Scala中的Akka，感叹号和问号 [英] Akka in Scala, exclamation mark and question mark
本文介绍了Scala中的Akka，感叹号和问号的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
向Actor发送消息时，感叹号(!)和问号(?)有什么区别?
What is the difference between exclamation mark (!) and question mark (?) when sending messages to Actors?
myActor ! Hello(value1)
myActor ? Hello(value1)
推荐答案
Shamelessly copied [awesome] official doc (look Send messages section for more):
通过以下方法之一将消息发送给Actor.
Messages are sent to an Actor through one of the following methods.
!的意思是一劳永逸"，例如异步发送消息，
立即返回.也称为tell.
! means "fire-and-forget", e.g. send a message asynchronously and
return immediately. Also known as tell.
?发送一条消息
异步返回Future表示可能的答复.
也称为ask.
? sends a message
asynchronously and returns a Future representing a possible reply.
Also known as ask.
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