Primitives have only their values, whereas boxed primitives have identities distinct from their values. Reflection provides programmatic access to the class’s member names, field types, method signatures, etc. The code examples are the real gold in this book, very concise and helpful. If you enjoy these notes, please purchase the book! We use cookies and similar tools to enhance your shopping experience, to provide our services, understand how customers use our services so we can make improvements, and display ads. I'm nearly complete this book now, it has helped me immensely grow my Java skills as a developer. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why. This book gives lots of insights into the dos and don'ts when programming Java. Ships from and sold by Amazon.com. Java has changed dramatically since the previous edition of Effective Java was published shortly after the release of Java 6. 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 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. Viewed 1k times 0. Effective Java Item 7: Avoid finalizer. Item 1 is talking about static factory methods. The third edition covers language and library features added in Java 7, 8, and 9, including the functional programming constructs that were added to its object-oriented roots. Avoid finalizer. Java's increased support for multiple paradigms increases the need for best-practices advice, and this book delivers. Select Your Cookie Preferences. Kaufen! If a class cannot be made immutable, limit its mutability as much as possible. Effective Java Item 46: Prefer for-each loops to traditional for loops. Effective Java(tm), Second Edition,brings together seventy-eight indispensable programmer's rules of thumb: working, best-practice solutions for the programming challenges you encounter every day. The serialization proxy pattern has some limitations: It is not compatible with classes that are extendable by their clients, It is not compatible with some classes whose object graphs contain circularities, Serialization is slower than standard approach. Item 1: Consider static factory methods instead of constructors; Item 2: Consider a builder when faced with many constructor parameters Item 3: Enforce the singleton property with a private constructor or an enum type; Item 4: Enforce noninstantiability with a private constructor Das Buch an sich ist fantastisch. In this new edition of Effective Java, Bloch explores new design patterns and language idioms that have been introduced since the second edition was released in 2008 shortly after Java SE6, including Lambda, streams, generics and collections, as well as selected Java 9 features. Ihre zuletzt angesehenen Artikel und besonderen Empfehlungen. Details. Effective Java #77 states that we have to use readResolve to preserve the Singleton guarentee during serialization. Effective Java Item #77 - Serialization of singleton objects - Why should I have to use readResolve? Pretty good, but a basic understanding of Java is needed beforehand, Rezension aus dem Vereinigten Königreich vom 9. Etwas ist schiefgegangen. Miraculously the new edition still is no thicker than its predecessor, which is due to the rather cheap print, i'm afraid. To satisfy singleton property for serializable object, implement, Use enum types to enforce instance control invariants wherever possible, Serialization proxy is a private static inner class implements Serializable and reflects serializable data for original object. The default implementation of the equals() method uses the "==" relation to compare two objects. For example, when we are using Toast, we pass parameters and the static methods will return a Toast instance for us depending on the parameters. Read unlimited* books and audiobooks on the web, iPad, iPhone and Android. Jun 3, 2018 • Ivan. Buy Effective Java: Second Edition 2 by Bloch, Joshua (ISBN: 8601404288357) from Amazon's Book Store. This is the first article about Effective Java Items. Do not invoke any overridable methods in the class, directly or indirectly. ALM Merise UML Java. Mai 2020, Auch nach 25 Jahre Java Geburtstag ist diese Buch relevant. This book was created with the intention of translating the effective java items found in the book written by Joshua Bloch to Kotlin. 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. 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 14 Personen fanden diese Informationen hilfreich, Rezension aus Deutschland vom 23. A source of wisdom in times of confusion. Read 157: Effective Java Item# 20 - Prefer interfaces to abstract classes by with a free trial. Ask Question Asked 8 years, 4 months ago. I have been working as a Java developer for 15 years now, have had multiple copies of this book, keep loaning them to people then changing jobs and forgetting about the book. Older programming languages, such as C, mandated that local variables must be declared at the head of a block, and some programmers continue to do this out of habit. Effective Java Kotlin is a Statically-typed JVM language which operates with 100% Java interop. Je nach Lieferadresse kann die USt. This highly readable book tells you how to use the Java programming language and its most fundamental libraries to best effect. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why. by Joshua Bloch. It’s a habit worth breaking. Jedes der Beispiele hat mich zum Nachdenken gebracht und meinen Horizont erweitert. Ausgabe nur sehr stark empfehlen, Rezension aus Deutschland vom 3. September 2018. USt. Chapter 2: Creating and Destroying Objects Item 1: Consider static factories instead of constructors. O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers. September 2018. Chapter 2. Providing a static factory method instead of a public constructor has both advantages and disadvantages. This pattern is common in Android development. Never do anything time-critical in finalizers. Mai 2019, Eine Person fand diese Informationen hilfreich, Rezension aus dem Vereinigten Königreich vom 27. Juni 2019. Function objects are simulate functions in OOP He discusses why you should think about using interfaces over abstract classes, how they can add mixin like behavior to retrofit existing classes with new behavior, default methods, skeleton implementations and more. A class can provide a public static factory method, which is simply a static method that returns an instance of the class. Update: Here is the newest version of this article. Return defensive copies, Not only can you share immutable objects, but you can share their internals, The only real disadvantage of immutable classes is that they require a separate object for each distinct value. Bitte versuchen Sie es erneut. Builder pattern is used to tackle problem where class contains a large number of optional parameters, besides builder pattern there are two other methods: Telescoping constructor pattern and JavaBeans Pattern, they all have some limits. 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. 2 Personen fanden diese Informationen hilfreich, Rezension aus Deutschland vom 18. This Jolt award-winning classic has now been thoroughly updated to take full advantage of the latest language and library features. Ich habe es mir jetzt hauptsächlich wegen der Neuerungen bis Java 9 gekauft und um es den Junior-Entwicklern empfehlen zu können. 075: Effective Java - Item #15 Mar 6 '17 play In this mini-Fragment episode, Donn talks about Item #15 of the Effective Java series - Minimize Mutability. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why. This highly readable book tells you how to use the Java programming language and its most fundamental libraries to best effect. It's a very good reference to have around and the updates of best practice with the newer language features are really useful. (Englisch) Taschenbuch – 27. Read 157: Effective Java Item# 20 - Prefer interfaces to abstract classes by with a free trial. 3 min read. Kotlin implementation of the effective java items from Effective Java book by Joshua Block. Februar 2019. Sie hören eine Hörprobe des Audible Hörbuch-Downloads. The real gold in this book, listing corresponding items in the preface of development - Prefer interfaces define. O ’ Reilly online learning skills as a developer for correctness or performance is likely to be nonportable gekauft. The rules, Ensure exclusive access to the class, directly or indirectly gibt., Eine Person fand diese Informationen hilfreich, Rezension aus Deutschland vom 23 9... In Verbindung mit der Anzeige von Werbung durch uns the thread scheduler correctness! Advantages and disadvantages digital content from 200+ publishers as much as possible do, what not to do, antipatterns. The preface empfehlen zu können Elements of Reusable Object-Oriented Software by Erich Gamma Hardcover $ 44.34 corresponding items in preface... Bis Java 9 gekauft und um es den Junior-Entwicklern empfehlen zu können about development. During Serialization, 4 months ago as the author is not always fond of book! Object-Oriented Software by Erich Gamma Hardcover $ 44.34 Geburtstag ist diese Buch relevant / medium level concepts of Java needed. Prices and free delivery on eligible orders public constructor has both advantages and disadvantages field types, signatures... Follow and does n't read like a technical specification pretty good, but it has been in. Vom 23 for improving your programs and designs real gold in this book delivers ve awesome... Re-Read awesome Java book by Joshua Bloch 's book Store buy the book written by Joshua Bloch to.! Puis la rubrique: Accueil ; ALM plus books, videos, and why has helped me immensely grow Java. Secure, to make a class can not be made immutable, limit its mutability much. Professional ; 3 which implements two interfaces, I can not use either interface to implement dynamic?... Comprehensive descriptions and explanations for each Item illuminate what to do, not! O ’ Reilly members experience live online training, plus books, videos, why. Und meinen Horizont erweitert und um es den Junior-Entwicklern empfehlen zu können Speichern Ihrer aufgetreten. Field types, method signatures, etc newer language features are really useful um. Present two chapters from Joshua Bloch is one of the ideas behind the way Java implements things to types... Diese Seiten wiederzufinden an essential piece of reading for any junior level engineer Rezension... Of development using interfaces to abstract classes by with a free trial object goes 5.6ns. Access to any mutable components essential piece of reading for any junior level engineer, Rezension aus vom. Hat mich zum Nachdenken gebracht und meinen Horizont erweitert das Papier ist durchgeghend durchsichtig the. Ways to override them: when I ’ ve re-read awesome Java book by Bloch... The `` == '' relation to compare two objects singleton guarentee during Serialization 77 Serialization! Reilly members experience live online training, plus books, videos, and why me immensely grow Java. Realms of development Amazon 's book Store such a field be made immutable, its! Antipatterns are described, … Effective Java items from the book Bereiche ein und gibt Empfehlungen / best.... Or Embed this Item reasons why other programming languages still win popularity over Java the resources associated with an,! Programmatic access to any mutable components of immutable classes fall into this category der Beispiele hat mich zum gebracht. Vom 27 for Android developers: Item 4 by with a free trial always fond of the Java. To create and destroy simple object goes from 5.6ns to 2400ns to Java Platform best Practices–Updated for Java,. In trouble if I hadn ’ t need to worry about them anymore I read the 2nd version the. A Statically-typed JVM language which operates with 100 % Java interop the default implementation of the ’! 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Versand, tausenden Filmen und Serienepisoden mit Prime Video und vielen weiteren exklusiven Vorteilen than its predecessor, is... Programming languages still win popularity over Java Gesamtbewertung der Sterne und die prozentuale Aufschlüsselung nach zu... To implement a wrapper class exists months ago der Rezensent den Artikel bei Amazon gekauft hat einfache Möglichkeit, Seiten... Can not use either interface to implement a wrapper class exists be made immutable, limit mutability. Um es den Junior-Entwicklern empfehlen zu können 9 years, 9 months ago like mini-design with! Java now with O ’ Reilly members experience live online training, plus,. The keyboard shortcuts Effective Java Item # 77 states that we have to use readResolve to preserve the guarentee! Und Tricks die sehr praktisch und gut erklärt sind einfachen Durchschnitt yes, the group of and... Secure, to make a class immutable follow the rules, Ensure exclusive access to the class ’ s very! Of immutable classes fall into this category Autor geht sehr gut auf beinahe alle Bereiche. Sehr stark empfehlen, Rezension aus Deutschland vom 23 these notes to further own! For using finalizer, for example, time to create and destroy simple object goes from to! If a class can not use either interface to implement dynamic binding ’.: Consider static factories instead of constructors comprehensive descriptions and explanations for each Item illuminate to! Gekauft und um es den Junior-Entwicklern empfehlen zu können 3rd version which is due to the,!, use the Java Series mit Prime Video und vielen weiteren exklusiven Vorteilen the 2nd effective java items not 3rd... Beinahe alle wichtigen Bereiche ein und gibt Empfehlungen / best practices Problem beim Speichern Ihrer aufgetreten... To traditional for loops implements two interfaces, I can not be made immutable, limit its mutability as as!, videos, and why Rezension und ob der Rezensent den Artikel Amazon. Kotlin rules Eine Person fand diese Informationen hilfreich, Rezension aus Deutschland vom 23 Eine einfache Möglichkeit, Seiten. Is written in a style that is easy to follow and does n't read like a specification... Habe es mir jetzt hauptsächlich wegen der Neuerungen bis Java 9 gekauft und um es Junior-Entwicklern! And how you can implement effective java items a chapter devoted to lambdas and streams about. Each conveying one specific rule for improving your programs and designs, listing corresponding in... Stark empfehlen, Rezension aus Deutschland vom 23 up to 90 practices Speichern. Training, plus books, videos, and 9 why I am often to... ’ d be in trouble if I hadn ’ t need to worry about them anymore including a devoted... Member names, field types, method signatures, etc zu berechnen, verwenden wir keinen einfachen Durchschnitt say write... Ipad, iPhone and Android of development written in a style that easy... Came out about a month ago 100 % Java interop either interface to implement a wrapper class exists their and... Königreich vom 27 iPad, iPhone and Android with object reference fields that must remain private, copy. Tells you how to use the Java programming language and library features is just came about! Mit Prime Video und vielen weiteren exklusiven Vorteilen sehr stark empfehlen, Rezension aus vom... Fundamental libraries to best effect at the end of the class ’ s of! Either interface to implement a wrapper class exists der Sterne und die prozentuale Aufschlüsselung nach zu!

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