Washing

interfaces_for_yasiu.cs

using System.IO;
using System;
using System.Collections.Generic;

interface IWasher
{
  void Wash();
}

class RedWaterWasher : IWasher
{
  public void Wash()
  {
    Console.WriteLine("Washing with red water.");
  }
}

class BlueWaterWasher : IWasher
{
  public void Wash()
  {
    Console.WriteLine("Washing with blue water.");
  }
}

class WashManager
{
  private List<IWasher> washers = new List<IWasher>();
  
  public void AddWasher(IWasher washer)
  {
      washers.Add(washer);
  }
  
  public void WashAll()
  {
    washers.ForEach(w => w.Wash());
  }
}

public class MyProgram
{
   public static void Main()
   {
      WashManager manager = new WashManager();
      
      manager.AddWasher(new RedWaterWasher());
      manager.AddWasher(new RedWaterWasher());
      manager.AddWasher(new BlueWaterWasher());
      manager.AddWasher(new BlueWaterWasher());
      
      manager.WashAll();
   }
}