密封接口(sealed interface)是kotlin 1.5引入的一个新特性,它可以让我们定义一个限制性的类层次结构,也就是说,我们可以在编译时就知道一个密封接口有哪些可能的子类型。这样,我们就可以更好地控制继承关系,避免出现意外的子类型。 密封接口与密封类(sealed class)类似,都可以用来表示一组有限的可能性。但是,密封类只能有一个实例,
事实上在早期版本中,只允许在 sealed class 内部或定义的同文件内扩展子类,这些限制在 Kotlin 1.5 中被逐步放开。 如果在不同 module 或 package 中扩展子类的话,IDE 会显示如下的提示和编译错误: Inheritor of sealed class or interface declared in package xxx but it must be in package xxx where base cl...
android,Android Resources,Clean code,Kotlin,Sealed Interface Photo by Natasya Chen on Unsplash In the domain of Android development, the pursuit of efficiency and robustness requires leveraging advanced language features and architectural best practices. Kotlin’s sealed interfaces emerge as a critical too...
事实上在早期版本中,只允许在 sealed class 内部或定义的同文件内扩展子类,这些限制在 Kotlin 1.5 中被逐步放开。 如果在不同 module 或 package 中扩展子类的话,IDE 会显示如下的提示和编译错误: Inheritor of sealed class or interface declared in package ...
But what's the benefit over defining a normal interface? Remember that you can define subclasses of sealed classes and interfaces only in the same Kotlin module. This limits the scope where these hierarchies can be extended (i.e. in the same module) and therefore limits the misuse surface. ...
You can define asealedinterface in Kotlin as follows: sealedinterfaceMenu Then, you can use it as below: sealedinterfaceMenu{dataclassPIZZA(val name:String,val size:String,val quantity:Int):MenudataclassBURGER(val quantity:Int,val size:String):MenudataclassCHICKEN(val quantity:Int,val pieces:Str...
Kotlin 语法:Interface 和 委托以及 sealed class 本文适合有 java 基础的同学,有学习 kotlin 的同学欢迎一起来,有问题可在文末留言。 场景描述 现在有一个项目需要外包出去,于是就找了中间人,负责将项目外包并按期交付,而这个中间人就获得了第一个项目报价,而中间人又不会写代码,于是,他去找了程序员,给出了...
As of Kotlin 1.5, interfaces can also have thesealedmodifier,which works on interfaces in the same way it works on classes: all implementations of a sealed interface should be known at compile time. One of the advantages of sealed interfaces over sealed classes is the ability to inherit from...
Sealed Classes 用于表示层级关系:子类可以是任意的类, 数据类、Kotlin 对象、普通的类,甚至也可以是另一个 Sealed Sealed Classes 受限制:必须在同一文件中,或者在 Sealed Classes 类的内部中使用,在Kotlin 1.1 之前,规则更加严格,子类只能在 Sealed Classes 类的内部中使用 ...
errors from IDEA when you try to implement it in Java. Moreover, if somebody finds it to be a serious problem that compiling the code via javac that tries to extend a Kotlin sealed interface does not produce any error, then we can provide a javac processor for this check in the ...