1.package com.dt.scala.oop
2.trait Action {
3.  def doAction
4.}
5.trait TBeforeAfter extends Action {
6.  abstract override def doAction {
7.    println("Initialization")
8.    super.doAction //新建work时构造打印Working...
9.    println("Destroyed")
10. }
11.  }
12.     class Work extends Action{
13.     override def doAction = println("Working...")
14.   }
15.
16.  object UseTrait extends App{
17.   val work =new Work with TBeforeAfter
18.   work.doAction
19.  }