用C#改写Head First Design PatternsStrategy策略模式（原创）

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

namespace Strategy
{
    /// <summary>
    /// 具有飞行行为
    /// </summary>
    public interface FlyBehavior
    {
        void fly();
    }

    /// <summary>
    /// 具有吃饭行为
    /// </summary>
    public interface EatBehavior
    {
        void eat();
    }

    /// <summary>
    /// 用翅膀飞
    /// </summary>
    public class FlyWithWings: FlyBehavior
    {

        #region FlyBehavior 成员

        void FlyBehavior.fly()
        {
            System.Console.WriteLine("用翅膀飞");
        }

        #endregion
    }

    /// <summary>
    /// 用翅膀飞
    /// </summary>
    public class FlyNoWay : FlyBehavior
    {

        #region FlyBehavior 成员

        void FlyBehavior.fly()
        {
            System.Console.WriteLine("飞不了");
        }

        #endregion
    }

    public class EatMeat : EatBehavior
    {

        #region EatBehavior 成员

        void EatBehavior.eat()
        {
            System.Console.WriteLine("吃肉");
        }

        #endregion
    }

    public class EatAll : EatBehavior
    {

        #region EatBehavior 成员

        void EatBehavior.eat()
        {
            System.Console.WriteLine("什么都吃,杂食");
        }

        #endregion
    }
}

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

namespace Strategy
{
    class AnimalClass
    {
        public abstract class Animal
        {
            protected FlyBehavior fb;
            protected EatBehavior eb;
            public  string name;

            public Animal() { }

            public void Fly()
            {
                fb.fly();
            }

            public void Eat()
            {
                eb.eat();
            }
       
        }

        public class Tiger : Animal
        {
            public Tiger()
            {
                fb=  new FlyNoWay();
                eb = new EatMeat();
                name = "老虎";
            }
        }

        public class Eagle : Animal
        {

            public Eagle()
            {
                fb = new FlyWithWings();
                eb = new EatMeat();
                name = "老鹰";
            }
        }

        public class Human : Animal
        {
            public Human()
            {
                fb = new FlyNoWay();
                eb = new EatAll();
                name = "人类";
            }
        }
    }
}

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

namespace Strategy
{
    class Program
    {
        static void Main(string[] args)
        {
            Strategy.AnimalClass.Tiger t = new AnimalClass.Tiger();
            System.Console.WriteLine(t.name);
            t.Eat();
            t.Fly();
            Strategy.AnimalClass.Eagle e = new AnimalClass.Eagle();
            System.Console.WriteLine(e.name);
            e.Eat();
            e.Fly();
            Strategy.AnimalClass.Human h = new AnimalClass.Human();
            System.Console.WriteLine(h.name);
            h.Eat();
            h.Fly();
            System.Console.ReadLine();
        }
    }
}