多态、抽象类示例

1、一个多态例子

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Threading.Tasks;
  6 
  7 namespace _09多态
  8 {
  9     class Program
 10     {
 11         static void Main(string[] args)
 12         {
 13             //概念:让一个对象能够表现出多种的状态(类型)
 14             //实现多态的3种手段：1、虚方法 2、抽象类 3、接口
 15 
 16             Chinese cn1 = new Chinese("韩梅梅");
 17             Chinese cn2 = new Chinese("李雷");
 18             Japanese j1 = new Japanese("树下君");
 19             Japanese j2 = new Japanese("井边子");
 20             Korea k1 = new Korea("金秀贤");
 21             Korea k2 = new Korea("金贤秀");
 22             American a1 = new American("科比布莱恩特");
 23             American a2 = new American("奥尼尔");
 24             Person[] pers = { cn1, cn2, j1, j2, k1, k2, a1, a2, new English("格林"), new English("玛利亚") };
 25 
 26             for (int i = 0; i < pers.Length; i++)
 27             {
 28                 //if (pers[i] is Chinese)
 29                 //{
 30                 //    ((Chinese)pers[i]).SayHello();
 31                 //}
 32                 //else if (pers[i] is Japanese)
 33                 //{
 34                 //    ((Japanese)pers[i]).SayHello();
 35                 //}
 36                 //else if (pers[i] is Korea)
 37                 //{
 38                 //    ((Korea)pers[i]).SayHello();
 39                 //}
 40                 //else
 41                 //{
 42                 //    ((American)pers[i]).SayHello();
 43                 //}
 44 
 45 
 46                 pers[i].SayHello();
 47             }
 48             Console.ReadKey();
 49         }
 50     }
 51 
 52     public class Person
 53     {
 54         private string _name;
 55         public string Name
 56         {
 57             get { return _name; }
 58             set { _name = value; }
 59         }
 60 
 61         public Person(string name)
 62         {
 63             this.Name = name;
 64         }
 65         public virtual void SayHello()
 66         {
 67             Console.WriteLine("我是人类");
 68         }
 69 
 70     }
 71 
 72     public class Chinese : Person
 73     {
 74         public Chinese(string name)
 75             : base(name)
 76         {
 77 
 78         }
 79 
 80         public override void SayHello()
 81         {
 82             Console.WriteLine("我是中国人，我叫{0}", this.Name);
 83         }
 84     }
 85     public class Japanese : Person
 86     {
 87         public Japanese(string name)
 88             : base(name)
 89         { }
 90 
 91         public override void SayHello()
 92         {
 93             Console.WriteLine("我是脚盆国人，我叫{0}", this.Name);
 94         }
 95     }
 96     public class Korea : Person
 97     {
 98         public Korea(string name)
 99             : base(name)
100         {
101 
102         }
103 
104 
105         public override void SayHello()
106         {
107             Console.WriteLine("我是棒之思密达，我叫{0}", this.Name);
108         }
109     }
110     public class American : Person
111     {
112         public American(string name)
113             : base(name)
114         {
115 
116         }
117 
118         public override void SayHello()
119         {
120             Console.WriteLine("我叫{0}，我是米国人", this.Name);
121         }
122     }
123 
124 
125     public class English : Person
126     {
127         public English(string name)
128             : base(name)
129         { }
130 
131         public override void SayHello()
132         {
133             Console.WriteLine("我是英国人");
134         }
135     }
136 
137 }

View Code

2、多态练习

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Threading.Tasks;
  6 
  7 namespace _10多态练习
  8 {
  9     class Program
 10     {
 11         static void Main(string[] args)
 12         {
 13             //真的鸭子嘎嘎叫 木头鸭子吱吱叫 橡皮鸭子唧唧叫
 14             //RealDuck rd = new RealDuck();
 15             //rd.Bark();
 16             //MuDuck md = new MuDuck();
 17             //md.Bark();
 18             //XPDuck xd = new XPDuck();
 19             //xd.Bark();
 20             //Console.ReadKey();
 21 
 22             //RealDuck rd = new RealDuck();
 23             //MuDuck md = new MuDuck();
 24             //XPDuck xd = new XPDuck();
 25             //RealDuck[] ducks = { rd, md, xd };
 26             //for (int i = 0; i < ducks.Length; i++)
 27             //{
 28             //    ducks[i].Bark();
 29             //}
 30             //Console.ReadKey();
 31 
 32 
 33             //经理十一点打卡 员工9点打卡 程序猿不打卡
 34             //Employee emp = new Employee();
 35             //Manager mg = new Manager();
 36             //Programmer pm = new Programmer();
 37             //Employee[] emps = { emp, mg, pm };
 38             //for (int i = 0; i < emps.Length; i++)
 39             //{
 40             //    emps[i].DaKa();
 41             //}
 42             //Console.ReadKey();
 43 
 44 
 45 
 46             //狗狗会叫 猫咪也会叫
 47 
 48         }
 49     }
 50 
 51     public class Animal
 52     {
 53         public void Bark()
 54         { 
 55             
 56         }
 57     }
 58 
 59 
 60     public class Employee
 61     {
 62         public virtual void DaKa()
 63         {
 64             Console.WriteLine("九点打卡");
 65         }
 66     }
 67 
 68     public class Manager : Employee
 69     {
 70         public override void DaKa()
 71         {
 72             Console.WriteLine("经理11点打卡");
 73         }
 74     }
 75 
 76     public class Programmer : Employee
 77     {
 78         public override void DaKa()
 79         {
 80             Console.WriteLine("程序猿不打卡");
 81         }
 82     }
 83 
 84 
 85 
 86 
 87 
 88     public class RealDuck
 89     {
 90         public virtual void Bark()
 91         {
 92             Console.WriteLine("真的鸭子嘎嘎叫");
 93         }
 94     }
 95 
 96     public class MuDuck : RealDuck
 97     {
 98         public override void Bark()
 99         {
100             Console.WriteLine("木头鸭子吱吱叫");
101         }
102     }
103 
104     public class XPDuck : RealDuck
105     {
106         public override void Bark()
107         {
108             Console.WriteLine("橡皮鸭子唧唧叫");
109         }
110     }
111 }

View Code

3、抽象类的两个例子

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Threading.Tasks;
  6 
  7 namespace _11_抽象类
  8 {
  9     class Program
 10     {
 11         static void Main(string[] args)
 12         {
 13             //狗狗会叫 猫咪会叫
 14 
 15             Animal a = new Cat();//new Dog();
 16             a.Bark();
 17             
 18             Console.ReadKey();
 19         }
 20     }
 21 
 22     public abstract class Animal
 23     {
 24 
 25         public virtual void T()
 26         {
 27             Console.WriteLine("动物有声明");
 28         }
 29 
 30         private int _age;
 31 
 32         public int Age
 33         {
 34             get { return _age; }
 35             set { _age = value; }
 36         }
 37 
 38         public Animal(int age)
 39         {
 40             this.Age = age;
 41         }
 42         public abstract void Bark();
 43         public abstract string Name
 44         {
 45             get;
 46             set;
 47         }
 48 
 49      //   public abstract string TestString(string name);
 50 
 51 
 52         public Animal()
 53         { 
 54             
 55         }
 56         //public void Test()
 57         //{ 
 58         //    //空实现
 59         //}
 60     }
 61 
 62 
 63     public abstract class Test : Animal
 64     { 
 65         
 66     }
 67 
 68     public class Dog : Animal
 69     {
 70        // public abstract void Test();
 71 
 72 
 73         public override void Bark()
 74         {
 75             Console.WriteLine("狗狗旺旺的叫");
 76         }
 77 
 78         public override string Name
 79         {
 80             get
 81             {
 82                 throw new NotImplementedException();
 83             }
 84             set
 85             {
 86                 throw new NotImplementedException();
 87             }
 88         }
 89 
 90         //public override string TestString(string name)
 91         //{
 92         //    //throw new NotImplementedException();
 93         //}
 94     }
 95 
 96     public class Cat : Animal
 97     {
 98         public override void Bark()
 99         {
100             Console.WriteLine("猫咪喵喵的叫");
101         }
102 
103         public override string Name
104         {
105             get
106             {
107                 throw new NotImplementedException();
108             }
109             set
110             {
111                 throw new NotImplementedException();
112             }
113         }
114     }
115 }

View Code

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace _12_抽象类
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             //使用多态求矩形的面积和周长以及圆形的面积和周长
14             Shape shape = new Square(5, 6); //new Circle(5);
15             double area = shape.GetArea();
16             double perimeter = shape.GetPerimeter();
17             Console.WriteLine("这个形状的面积是{0},周长是{1}", area, perimeter);
18             Console.ReadKey();
19 
20         }
21     }
22 
23     public abstract class Shape
24     {
25         public abstract double GetArea();
26         public abstract double GetPerimeter();
27     }
28     public class Circle : Shape
29     {
30 
31         private double _r;
32         public double R
33         {
34             get { return _r; }
35             set { _r = value; }
36         }
37 
38         public Circle(double r)
39         {
40             this.R = r;
41         }
42         public override double GetArea()
43         {
44             return Math.PI * this.R * this.R;
45         }
46 
47         public override double GetPerimeter()
48         {
49             return 2 * Math.PI * this.R;
50         }
51     }
52     public class Square : Shape
53     {
54         private double _height;
55 
56         public double Height
57         {
58             get { return _height; }
59             set { _height = value; }
60         }
61 
62         private double _width;
63 
64         public double Width
65         {
66             get { return _width; }
67             set { _width = value; }
68         }
69 
70         public Square(double height, double width)
71         {
72             this.Height = height;
73             this.Width = width;
74         }
75 
76         public override double GetArea()
77         {
78             return this.Height * this.Width;
79         }
80 
81         public override double GetPerimeter()
82         {
83             return (this.Height + this.Width) * 2;
84         }
85     }
86 
87 }

View Code

4、用多态来实现将移动硬盘或者U盘或者MP3插到电脑上进行读写数据

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Threading.Tasks;
  6 
  7 namespace _13_电脑_移动硬盘_U盘_MP3
  8 {
  9     class Program
 10     {
 11         static void Main(string[] args)
 12         {
 13             //用多态来实现 将 移动硬盘或者U盘或者MP3插到电脑上进行读写数据
 14 
 15             //MobileDisk md = new MobileDisk();
 16             //UDisk u = new UDisk();
 17             //Mp3 mp3 = new Mp3();
 18             //Computer cpu = new Computer();
 19             //cpu.CpuRead(u);
 20             //cpu.CpuWrite(u);
 21             //Console.ReadKey();
 22 
 23             MobileStorage ms = new UDisk();//new Mp3();//new MobileDisk();//new UDisk();
 24             Computer cpu = new Computer();
 25             cpu.Ms = ms;
 26             cpu.CpuRead();
 27             cpu.CpuWrite();
 28             //Computer cpu = new Computer();
 29             //cpu.CpuRead(ms);
 30             //cpu.CpuWrite(ms);
 31             Console.ReadKey();
 32 
 33         }
 34     }
 35 
 36 
 37     /// <summary>
 38     /// 抽象的父类
 39     /// </summary>
 40     public abstract class MobileStorage
 41     {
 42         public abstract void Read();
 43         public abstract void Write();
 44     }
 45 
 46 
 47     public class MobileDisk : MobileStorage
 48     {
 49         public override void Read()
 50         {
 51             Console.WriteLine("移动硬盘在读取数据");
 52         }
 53         public override void Write()
 54         {
 55             Console.WriteLine("移动硬盘在写入数据");
 56         }
 57     }
 58     public class UDisk : MobileStorage
 59     {
 60         public override void Read()
 61         {
 62             Console.WriteLine("U盘在读取数据");
 63         }
 64 
 65         public override void Write()
 66         {
 67             Console.WriteLine("U盘在写入数据");
 68         }
 69     }
 70     public class Mp3 : MobileStorage
 71     {
 72         public override void Read()
 73         {
 74             Console.WriteLine("MP3在读取数据");
 75         }
 76 
 77         public override void Write()
 78         {
 79             Console.WriteLine("Mp3在写入数据");
 80         }
 81 
 82         public void PlayMusic()
 83         {
 84             Console.WriteLine("MP3自己可以播放音乐");
 85         }
 86     }
 87 
 88 
 89 
 90     public class Computer
 91     {
 92         private MobileStorage _ms;
 93 
 94         public MobileStorage Ms
 95         {
 96             get { return _ms; }
 97             set { _ms = value; }
 98         }
 99         public void CpuRead()
100         {
101             Ms.Read();
102         }
103 
104         public void CpuWrite()
105         {
106             Ms.Write();
107         }
108     }
109 }

View Code