“::"是什么?在 kotlin 中是什么意思? [英] what does "::" mean in kotlin?
问题描述
我是 Kotlin 的新手
我使用此代码打开另一个活动:
startActivity(Intent(this,IntroAndLang::class.java))
当前活动和目标活动是用 Kotlin 编写的
我不明白为什么在 IntroAndLang::class.java
:
而不是 ::
如docs 这是一个类参考:
<块引用>类参考:最基本的反射功能是获取 Kotlin 类的运行时引用.要获取对静态已知 Kotlin 类的引用,您可以使用类文字语法:
val c = MyClass::class//引用是一个KClass类型的值.
<块引用>
请注意,Kotlin 类引用与 Java 类引用不同.要获取 Java 类引用,请使用 KClass 实例上的 .java 属性.
也是方法引用的语法,如这个简单的例子:
list.forEach(::println)
指的是在 Kotlin 标准库中定义的 println
.
I'm new to Kotlin
I used this code for opening another activity:
startActivity(Intent(this,IntroAndLang::class.java))
current activity and target activity are written in Kotlin
I cant understand why there is not single :
instead of ::
at IntroAndLang::class.java
As stated in the docs this is a class reference:
Class References: The most basic reflection feature is getting the runtime reference to a Kotlin class. To obtain the reference to a statically known Kotlin class, you can use the class literal syntax:
val c = MyClass::class
//The reference is a value of type KClass.
Note that a Kotlin class reference is not the same as a Java class reference. To obtain a Java class reference, use the .java property on a KClass instance.
It’s also the syntax for method references as in this simple example:
list.forEach(::println)
It refers to println
defined in Kotlin Standard library.
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