大数据Spark “蘑菇云”行动前传第16课：Scala implicits编程彻底实战及Spark源码鉴赏

大数据Spark “蘑菇云”行动前传第16课：Scala implicits编程彻底实战及Spark源码鉴赏
1 Spark源码Scala implicits的使用
2 Scala implicits实战
3 Scala implicits企业级最佳实践

 

 

 

 

 

 

 

 

 

 

 

 

package com.dt.spark.scala.bascis

class Man (val name:String)
/* 第一种方式 
 * object Man {
  implicit def man2SuperMan(man:Man) = new  SuperMan(man.name)
}*/

class SuperMan(val name:String){
 def  makeMiracles= println(this.name +"    wow wow , i am superman")
}



object IMFimplicits {
  //第二种方式
   implicit def man2SuperMan(man:Man) = new  SuperMan(man.name)

}

object HelloImplicits {
  def main(args: Array[String]): Unit = {
    import com.dt.spark.scala.bascis.IMFimplicits._
    val man =new Man("scla")
    man.makeMiracles
    //做默认配置
    implicit val content = "Dollar"
   // talk("java")("money")
     talk("java")
       talk("java")("spark")
  }
  
 def talk(name:String)(implicit content :String) = println(name+ " : "+content)
  
  
}





  运行 
结果

scla    wow wow , i am superman
java : Dollar
java : spark