官网例子用的 sbt 
sbt 不太好用 ，改成 maven 


import akka.actor.{Actor, ActorSystem, Props}

class HelloActor extends Actor {
  def receive = {
    // case "hello"  => println("hello back to you.")
    case msg: String => println("msg=" + msg)
    case _ => println("what?")
  }
}

object Hello extends App {
  // actor need an ActorSystem
  val system = ActorSystem("HelloSystem")
  // create and start the actor
  val helloActor = system.actorOf(Props[HelloActor], name = "helloActor")
  // send two messages
  helloActor ! "hello"
  helloActor ! "what"
  helloActor ! "java"
  helloActor ! "scala"

  // shutdown the actor system
  system.terminate()
}



可以不继承 App   scala.App

object Hello2 {

  def main(args: Array[String]): Unit = {
    // actor need an ActorSystem
    val system = ActorSystem("HelloSystem")
    // create and start the actor
    val helloActor = system.actorOf(Props[Hello2Actor], name = "helloActor")
    // send two messages
    helloActor ! "hello"
    helloActor ! "java"
    helloActor ! "scala"
    helloActor ! "cpp"

    // shutdown the actor system
    system.terminate()
  }
}



完整代码
https://gitee.com/dyyx/hellocode/blob/master/demo/scala/akka/akka-quickstart-scala-maven/src/main/java/com/example/dyyx/hello/Hello.scala