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



clientActor 向  serverActor 发送消息
serverActor 收到消息后 向 clientActor 回应消息



package com.example

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

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

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

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


object EchoTypedActorMain extends App {
  val serverActor: ActorSystem[EchoMsg] = ActorSystem(ServerActor(), "serverActor")
  val clientActor: ActorSystem[EchoMsg] = ActorSystem(ClientActor(), "clientActor")
  val list = List("hello", "akka", "typed", "actor")
  list.foreach { str =>
    serverActor ! EchoMsg(str, clientActor)
    println()
    Thread.sleep(1000)
  }

}



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


 akka actor demo 
 akka actor ask 模式 实例 
 akka typed actor 实例之hello