object 匹配样例类 {

  case class Customer(name: String, age: Int)

  case class Order(id: Int)

  def main(args: Array[String]): Unit = {

    // val a: Any = Customer("张三", 10)
    // val a: Any = Order(1)
    val a: Any = null

    a match {
      case Customer(a, b) => println(s"Customer{name = ${a}, age = $b}")
      case Order(id) => println(s"Order{id = $id}")
      case _ => println("未匹配")
    }

  }

}