case class script

Ch15_1.scala

/**
 * Created by OTChen on 2015/5/19.
 */
object Ch15_1 extends App {

  println("parametric field access level")
  //val red = new RedBull(100)
  //red.energy

  val blue = new BlueBull(90)
  println("BlueBull energy: " + blue.energy)

  println("\nequality")
  val cats = (new Cat(20, true), new Cat(20, true))
  println("cats._1 == cats._2: " + (cats._1 == cats._2))

  val case_cats = (new CaseCat(20, true), new CaseCat(20, true))
  println("case_cats._1 == case_cats._2: " + (case_cats._1 == case_cats._2))

  println("\ntoString")
  val (cat, _) = cats
  val (case_cat, _) = case_cats

  println("cat: " + cat)
  println("case_cat: " + case_cat)

  println("\nconstructor pattern")
//  val getWeight = cat match {
//    case Cat(w, b) => w
//  }
//  println("getWeight: " + getWeight)

  val getCaseWeight = case_cat match {
    case CaseCat(w, b) => w
  }
  println("getCaseWeight: " + getCaseWeight)

  println("\nfactory method")
  //val another_cat = Cat(30, true)
  //println(another_cat)
  val another_cat = new Cat(30, true)

  val another_case_cat = CaseCat(30, true)
  println("another_case_cat: " + another_case_cat)


  val blackDog = BlackDog(100)
  val whiteDog = WhiteDog(90)
  def describeDog(dog: Dog): String = dog match {
    case BlackDog(h) => h + " height dog"
  }
  println(describeDog(blackDog))

}

class RedBull(energy: Int)
case class BlueBull(energy: Int)

class Cat(val weight: Int, val isBlack: Boolean)
case class CaseCat(val weight: Int, val isBlack: Boolean)

abstract class Dog {
  def color: String
}
case class BlackDog(height: Int) extends Dog { override def color = "black"}
case class WhiteDog(height: Int) extends Dog { override def color = "white"}

scalac Ch15_1.scala
scala Ch15_1