Can Actors in Scala fail to process messages? (example in O'Reilly's Programming Scala)

Question

I\'m completely new to Scala, and I\'ve been working my way through Programming Scala (O\'Reilly) online; while doing so, I was surprised by the result of the

Answer 1

Simple solution, add this to the end of shapes-actor-script.scala:

Thread.sleep(1000)

It'll give the actor time to print all the various Shape messages before the REPL terminates.