scala 提取器

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) //调用apply 工厂方法 构造出类的实例对象  val DataWarehouse(name ,age) = dw //调用unapply 方法 dw 实例中的name age  提取出来  println(name + "  " + age)  //相当于  dw match {    case DataWarehouse(name :String ,age :Int) =>println("1 :::" +name + "  " + age)  }//  val DWCode(tablename ,ages) = DWCode("rmt_stage",12)// 此处用到了  apply 方法   println(tablename + "::" + ages)}// more exampleclass 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 提取器