commnand.scala

App.scala

package com.mycode

object App {
  def main(args : Array[String]) {
    val addSalt = new AddSaltCommand
    val addWater = new AddWaterCommand
    val makeSaltWater = new MakeSaltWaterCommand

    addSalt.setBeaker(new Beaker(100,0))
    addWater.setBeaker(new Beaker(0,10))
    makeSaltWater.setBeaker(new Beaker(90,10))

    addSalt.execute
    addWater.execute
    makeSaltWater.execute
  }
}

class Beaker(var water:Double,var salt:Double){
  private var melted :Boolean = true

  this.mix

  def addSalt(salt:Double) {
    this.salt += salt
  }

  def addWater(water:Double) {
    this.water += water
  }

  def mix {
    this.melted = if((this.salt / (this.salt + this.water)) * 100 < 26.4){
      true
    }else{
      false
    }
  }

  def isMelted ={
    this.melted
  }

  def note {
    println(s"水:${water}g")
    println(s"食塩: ${salt}g")
    println(s"濃度: ${(salt / (water + salt)) * 100}%")
  }
}

trait Command {
  protected var beaker:Beaker

  def setBeaker(beaker:Beaker) {
    this.beaker = beaker
  }

  def execute{}
}

class AddSaltCommand extends Command {
  protected var beaker: Beaker = _

  override def execute{
    while(!beaker.isMelted){
      beaker.addSalt(1)
      beaker.mix
    }

    println("食塩を1gずつ加える実験")
    beaker.note
  }
}

class AddWaterCommand extends Command {
  protected var beaker: Beaker = _
  override def execute{
    while(!beaker.isMelted){
      beaker.addWater(10)
      beaker.mix
    }

    println("水を10gずつ加える実験")
    beaker.note
  }
}

class MakeSaltWaterCommand extends Command {
  protected var beaker: Beaker = _
  override def execute{
    beaker.mix
    println("食塩水を作る実験")
    beaker.note
  }
}