scala的继承

package com.test.scala.test

/**
 * 模拟java的继承，扩展类
 */
abstract class ExtendClass(val des:String) {
  def undo():String
  def redo():String
}

object DoNothingAction extends ExtendClass("do nothing"){
   override def undo:String={"I don't know how!"}
   override def redo:String={"aaa"}
}

object test{
  def main(args: Array[String]): Unit = {
    val actions=Map("hello"->DoNothingAction,"go"->DoNothingAction);
    for((k,v)<-actions)println(k+"->"+v.redo())
  }
}

package com.test.scala.test

/**
 * 继承类学习
 */
class ExtendClassStudent {

  final def add(a:Int,b:Int):Int={a+b}
  def aa(bb:String):String={bb}
}

class Zilei extends ExtendClassStudent{
  override def aa(bb:String):String={bb}
}