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 }
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 }
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 }
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 }
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 }
时间： 2024-11-15 19:45:20