策略模式

/**
  * 策略模式：
  * 1.scala 实现策略模式很简单 用函数定义策略
  * 2.定义一个类接收函数
  *
  * @author Yyyyy
  * @version 1.0
  *
  **/

/**
  * 操作数据的环境类(收银员)
  *
  * @param discount
  * @param originalPrice
  */
class Cashier(discount: Double => Double, originalPrice: Double) {
  val discountedPrice: Double = discount(originalPrice)
}

/**
  * 伴生对象
  */
object Cashier {
  def apply(discount: Double => Double, price: Double): Cashier = new Cashier(discount, price)
}

object Client {
  def main(args: Array[String]): Unit = {

    //打折策略
    val dis8 = (s: Double) => s * 0.9
    val dis9 = (p: Double) => p * 0.8

    //打八折
    val d8 = Cashier(dis8, 100)
    //打九折
    val d9 = Cashier(dis9, 200)

    println(d8.discountedPrice)
    println(d9.discountedPrice)

  }
}

执行结果

90.0
160.0

Process finished with exit code 0