设计模式学习--策略模式

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _1.StrategyPattern
{
//定义接口
    public interface IFLY
    {
        string Fly();
    }

//具体实现算法1
    public class RockFly : IFLY
    {


        public string Fly()
        {
            return "fly like rock";
        }
    }
//具体实现算法2
    public class NormalFly : IFLY
    {


        public string Fly()
        {
            return "fly like normal";
        }
    }
    public class CanotFly : IFLY
    {


        public string Fly()
        {
            return " can‘t fly";
        }
    }

    public interface IQuack
    {
        string DuckQuack();
    }

    public class QuackBehavior : IQuack
    {
        public string DuckQuack()
        {
            return "NormalQuack";
        }
    }
    public class WiredQuackBehavior : IQuack
    {
        public string DuckQuack()
        {
            return "it‘s sounds like wired annimal";
        }
    }
    public class CantQuackBehavior : IQuack
    {
        public string DuckQuack()
        {
            return "no sounds";
        }
    }

    public class Duck
    {
        IFLY f;
        IQuack quack;
        public Duck()
        {
            f = new NormalFly();//在构造函数中实例化需要的算法
            quack = new QuackBehavior();
        }


        public void setFly(IFLY fly)
        {

            f = fly;//动态设置需要的算法
        }
        public string DuckFly()
        {
            return f.Fly();
        }
        public string DuckQuack()
        {
            return quack.DuckQuack();
        }
    }

    public class MachineDuck
    {
        IFLY f;
        IQuack quack;
        public MachineDuck()
        {
            f = new RockFly();
            quack = new CantQuackBehavior();
        }
        public string DuckFly()
        {
            return f.Fly();
        }
        public string DuckQuack()
        {
            return quack.DuckQuack();
        }
    }
}