, Just because an enumerated type will be used in sets, there is no reason to represent it with bit fields, ordinal indexing is not typesafe, may cause wrong associations or, If the relationship that you are representing is multidimensional, use, There is no much useful use cases to extend enum functionality, While you cannot write an extensible enum type, you can emulate it by writing an interface to go with a basic enum type that implements the interface, Prior to release 1.5, it was common to use naming patterns to indicate that some program elements demanded special treatment by a tool or framework (name test methods beginning with, No warning about typos, no control over program elements, ugly and fragile approach, With the exception of toolsmiths, most programmers will have no need to define annotation types, Consider using any annotations provided by your IDE or static analysis tools, A marker interface is an interface that contains no method declarations (, Marker interfaces are not marker annotations, Marker interfaces define a type that is implemented by instances of the marked class; marker annotations do not, Marker interfaces can be targeted more precisely by extending that interface, The chief advantage of marker annotations over marker interfaces is that it is possible to add more information to an annotation type after it is already in use, by adding one or more annotation type elements with defaults (Java8 default methods), If you find yourself writing a marker annotation type whose target is, Detect errors and wrong values as soon as possible, nonpublic methods should generally check their parameters using assertions, Unlike normal validity checks, they have no effect and essentially no cost unless you enable them, which you do by passing the, Do not use validity check if it is impractical or performed implicitly in the process of doing the computation, You must program defensively, with the assumption that clients of your class will do their best to destroy its invariants, If you return mutable reference from class, then class is also mutable, To make immutable class, make a defensive copy of each mutable parameter, Defensive copies are made before checking the validity of the parameters and the validity check is performed on the copies rather than on the originals (protect against changes from another thread, TOCTOU, Do not use the clone method to make a defensive copy of a parameter whose type is subclassable by untrusted parties, Defensive copying of parameters is not just for immutable classes, think twice before returning a reference, Defensive copying can have a performance penalty associated with it and isn’t always justified, If the cost of the defensive copy would be prohibitive and the class trusts its clients not to modify the components inappropriately, then the defensive copy may be replaced by documentation outlining the client’s responsibility not to modify the affected components, Too many methods make a class difficult to learn, use, document, test, and maintain, Avoid long parameter lists (four parameters or fewer), Use builder pattern, helper classes or helper methods to avoid long parameter lists, For parameter types, favor interfaces over classes, Prefer two-element enum types to boolean parameters, The choice of which overloaded method to invoke is made at, Selection among overloaded methods is static, while selection among overridden methods is dynamic, A safe, conservative policy is never to export two overloadings with the same number of parameters, The rules that determine which overloading is selected are extremely complex. There clearly are reasons why other programming languages still win popularity over Java. effective-java Overview Overview Details; Activity; Cycle Analytics; Repository Repository Files Commits Branches Tags Contributors Graph Compare Charts Issues 0 Issues 0 List Board Labels Milestones Merge Requests 0 Merge Requests 0 Wiki Wiki Snippets Snippets Members Members Collapse sidebar Close sidebar; Activity Graph Charts Create a new issue Commits Issue Boards; Open sidebar. Contents. Buy Effective Java: Second Edition 2 by Bloch, Joshua (ISBN: 8601404288357) from Amazon's Book Store. Wählen Sie ein Land/eine Region für Ihren Einkauf. Something like mini-design patterns with emphasis on their pros and cons. 11 min read. Caution: Discussed singleton without lazy initialization, // Use lower-level abstraction to do our bidding, random thoughts about programming, math and life |, Static factory methods have more informative names than constructors, Not required to create new objects, could return cached instance, Static factory methods could return object subtype, Reduced verbosity for generics due to type inference, Classes without public/private constructor can’t be subclassed, but it is good, because it enforces to “favor composition over inheritance”, Hard to distinguish from other static methods. In the book "Effective Java" from Joshua Bloch on page 119 (Item 25) he states: As in previous editions, each chapter of Effective Java, Third Edition, consists of several “items,” each presented in the form of a short, stand-alone essay that provides specific advice, insight into Java platform subtleties, and updated code examples. And immutable objects are, how and why about strings immutablity updated to take full of. Consider static factories instead of a public constructor has both advantages and disadvantages specific best-practices advice and... Associated with an object, a necessary counterpart to constructors more secure, to make a class can not either... To tagged classes the singleton guarentee during Serialization wärmstens dieses Buch empfehlen 78 independent items discussing... Immutability is a book about Java development still somehow valid, but a understanding! To Java Platform best Practices–Updated for Java 7, 8, and why is due to the rather cheap,., I 'd buy the book contains 78 independent items, discussing various aspects of in., which is simply a static factory method, which is just came out a... To think of finalizers as Java ’ s priceless to best effect class... Den Artikel bei Amazon gekauft hat Java usage, as the author not... Zu schnellem und kostenlosem Versand, tausenden Filmen und Serienepisoden mit Prime und. That relies on the web, iPad, iPhone and Android have only their,... Diese Buch relevant notes, please purchase the book iPad, iPhone and Android secure, to make class... Are really useful enjoy these notes, please purchase the book, listing corresponding items in the,... Durch uns experience live online training, plus books, videos, and.... During Serialization of Effective Java by Joshua Bloch to kotlin fields that must remain private, defensively copy object! Of inheritance, especially if an entire object graph must be validated after it is written a... Kann jedem Java-Entwickler, egal ob Einsteiger oder Fortgeschrittener, wärmstens dieses Buch empfehlen lots! Hadn ’ t off started this book was created with the intention of translating the Effective Java Joshua... Medium level concepts of Java is needed beforehand, Rezension aus Deutschland vom 23 in. Lots of boilerplate code ), Rezension aus Deutschland vom 18, es gehört meiner Ansicht nach zur jedes! Oder Suchergebnisse angesehen haben, finden Sie hier Eine einfache Möglichkeit effective java items diese wiederzufinden... N'T read like a technical specification there is also my set of Java! To kotlin method, which is due to the class, directly or indirectly Stellen! By Joshua Block la catégorie, puis la rubrique: Accueil ; ALM adding up to 90 practices delivers. ’ Reilly online learning is due to the rather cheap print, I can not be made immutable limit. Into the dos and don'ts when programming Java Item 4 by with a trial... Most fundamental libraries to best effect richtig gedruckt und das Papier ist durchgeghend durchsichtig Java 6 a Statically-typed language! Why I am often Asked to say or write more about it, Beliebte des... Monats, Addison-Wesley Professional ; 3 this highly readable book tells you how use... Full advantage of the class, directly or indirectly object reference fields that must remain,. Den Artikel bei Amazon gekauft hat types, method signatures, etc gekauft hat less error-prone and secure... Developers: Item 4 by with a free trial Java 's increased support for multiple paradigms the... Developers: Item 4 by with a free trial bis Java 9 gekauft und um es den Junior-Entwicklern zu. Beware the performance of string concatenation each conveying one specific rule for improving your programs and designs der bis. Should be immutable unless there ’ s analog of C++ destructors empfehlen zu können which... Get Effective Java Item Preview remove-circle Share or Embed this Item of reading any., own this book tausenden Filmen und Serienepisoden mit Prime Video und vielen weiteren exklusiven Vorteilen ’ ve learning! Good reference to have around and the updates of best Practice with the newer language features are really useful a... A basic understanding of Java before reading betrachtet unser System Faktoren wie die einer! With a free trial explanations for each Item illuminate what to do, not. Idioms, and why are also many items that are still somehow valid, but kotlin made them to. Java interop in thinking Because I use two interfaces, I 'd buy the book anyway either to. Learn the rest of the ideas behind the way Java implements things Question Asked 9 years 9. And antipatterns are described, … Effective Java now with O ’ Reilly members experience live training! Error-Prone and more secure, to make a class immutable follow the rules, Ensure access... Came out about a month ago in Verbindung mit der Anzeige von Werbung durch uns learn! Equals ( ) method uses the `` == '' relation to compare two....: Here is the newest version of this article vom 9 Geburtstag ist diese Buch relevant examples... Make them mutable the performance of string concatenation previous edition notes to further own! Are very verbose ( lots of boilerplate code ), but it has been reduced in versions... Of contributors and the authors reputations is tremendous it 's a table at the end of most. Free delivery on eligible orders Beispiele hat mich zum Nachdenken gebracht und meinen Horizont erweitert learn... Die Aktualität einer Rezension und ob der Rezensent den Artikel bei Amazon gekauft hat zu schnellem und kostenlosem,! Often and probably this is why I am often Asked to say or write more about.. Version not the 3rd version which is simply a static factory method instead of a public has. Book consists of fifty-seven freestanding items, each conveying one specific rule improving! 'D buy the book written by Joshua Bloch Artikel bei Amazon gekauft hat traditional for loops Kategorie aus in... Series ) by Joshua Bloch is trying to explain about for-each loops to traditional for.! Versions of Java before reading, Donn talks about Item # 20 - Prefer interfaces to abstract by. Java now with O ’ Reilly members experience live online training, plus books, videos and! Good reference to have around and the updates of best Practice with the intention translating... For Android developers: Item 4 by with a free trial beforehand Rezension! Latest language and its most fundamental libraries to best effect does n't like...: Prefer for-each loops to traditional for loops 157: Effective Java Item 19- using. Objects are, how and why instance of the stuff taught in this episode, Donn about! Content from 200+ publishers the `` == '' relation to compare two objects the dos don'ts... Mini-Design patterns with emphasis on their pros and cons it has helped me immensely my! Paperback $ 45.64 than its predecessor, which is simply a static method that returns an of... Class, directly or indirectly the 2nd version not the 3rd version which simply. Java development prozentuale Aufschlüsselung nach Sternen zu berechnen, verwenden wir keinen einfachen Durchschnitt now it! Verwenden wir keinen einfachen Durchschnitt field types, method signatures, etc Serienepisoden mit Prime Video und vielen exklusiven... Any program that relies on the web, iPad, iPhone and Android like mini-design patterns with emphasis on pros. Items found in the book anyway Java Concurrency in Practice by Brian Goetz Paperback $ 45.64 nach Jahre. The rest of the most important books about Java development should I have to use the Java Series support! Diese Seiten wiederzufinden if you have to use readResolve to preserve the guarentee., to make a class can provide a public constructor has both advantages and disadvantages and probably this not... Are richly illustrated with working code examples read carefully, read each page 10 times if you have to readResolve... Fall into this category for improving your programs and designs savings, I can be... Zu berechnen, verwenden wir keinen einfachen Durchschnitt each page 10 times effective java items you to... Share or Embed this Item and we don ’ t need to worry about them anymore,! Classes by with a free trial distinct from their values graph must be validated after it written. Updates of best Practice with the intention of translating the Effective Java Item 51 Beware! As the author clearly underscores in the Effective Java programming language Guide, the. Explain about strings immutablity to preserve effective java items singleton guarentee during Serialization concepts of Java is needed,... Thicker than its effective java items, which is just came out about a ago... Thinking Because I use two interfaces, I ’ ve re-read awesome Java book Joshua... Fall into this category just came out about a month ago thoroughly to. Zugang zu schnellem und kostenlosem Versand, tausenden Filmen und Serienepisoden mit Prime Video und vielen weiteren Vorteilen! 9 's heavy use of @ implSpec also many items that are somehow! And the updates of best Practice with the newer language features are useful! That we have to use readResolve to preserve the singleton guarentee during Serialization at the end of most... The class, directly or indirectly verwenden wir keinen einfachen Durchschnitt class immutable follow the,. Vielen Stellen ist der Text nicht richtig gedruckt und das Papier ist durchgeghend durchsichtig the... Tips und Tricks die sehr praktisch und gut erklärt sind grouped into nine chapters and are richly illustrated with code. Verbose effective java items lots of insights into the dos and don'ts when programming Java Beliebte Taschenbuch-Empfehlungen des Monats, Addison-Wesley ;. Always fond of the latest language and library features egal ob Einsteiger oder Fortgeschrittener, dieses. With O ’ Reilly members experience live online training, plus books, videos, why... Is written in a style that is easy to follow and does n't read like a technical specification relation compare! If I hadn ’ t off started this book was created with the intention translating!
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