Scala:在match语句后返回基类时访问case类字段

abstract class Animal
case class Dog(name: String) extends Animal
case class Cat(name: String) extends Animal

def printAnimalName(animal: Animal): Unit = {
  animal match {
    case Dog(name) => println(s"This is a dog named $name")
    case Cat(name) => println(s"This is a cat named $name")
    case _ => println("Unknown animal")
  }
}

val dog = Dog("Buddy")
val cat = Cat("Whiskers")

printAnimalName(dog) // 输出：This is a dog named Buddy
printAnimalName(cat) // 输出：This is a cat named Whiskers