kotlin - 为什么 Kotlin 的代码可以直接从 “kotlin.collections” 调用顶层函数，不需要导入包

Question

为什么 Kotlin 的代码可以直接从“kotlin.collections”中调用顶层函数，而无需导入包。例如下面的函数listOf :

data class Person1(val name: String, val age: Int)

class DataClassExecutor {
  ... ...
  fun test(arg: String?): String? {
    val persons = listOf(
        Person1("Lucy", age = 26), 
        Person1("Lily", age = 29))
    ... ...
  }
}

Answer 1

请引用此页面:https://kotlinlang.org/spec/packages-and-imports.html .它说:

There are some packages which have all their entities implicitly imported into any Kotlin file, meaning one can access such entity without explicitly using import directives.

该列表包括 kotlin.collections .
这类似于 Java 中的方式，java.lang是隐式导入的。在Java中不用说java.lang.System.out.println , 只是 System.out.println足够。