Scala sample object

// Sample object 
// stay Scala in , use case Decorated singleton objects are called sample objects , And it has no main constructor 
// It is mainly used in two places 
//1. Use as enum value 
//2. As a message passing without any parameters 
object  Sample object  {
    

  trait Sex

  case object Male extends Sex

  case object Female extends Sex

  case class Person(var name: String, var sex: Sex) {
    }

  def main(args: Array[String]): Unit = {
    
    val p = Person(" Zhang San ", Male)
    println(p)
  }

}