Scala Extractor __scala

Package Com.xing.listfile

/**
  * Created by Dengni on 2017/2/15.
  * * Case

class Datawarehouse (name:string, Age:int)
object Extrctmethod extends app{

  val dw = Datawarehouse (" Spark ", 100)//Invoke the Apply factory method constructs the instance object of the class
  Val datawarehouse (name, age) = DW//Call unapply method The name age in the DW instance  extracts the

  pri  NTLN (name + "  " + Age)

  //equivalent
  to DW match {case
    datawarehouse (name:string, Age:int) =>println ("1:::" +name + "  " + Age)
  }


//
  Val Dwcode (tablename, ages) = Dwcode ("Rmt_stage", 12)//The Apply method is used here  
 PRINTLN (tablename + "::" + Ages)



}
//More Example
class Dwcode (Val tablename:string, Val age:int) 
 object  dwcode{

  def apply (tablename:string, age:int): Dwcode = new Dwcode (  tablename, age)

  def Unapply (Arg:dwcode): option[(String, Int)] = {

    Some (arg.tablename,arg.age)

  }

}

Scala Extractor