GIGO: words unreadable aloud

Chapter 7, Exercise 13

Exercise 13: Following the example in Transmogrify.java, create a Starship class containing an AlertStatus reference that can indicate three different states. Include methods to change the states.

package x; 
abstract class AlertStatus { def Alert : Unit; }
class RedAlert extends AlertStatus { def Alert = W.rn( "Carnation" ); }
class OrangeAlert extends AlertStatus { def Alert = W.rn( "Navel" ); }
class YellowAlert extends AlertStatus { def Alert = W.rn( "Goldenrod" ); }
class Starship {
    var buzz : AlertStatus = new YellowAlert;
    def cryWolf = { buzz = new OrangeAlert; }
    def cryBlitzer = { buzz = new RedAlert; }
    def lookAlert = buzz.Alert;
}
object c7xH {
    def main ( args: Array[String] ) = {
        var quark = new Starship;
        quark.lookAlert;
        quark.cryWolf;
        quark.lookAlert;
        quark.cryBlitzer;
        quark.lookAlert; 
    }
}

I suppose that idiomatic Scala would use an algebraic type (a.k.a. a few case classes) here, instead of the more purely object oriented approach seen here.
1:45:47 AM comment/