Scala Composition

原创转载请注明出处：http://agilestyle.iteye.com/blog/2334870

 

食物与厨具具有存储、烹饪、清洗的能力，表示成一个“has-a”的关系

厨房和房间，为了突出厨房的“房间性”，表示成一个“is-a”的关系

记住：Prefer composition to inheritance

package org.fool.scala.composition

trait Building

trait Room

trait Storage

trait Sink

trait Store[T]

trait Cook[T]

trait Clean[T]

trait Food extends Store[Food] with Clean[Food] with Cook[Food]

trait Utensil extends Store[Utensil] with Clean[Utensil] with Cook[Utensil]

trait Kitchen extends Room {
  val storage: Storage
  val sinks: Vector[Sink]
  val food: Food
  val utensils: Vector[Utensil]
}

trait House extends Building {
  val kitchen: Vector[Kitchen]
}

object CompositionTest extends App {
  
}

 

参考资料：

Scala编程思想