learning scala akka actorySystem create and close

package com.example

import akka.actor.ActorSystem

import scala.util.{Failure, Success}
import scala.concurrent.ExecutionContext.Implicits.global
object Tutorial_01_ActorSystem_Introduction extends  App {
  println("Step1 : Create an actor system")
  val system = ActorSystem("DonutStoreActorSystem")

  println("
Step 2: close the actor system")
  val isTerminated =  system.terminate()

  println("
Step3： Check the status of the actory system")
  isTerminated.onComplete {
    case Success(result) => println("Success terminate")
    case Failure(e) => println("Failed to terminate");
  }

  Thread.sleep(5000)

}

result：

Step1 : Create an actor system

Step 2: close the actor system

Step3： Check the status of the actory system
Success terminate