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cancel() Job을 취소시키는 함수, Job이 취소되었을 때 suspend 함수를 호출하면 JobCancellationException을 발생시킨다. fun main() = runBlocking { val job = launch { repeat(5) { try { delay(1000L) println("Job Run Index($it)") } catch (e: Exception) { e.printStackTrace() } } } delay(3000L) job.cancel() job.join() } Job Run Index(0) Job Run Index(1) kotlinx.coroutines.JobCancellationException: StandaloneCoroutine was cancelled; ..