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※ Download: Kotlin in action на русском

Hands-on Design Patterns with Kotlin en The mission of this book is to ease the adoption of design patterns in Kotlin and provide good practices for programmers. An alternative that is used in many Smalltalk-derived languages, is to make classes themselves objects.

Hands-On Microservices with Kotlin en is a book by Juan Antonio Medina Iglesias which guides the reader in designing and implementing services, and producing production-ready, testable, lean code that's shorter and simpler than a traditional Java implementation. We have also included the latest information to introduce you to Spring framework 5. Or is there some other approach? Создадим-ка пустой Android-проект с одной Activity и Fragment внутри, и еще один простой дата-класс тоже не помешает.

Tag Info - Но вот, например, в таких языках, как D и Scala это описано. Да-да, нужно убедить заказчика купить нормальный Nexus-смартфон, и баги исчезнут!

Scala also replaces class level declarations with a 'Singleton' object. The main advantage of this is that everything is an object. In Java, static members are treated very differently than object members. This means that kotlin can't do things like implementing an interface or putting your class 'instance' into a map or pass it as a parameter to a method that takes Object. Companion objects allow for these kotlin />Citing from the Kotlin : Note that, even though the members of companion objects look like static members in other languages, at runtime those are still instance members of real objects, and can, for example, implement interfaces. Sounds very much to me like the Kotlin designers see this as an advantage over Java's static members. Moreover, the part about explains how companion objects can be used to create members which behave effectively like static members when annotated with JvmStatic. Kotlin is an object-oriented language. In an object-oriented action, something not being an object is an extremely crippling restriction. Classes aren't objects, but objects are objects duh! Another aspect is simplicity: why have two things, objects with instance members and classes with static members when you can just have objects with instance members? An alternative that is used in many Smalltalk-derived languages, is to make classes themselves objects. In Ruby, classes are instances of the Class class and yes, that means that Class is an instance of itself. I don't action why this design wasn't chosen in Java given its close to relation to Smalltalkbut it may have something to do with simplifying the type system note that most languages with classes-as-objects tend to be dynamic languages. I think it's at least arguable that Java does somewhat implement that pattern. For instance, if you have MyStaticClass with some static members, you can reference MyStaticClass. It's still true that the static members aren't actually attached to any object instance at русском conceptually; not sure what Java actually does under the covers. But it does mean that at least some of the limits raised in the accepted answer don't русском apply.

Урок 5. Kotlin. Добавление второго экрана в android-приложение
Отдельно стоит отметить, что фичи, затрагивающие сигнатуры методов, также распространяются и на обычные функции. For instance, if you have MyStaticClass with some static members, you can reference MyStaticClass. Какой он там по счету уже... Звучит довольно просто, вот только для этого тебе нужно хорошо знать английский язык. Если практика code review еще не используется у тебя на проекте, будь первым, кто о ней заговорит. Что плохого в том, что в одной версии языка не было фичи, а в следующей она появилась? This book is the first and currently only Kotlin book in Turkish. Так що переїзд на Котлін в n раз код не оптимізує хіба що він вміє інлайнити лямбди, тобто може бути профіт за рахунок того, що позбудемось від створення анонімних класів. Зачем же мне лямбды Java 1.