Main.kt

/**
output:

main run in [ main ]
fetchData run in [ DefaultDispatcher-worker-1 ]
runApplication run in [ main ] result: [ Hello Coroutine ]
*/
import kotlinx.coroutines.*

fun main() = runBlocking {
    println("main run in [ ${Thread.currentThread().name} ]")
    runApplication()
}

suspend fun runApplication() {
    val result = fetchData()
    println("runApplication run in [ ${Thread.currentThread().name} ] result: [ $result ]")
}

suspend fun fetchData() = withContext(Dispatchers.Default) {
    delay(1_000)
    println("fetchData run in [ ${Thread.currentThread().name} ]")
    return@withContext "Hello Coroutine"
}