In Java the java.lang package is imported by default.
In kotlin a number of functions and classes are available without being imported, like println and kotlins Array, Int, etc types.
What else is imported by default and where is it defined?
Kotlin stdlib有kotlin个根包和(see the full list with the content)个子包.
It seems not to be documented anywhere which of them are imported by default, but a peek into Kotlin Github sources suggests that these packages are imported for JVM target platform:
java.lang.*kotlin.*个kotlin.annotation.*kotlin.jvm.*kotlin.collections.*kotlin.ranges.*kotlin.sequences.*kotlin.text.*kotlin.io.*kotlin.coroutines.* (to be added in Kotlin 1.1, not present in 1.0.4)我已经手动测试了它们，上面的列表适用于Kotlin 1.0.4.默认情况下，这些stdlib包是not个导入的:
kotlin.comparisons.*kotlin.concurrent.*kotlin.properties.*kotlin.reflect.*kotlin.reflect.jvm.*kotlin.system.*正如@Magnus所指出的，JS平台are different的默认导入.