kotlin 基础

async

https://kotlinlang.org/docs/coroutines-and-channels.html#task-5

 coroutineScope {
            async {
                delay(1000)
            }
            async {
                delay(1000)
            }
        }

kotlin lombok

https://kotlinlang.org/docs/lombok.html#using-with-kapt

kotlin for循环

println(4 in 1..4)