Scala路径依赖【内部类】

 package big.data.analyse.scala.path_dependence

 /**
   * 路径依赖
   * Created by zhen on 2018/12/24.
   */
 // 定义外部类，内部类
 class Outer(val width: Int, val height : Int){
   //private val width = 12
   //private val height = 6

   class Inner{
     private val space = width * height

     def show(): Unit ={
       println(" the space is equal : " + space)
     }
   }
 }
 object PathDependence {
   def main(args: Array[String]) {
     val outer = new Outer(6, 8)
     val inner = new outer.Inner
     inner.show()
     // 特定类型的内部类
     val inner_belong_outer : outer.Inner = new outer.Inner
     inner_belong_outer.show()

     val another_other = new Outer(3, 4)
     //val another_inner : outer.Inner = new another_other.Inner // Inner doesn't conform
     val use_inner : Outer#Inner = new another_other.Inner // # 表示Inner是Outer的内部类
     use_inner.show()

   }
 }

结果：