Classic Actors
https://doc.akka.io/docs/akka/current/actors.html

Akka Classic pertains to the original Actor APIs, which have been improved by more type safe and guided Actor APIs. 
Akka Classic is still fully supported and existing applications can continue to use the classic APIs. 
It is also possible to use the new Actor APIs together with classic actors in the same ActorSystem

typed actor 
https://doc.akka.io/docs/akka/current/typed/actors.html




package com.example

import akka.actor.typed.scaladsl.Behaviors
import akka.actor.typed.{ActorRef, ActorSystem, Behavior}

final case class Msg(msg: String, sender: ActorRef[Msg])

object HelloTypedActor {
  def apply(): Behavior[Msg] = Behaviors.receive { (context, message) =>
    println("receive msg " + message.msg + ",sender=" + message.sender + ",self=" + context.self)
    Behaviors.same
  }
}


object HelloActorMain extends App {
  val helloActor: ActorSystem[Msg] = ActorSystem(HelloTypedActor(), "helloTypedActor")
  helloActor ! Msg("hello", null)
  helloActor ! Msg("akka", null)
  helloActor ! Msg("typed", null)
  helloActor ! Msg("actor", null)
}



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


 akka actor demo 
 akka actor ask 模式 实例