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| trait Speaker { | |
| def speak(): String | |
| } | |
| trait TailWagger { | |
| def startTail(): Unit | |
| def stopTail(): Unit | |
| } | |
| trait Runner { |
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| sealed trait Topping | |
| case object Cheese extends Topping | |
| case object Pepperoni extends Topping | |
| case object Mushrooms extends Topping | |
| case object Onions extends Topping | |
| sealed trait CrustSize | |
| case object SmallCrustSize extends CrustSize | |
| case object MediumCrustSize extends CrustSize | |
| case object LargeCrustSize extends CrustSize |