scala - Scala 中的 Akka，感叹号和问号

Question

向 Actor 发送消息时，感叹号 (!) 和问号 (?) 有什么区别？

myActor ! Hello(value1)
myActor ? Hello(value1)

Answer 1

无耻地复制[太棒了] official doc (查看发送消息部分了解更多信息):

Messages are sent to an Actor through one of the following methods.

! means “fire-and-forget”, e.g. send a message asynchronously and return immediately. Also known as tell.

? sends a message asynchronously and returns a Future representing a possible reply. Also known as ask.