第11节：scala面向接口编程

scala接口继承中第一个关键字一定是extends后面再出现接口要用with来实现接口
scala中有个抽象属性：未被实例化的属性，必须说明类型，如val name:String
scala对象的实例也可以混入接口，以扩展实例对象的功能
package com.dt.spark.scala.bascis

trait Logger{
  def log(message:String){
    println("Logger:  "+ message)
  }
}

trait aLogger extends Logger{
    println("a Logger:  " )
 override  def log(message:String){
    println("a Logger:  "+ message)
  }
}

trait bLogger extends Logger{
     println("b Logger:  " )
 override def log(message:String){
    println("b Logger:  "+ message)
  }
}

trait cLogger extends Logger{
    println("c Logger:  " )
 override  def log(message:String){
    println("c Logger:  "+ message)
  }
}

trait dLogger extends Logger{
     println("d Logger:  " )
 override  def log(message:String){
    println("d Logger:  "+ message)
  }
}

trait eLogger extends Logger{
    println("e Logger:  " )
 override  def log(message:String){
    println("e Logger:  "+ message)
  }
}

trait RichLogger extends Logger{
override  def log(message:String){
    println("RichLogger:  "+ message)
  }
}


trait information{
  def getInformation:String
  def checkIn:Boolean={
    getInformation.equals("Spark") 
  }
  println ("getInformation.equals Spark    " +checkIn)
}

class Passenger (val name: String){
    def getInformation=name
    println("getInformation:  " +getInformation )
}

class Loggin (val name:String) extends Logger{
  def loggin{
    println("Loggin name:  "+ name)
    log(name)
  }
  
  
}

object HelloTrait {
  def main(args: Array[String]): Unit = {
   
    new Loggin("DTspark").loggin
    
    val personLoggin  = new Loggin("Hello scala") with RichLogger  
    personLoggin.loggin
    
     val abcdeLoggin  = new Loggin("abcde") with aLogger with bLogger with cLogger  with dLogger with eLogger
    abcdeLoggin.loggin
    
    new Passenger("Spark").getInformation
    
    val passenger= new Passenger("Sparkjava") with information
    
    passenger.checkIn
    
  }   
}



  运行结果 
  
  Loggin name:  DTspark
Logger:  DTspark
Loggin name:  Hello scala
RichLogger:  Hello scala
a Logger:  
b Logger:  
c Logger:  
d Logger:  
e Logger:  
Loggin name:  abcde
e Logger:  abcde
getInformation:  Spark
getInformation:  Sparkjava
getInformation.equals Spark    false