Head First 设计模式 读书摘记（二） 策略模式 C#代码

策略模式：
定义了算法族，分别封装起来，让他们之间可以互相替换，此模式让算法的变化独立于使用算法的客户。

Strategy_Pattern

  1using System;
  2using System.Collections.Generic;
  3using System.Text;
  4
  5namespace Strategy_Pattern
  6{
  7    class Program
  8    {
  9        static void Main(string[] args)
 10        {
 11            Duck duck = new RedheadDuck();
 12            
 13            duck.display();
 14
 15            duck.performFly();
 16            duck.performQuack();
 17            IFlyBehavior fly;
 18            IQuackBehavior quack;
 19            fly = new FlyNoWay();
 20            quack = new Squack();
 21            duck.setFlyBehavior(fly);
 22            duck.setQuackBehavior(quack);
 23            duck.performFly();
 24            duck.performQuack();
 25            
 26            fly = new FlyRocketPowered();
 27            quack = new MuteQuack();
 28            duck.setFlyBehavior(fly);
 29            duck.setQuackBehavior(quack);
 30            duck.performFly();
 31            duck.performQuack();
 32
 33        }
 34    }
 35
 36    public interface IFlyBehavior //飞行接口
 37    { 
 38        void Fly();
 39        
 40    }
 41
 42    public class FlyWithWings : IFlyBehavior //用翅膀飞行
 43    {
 44        public void Fly()
 45        {
 46            Console.WriteLine("I'm fly with wings!!"); 
 47        }
 48    }
 49
 50    public class FlyNoWay : IFlyBehavior //不能飞行
 51    {
 52        public void Fly()
 53        {
 54            Console.WriteLine("I can't flying!!");
 55        }
 56    }
 57
 58    public class FlyRocketPowered : IFlyBehavior //用火箭飞行
 59    {
 60        public void Fly()
 61        {
 62            Console.WriteLine("I'm flying with a rocket!!");
 63        }
 64    }
 65
 66    public  interface IQuackBehavior //叫的接口
 67    {
 68        void quack();
 69        
 70    }
 71
 72    public class Quack : IQuackBehavior //呱呱叫
 73    {
 74        public void quack()
 75        {
 76            Console.WriteLine("Quack!!!");
 77        }
 78    }
 79
 80    public class Squack : IQuackBehavior //吱吱叫
 81    {
 82        public void quack()
 83        {
 84            Console.WriteLine("Squack!!!");
 85        }
 86    }
 87
 88    public class MuteQuack : IQuackBehavior  //不能叫
 89    {
 90        public void quack()
 91        {
 92            Console.WriteLine("Mute!!!");
 93        }
 94    }
 95
 96    public abstract class Duck   //鸭子抽象类
 97    {
 98        IFlyBehavior flyBehavior;
 99        IQuackBehavior quackBehavior;
100
101        public Duck()
102        { 
103            flyBehavior = new FlyWithWings() ;
104            quackBehavior = new Quack();
105        }
106
107        public void swim()
108        {
109            Console.WriteLine("I'm swimming!!");
110        }
111
112        public abstract void display();
113        
114        public void performFly()
115        {
116            flyBehavior.Fly();
117        }
118
119        public void performQuack()
120        {
121            quackBehavior.quack();
122        }
123
124        public void setFlyBehavior(IFlyBehavior fly)
125        {
126            flyBehavior = fly;
127        }
128
129        public void setQuackBehavior(IQuackBehavior quack)
130        {
131            quackBehavior = quack;
132        }
133
134    }
135
136    public class RedheadDuck : Duck //红头鸭
137    {
138        public override  void display()
139        {
140            Console.WriteLine("I'm a redhead duck!!");
141        }
142    }
143
144}
145