coroutine_statemachine.kt

fun delay(delayTime: Long, stateMachine: StateMachine) {
    Thread.sleep(delayTime)
    stateMachine.resume()
}

class StateMachine {
    var state = 0
    var start = 0L
    fun resume() {
        when (state) {
            0 -> {
                start = System.currentTimeMillis()
                state++
                println("start")
                delay(1000L, this)
            }
            1 -> {
                state++
                println("end ${System.currentTimeMillis() - start}")
            }
        }
    }
}

fun main(args: Array<String>) {
  val stateMachine = StateMachine()
  stateMachine.resume()
}

simple_coroutine.kt

import kotlinx.coroutines.experimental.delay
suspend fun simpleCoroutine() {
    val start = System.currentTimeMillis()
    println("start")
    delay(1000)
    println("end ${System.currentTimeMillis() - start}")
}

You can run on try kotlin.
https://try.kotlinlang.org/