使用Java 8的Akka Essentials :返回第一个示例的结果

import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;
import akka.actor.UntypedAbstractActor;

public class FirstExample {
    public static void main(String[] args) {
        // 创建Actor系统
        ActorSystem system = ActorSystem.create("MySystem");

        // 创建一个Actor
        ActorRef actor = system.actorOf(Props.create(MyActor.class));

        // 发送消息给Actor
        actor.tell("Hello", ActorRef.noSender());

        // 关闭Actor系统
        system.terminate();
    }

    // 自定义的Actor类
    static class MyActor extends UntypedAbstractActor {
        @Override
        public void onReceive(Object message) throws Throwable {
            if (message instanceof String) {
                System.out.println("Received message: " + message);
            } else {
                unhandled(message);
            }
        }
    }
}