Demonstrating usage of Future with Actors in Akka Java

ActorWithFutures.java

package com.lightbend.akka.sample;

import akka.actor.AbstractActor;
import akka.actor.ActorSystem;
import akka.dispatch.Futures;
import akka.dispatch.OnSuccess;
import scala.concurrent.Future;
import static akka.dispatch.Futures.future; //this import might be missing
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.Callable;

//don't import this
//import java.util.concurrent.Future;

public class ActorWithFuture extends AbstractActor {
    final ActorSystem system = ActorSystem.create("helloakka");
    ActorWithFuture(){
        Futures.future(() -> "hello", getContext().dispatcher());
    }

    @Override
    public Receive createReceive() {
        Future<List<String>> f = future(new Callable<List<String>>() {
            public List<String> call() {
                return Arrays.asList("Hello", "World!");
            }
        }, system.dispatcher());

        f.onSuccess(new PrintResult<List<String>>(), system.dispatcher());
        return AbstractActor.emptyBehavior();
    }

    public final static class PrintResult<T> extends OnSuccess<T> {
        @Override public final void onSuccess(T t) {
            System.out.println(t);
        }
    }

}