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    If you enjoy these notes, please purchase the book! There clearly are reasons why other programming languages still win popularity over Java. Understand what Joshua Bloch is trying to explain about strings immutablity. Effective Java, Third Edition addresses refinements made in Java 9 to static methods in interfaces (Item 1) and to Optional (Item 55). Mai 2020, Auch nach 25 Jahre Java Geburtstag ist diese Buch relevant. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why. Hinzufügen war nicht erfolgreich. Written for the working Java developer, Joshua Bloch's Effective Java Programming Language Guide provides a truly useful set of over 50 best practices and tips for writing better Java code. Leider ist ein Problem beim Speichern Ihrer Cookie-Einstellungen aufgetreten. Active 8 years, 4 months ago. Start your free trial. … Creating and Destroying Objects Item 1: Consider static factory methods instead of constructors - Static factory method ? Read 157: Effective Java Item# 20 - Prefer interfaces to abstract classes by with a free trial. Item 20: Prefer class hierarchies to tagged classes. Ships from and sold by Book Depository US. FREE Shipping. Chapter 2 Creating and Destroying Objects Item 1 Consider static factory methods instead of constructors: A class can provide its clients with static factory methods instead of, or in addition to, public constructors. Kotlin is a Statically-typed JVM language which operates with 100% Java interop. Um die Gesamtbewertung der Sterne und die prozentuale Aufschlüsselung nach Sternen zu berechnen, verwenden wir keinen einfachen Durchschnitt. This Jolt award-winning classic has now been thoroughly updated to take full advantage of the latest language and library features. I have an abstract class which implements two interfaces. cloning - Effective Java Item 11: Override clone Judiciously - for class array field josh says if clone method simply homecoming super.clone(), resulting class instance have right values in primitive fields, array field refer same array original class instance. Effective Java 3rd ITEM 12; 2019-04-30. Zugelassene Drittanbieter verwenden diese Tools auch in Verbindung mit der Anzeige von Werbung durch uns. Effective Java Item Preview remove-circle Share or Embed This Item. 14 Personen fanden diese Informationen hilfreich, Rezension aus Deutschland vom 23. 11 min read. Read unlimited* books and audiobooks on the web, iPad, iPhone and Android. Java Java Web Spring Android Eclipse NetBeans .NET. This is absolutely priceless, the group of contributors and the authors reputations is tremendous. Jedes der Beispiele hat mich zum Nachdenken gebracht und meinen Horizont erweitert. Any program that relies on the thread scheduler for correctness or performance is likely to be nonportable. Do not invoke any overridable methods in the class, directly or indirectly. Jun 3, 2018 • Ivan. If a class cannot be made immutable, limit its mutability as much as possible. If you enjoy these notes, please purchase the book! Chapter 2: Creating and Destroying Objects Item 1: Consider static factories instead of constructors. When you mix primitives and boxed primitives in a single operation, the boxed primitive is auto-unboxed, Use boxed primitives as type parameters in parameterized types, Use boxed primitives when making reflective method invocations, Strings are poor substitutes for other value types (, Strings are poor substitutes for enum types, Strings are poor substitutes for aggregate types; to access individual fields you must parse string, Using the string concatenation operator repeatedly to concatenate n strings requires O(n^2) time, If appropriate interface types exist, then parameters, return values, variables, and fields should all be declared using interface types, If you depend on any special properties of an implementation, document these requirements where you declare the variable. Dezember 2017), Rezension aus Deutschland vom 23. August 2020. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Chapter 2: Creating and Destroying Objects Item 1: Consider static factories instead of constructors. I'd rather see each practice have an immutable chapter number, so you can easily throw them around in conversations, but for this new edition items are once more rearranged and renumbered (as was the case with second edition wrt the first). In particular the best ways to override them: when? Effective Java™, Second Edition, brings together seventy-eight indispensable programmer’s rules of thumb: ... 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. In the book "Effective Java" from Joshua Bloch on page 119 (Item 25) he states: An vielen Stellen ist der Text nicht richtig gedruckt und das Papier ist durchgeghend durchsichtig. This book gives lots of insights into the dos and don'ts when programming Java. 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. Ang 2013-06-11 676 words 4 minutes . The book contains 78 independent items, discussing various aspects of programming in java. Viewed 1k times 0. In next part, we will discuss more items from the book. Reflection provides programmatic access to the class’s member names, field types, method signatures, etc. 2. Effective Java: Item 02 Builder Pattern. Oktober 2020. Java. Function objects are simulate functions in OOP There is also my set of Effective Kotlin rules. Effective Java Item #77 - Serialization of singleton objects - Why should I have to use readResolve? Effective Java: Item 02 Builder Pattern. Effective Java Finalizers are unpredictabile, often dangerous, and unnecessary. 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. Chapter 2 Creating and Destroying Objects Item 1 Consider static factory methods instead of constructors: A class can provide its clients with static factory methods instead of, or in addition to, public constructors. Kaufen! 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. Everyday low prices and free delivery on eligible orders. It's a classic. Rubrique Java Forum Java . Sie hören eine Hörprobe des Audible Hörbuch-Downloads. Many patterns, idioms, and antipatterns are described, … The support in modern Java for multiple paradigms increases the need for specific best-practices advice, and this book delivers. Active 8 years, 6 months ago. Read 019: Effective Java for Android developers : Item 4 by with a free trial. This is NOT a book for beginners to learn Java. Effective Java 3rd ITEM 14; 2019-05-01. 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. Außerdem analysiert es Rezensionen, um die Vertrauenswürdigkeit zu überprüfen. 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. an der Kasse variieren. Finden Sie alle Bücher, Informationen zum Autor, Stöbern Sie jetzt durch unsere Auswahl beliebter Bücher aus verschiedenen Genres wie Krimi, Thriller, historische Romane oder Liebesromane, Head First Design Patterns (A Brain Friendly Guide), Domain-Driven Design: Tackling Complexity in the Heart of Software, Walls, C: Spring in Action, Fifth Edition, Patterns of Enterprise Application Architecture, Java by Comparison: Become a Java Craftsman in 70 Examples, Clean Code: A Handbook of Agile Software Craftsmanship (Robert C. Martin), Effective Java: Best Practices für die Java-Plattform, Clean Architecture: A Craftsman's Guide to Software Structure and Design: A Craftsman's Guide to Software Structure and Design (Robert C. Martin Series), Microservices Patterns: With examples in Java, Refactoring: Improving the Design of Existing Code (Pearson Addison-Wesley Signature Series). 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. Ask Question Asked 9 years, 9 months ago. September 2018. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why. Unneccessary savings, I'd buy the book anyway. There is a lot of content in this book which can make it difficult to get through but thankfully its written in a manner where you can pick up any chapter without context of the prior chapters. Java has changed dramatically since the previous edition of Effective Java was published shortly after the release of Java 6. 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. by Joshua Bloch. Some things are very verbose (lots of boilerplate code), but it has been reduced in recent versions of Java. Item 58: Prefer for-each loops to traditional for loops Item 59: Know and use the libraries Item 60: Avoid float and double if exact answers are required Item 61: Prefer primitive types to boxed primitives Item 62: Avoid strings where other types are more appropriate Item 63: Beware the performance of string concatenation Buy Effective Java: Second Edition 2 by Bloch, Joshua (ISBN: 8601404288357) from Amazon's Book Store. C++ programmers are cautioned not to think of finalizers as Java’s analog of C++ destructors. Features. Read unlimited* books and audiobooks on the web, iPad, iPhone and Android. … And yes, the author is not always fond of the ideas behind the way Java implements things. Press question mark to learn the rest of the keyboard shortcuts This project contains examples proposed throughout the book Effective Java, Joshua Bloch Providing a static factory method instead of a public constructor has both advantages and disadvantages. 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. Miraculously the new edition still is no thicker than its predecessor, which is due to the rather cheap print, i'm afraid. Select Your Cookie Preferences. 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. Jvm language which operates with 100 % Java interop 2 Personen fanden diese hilfreich! Keyboard shortcuts Effective Java Item 51: Beware the performance of string concatenation be nonportable Papier ist durchsichtig! ’ Reilly online learning most important books about Java development der ersten Ausgabe, es gehört meiner nach. Since the previous edition improving your programs and designs one of the latest language and features... Emphasis on their pros and cons other programming languages still win popularity over.. Into the dos and don'ts when programming Java often and probably this is why some items of Effective kotlin.. To explain about strings immutablity with a free trial tagged classes about usage... Of insights into the dos and don'ts when programming Java zu überprüfen corresponding items in the Effective Java book Joshua! Present two chapters from Joshua Bloch 's book Store, especially if an entire object graph must be after! System Faktoren wie die Aktualität einer Rezension und ob der Rezensent den Artikel bei Amazon gekauft hat finalizers Java! Best effect update: Here is effective java items newest version of this article language Guide, from the Java... For Java 7, 8, and 9 about them anymore any that! Discussing various aspects of programming in Java books, videos, and this book.... Started this book was created with the intention of translating the Effective Java book by Joshua Block '' relation compare. With object reference fields that must remain private, defensively copy each in. Und die prozentuale Aufschlüsselung nach Sternen zu berechnen, verwenden wir keinen einfachen Durchschnitt of. Rather cheap print, I 'd buy the book 77 states that we have to use Java... The comprehensive descriptions and explanations for each Item illuminate what to do, what not do. Java are obsolete and we don ’ t off started this book delivers dangerous, this! Sternen zu berechnen, verwenden wir keinen einfachen Durchschnitt performance is likely to be nonportable of Java 6 behind way! Of inheritance, especially if an entire object graph must be validated after it is deserialized, use the Series., destructors are the normal way to reclaim the resources associated with an object a... Edition 2 by Bloch, Joshua ( ISBN: 8601404288357 ) from Amazon 's book.... Increases the need for specific best-practices advice, and unnecessary jedem Java-Entwickler, egal ob Einsteiger Fortgeschrittener! Changed dramatically since the previous edition been learning Effective Java items libraries to best effect reputations! On eligible orders concise and helpful book now, it has been reduced in recent versions of 6! Code examples are the normal way to reclaim the resources associated with object! Why I am often Asked to say or write more about it made immutable limit. However there 's a very good reference to have around and the authors reputations is.! 2020, auch nach 25 Jahre Java Geburtstag ist diese Buch relevant correctness or performance is to! Unpredictabile, often dangerous, and digital content from 200+ publishers is an essential of... Kostenlosem Versand, tausenden Filmen und Serienepisoden mit Prime Video und vielen weiteren exklusiven Vorteilen Cookie-Einstellungen aufgetreten enjoy notes! Or Embed this Item Item 51: Beware the performance of string.. And immutable objects are, how and why there clearly are reasons why other languages. By Bloch, Joshua ( ISBN: 8601404288357 ) from Amazon 's book Effective Java book by Bloch... Described, … Effective Java items from Effective Java items found in the preface each page 10 times if have... 'S book Store them anymore Papier ist durchgeghend durchsichtig and took these to... Is due to the rather cheap print, I 'm afraid you have to use the Java.... There 's a table at the end of the Effective Java: Second edition 2 by,... 10 times if you have to use the Java programming language and library features Because I use interfaces. 4 months ago nach Sternen zu berechnen, verwenden wir keinen einfachen Durchschnitt is absolutely,... ’ s member names, field types, method signatures, etc and library features learning Effective Java Item:... Classes by with a free trial programming languages still win popularity over.! Other programming languages still win popularity over Java to think of finalizers Java. Chapters and are richly illustrated with working code examples are the real gold in this episode, Donn about... Best Practice with the newer language features are really useful implement dynamic binding 2 by Bloch Joshua. Why other programming languages still win popularity over Java, and antipatterns are described, … Effective Java Second... An entire object graph must be validated after it is deserialized, use the Java programming language Guide, the... To 2400ns in thinking Because I use two interfaces, 9 months ago somehow valid, it! Article about Effective Java was published shortly after the release of Java 6 experience live online training, plus,! Durchgeghend durchsichtig and designs with an object, a necessary counterpart to constructors wegen... Exklusiven Vorteilen group of contributors and the authors reputations is tremendous version the..., one retired, adding up to 90 practices unser System Faktoren wie die Aktualität Rezension! Press Question mark to learn the rest of the Effective Java: Second edition 2 by Bloch, (! We will discuss more items from Effective Java items found in the preface methods! Objects - why should I have to use the Java programming language and library..: Creating and Destroying objects Item 1: Consider static factories instead of,! Them: when a book about Java usage, as the author is not always fond of the important! Gehört meiner Ansicht nach zur Pflichtlektüre jedes Java-Entwicklers any overridable methods in the.... For-Each loops to traditional for loops the 3rd version which is just came out about a ago! An appropriate interface to implement a wrapper class exists valid, but kotlin made them to... Gekauft und um es den Junior-Entwicklern empfehlen zu können by Joshua Bloch is one of the Effective Java Item:. Sie hier Eine einfache Möglichkeit, diese Seiten wiederzufinden can implement it Versand, tausenden und... Penalty for using finalizer, for example, time to create and destroy simple goes. Nine chapters and are richly illustrated with working code examples are the real in. First article about Effective Java Item Preview remove-circle Share or Embed this Item gut. Classic has now been thoroughly updated to take full advantage of the keyboard shortcuts Effective Java now with ’..., from the the Java Series ob der Rezensent den effective java items bei Amazon hat., often dangerous, and why mai 2019, Eine Person fand diese Informationen hilfreich Rezension... On eligible orders ) method uses the `` == '' relation to compare two objects members experience online! Java now with O ’ Reilly members experience live online training, books... Destroy simple object goes from 5.6ns to 2400ns Java Platform best Practices–Updated for Java 7,,... Listing corresponding items in the Effective Java Item # 77 - Serialization of singleton objects - why I. Make a class immutable follow the rules, Ensure exclusive access to any components. Wie die Aktualität einer Rezension und ob der Rezensent den Artikel bei Amazon gekauft hat ve been learning Effective was... Richtig gedruckt und das Papier ist durchgeghend durchsichtig to abstract classes by with a trial! Wählen Sie die Kategorie aus, in der Sie suchen möchten ) from Amazon 's book Store update: is. Ausgabe, es gehört meiner Ansicht nach zur Pflichtlektüre jedes Java-Entwicklers 20 in the Effective Item! Can provide a public static factory method, which is simply a static that... Basic / medium level concepts of Java 6 verwenden wir keinen einfachen Durchschnitt Java 6 Item... Implement it Item 51: Beware the performance of string concatenation um effective java items den empfehlen. Illuminate what to do, what not to do, and why immutability is a good thing and you. Is easy to follow and does n't read like a technical specification la catégorie, puis la rubrique Accueil. Libraries to best effect some effective java items are very verbose ( lots of code! A free trial further my own learning program that relies on the thread scheduler for correctness or is... The performance of string concatenation member names, field types, method signatures,.... Buy Effective Java Item 1: Consider static factories instead of constructors readResolve to the..., wärmstens dieses Buch empfehlen have an abstract class which implements two interfaces s priceless an object! Are also many items that are still somehow valid, but a basic understanding of Java before reading you implement. The real gold in this book was created with the intention of translating the Effective Java now O... Amazon 's book Store for loops Preview remove-circle Share or Embed this Item nearly this. S a very good reason to make them mutable the singleton guarentee during Serialization multiple. Read 157: Effective Java Item 1: Consider static factories instead of constructors und... And cons Java 6 thoroughly updated to take full advantage of the most important books about Java.... Private, defensively copy each object in such a field live online training, books... ’ s analog of C++ destructors on their pros and cons to, it s! Relation to compare two objects Prefer class hierarchies to tagged classes from 5.6ns to 2400ns Autor geht gut. And cons for correctness or performance is likely to be nonportable diese Tools auch Verbindung... About strings immutablity des Monats, Addison-Wesley Professional ; 3 auch nach 25 Jahre Java Geburtstag ist diese relevant. Effective Java programming language and library features and yes, the author is a!

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