课程内容提交

2020-09-08 09:47:30 +08:00
parent bd25f30310
commit f7617cdfec
5 changed files with 870 additions and 0 deletions
--- a/DataStructureAndAlgorithm/03
+++ b/DataStructureAndAlgorithm/03
@@ -0,0 +1,870 @@
+# 03 C#<23><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> I
+
+
+**֪ʶ<D6AA>ṹ<EFBFBD><E1B9B9>**
+
+![ͼ1 ֪ʶ<D6AA>ṹ](https://img-blog.csdnimg.cn/20200908093951579.png)
+
+---
+## 1<><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+- <20>ࣺ<EFBFBD>ø߼<C3B8><DFBC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>ֵ<EFBFBD>һ<EFBFBD><D2BB>ADT<44><54><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+- <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD><C4B1><EFBFBD><EFBFBD><EFBFBD>
+
+---
+## 2<><32><EFBFBD><EFBFBD>װ
+
+**2.1 ʲô<CAB2>Ƿ<EFBFBD>װ**
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Է<EFBFBD>ֹ<EFBFBD>ⲿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>ֹ<EFBFBD><EFBFBD>̡<EFBFBD>
+
+**2.2 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>װ**
+
+- ͨ<><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>η<EFBFBD>`private`<EFBFBD><EFBFBD>`protected`<EFBFBD><EFBFBD>`public`<EFBFBD><EFBFBD>`internal`<EFBFBD><EFBFBD>ʵ<EFBFBD>֡<EFBFBD>
+- <20><><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><D0B5><EFBFBD><EFBFBD>ݣ<EFBFBD>Data<74><61><EFBFBD>Ͳ<EFBFBD><CDB2><EFBFBD><EFBFBD><EFBFBD>Operation<6F><6E><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>η<EFBFBD><CEB7><EFBFBD>
+    - `private`<EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʣ<EFBFBD>Ĭ<EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD>
+    - `protected`<EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʡ<EFBFBD>
+    - `public`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ⲿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Է<EFBFBD><EFBFBD>ʡ<EFBFBD>
+    - `internal`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʣ<EFBFBD><EFBFBD>൱<EFBFBD><EFBFBD>`public`<EFBFBD><EFBFBD>
+- <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>η<EFBFBD><CEB7><EFBFBD>
+    - `public`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>á<EFBFBD>
+    - `internal`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD>ʹ<EFBFBD>ã<EFBFBD>Ĭ<EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD>
+
+ע<EFBFBD><EFBFBD>`internal`<EFBFBD><EFBFBD><EFBFBD>ε<EFBFBD><EFBFBD>࣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԣ<EFBFBD>ֻҪ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>඼<EFBFBD><EFBFBD><EFBFBD>Է<EFBFBD><EFBFBD>ʣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߲<EFBFBD><EFBFBD><EFBFBD>ͬһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ռ䣬ֻҪʹ<EFBFBD><EFBFBD>`using`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ռ伴<EFBFBD>ɣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ռ䲢<EFBFBD><EFBFBD><EFBFBD>ǽ綨<EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ģ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǳ<EFBFBD>֤ȫ<EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD>Ψһ<EFBFBD>Եġ<EFBFBD>
+
+<EFBFBD>ο<EFBFBD>ͼ<EFBFBD>ģ<EFBFBD>
+- [<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ<EFBFBD>ģ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>C#<23><>internal<61>޶<EFBFBD><DEB6><EFBFBD><EFBFBD>η<EFBFBD><CEB7><EFBFBD>](https://mp.weixin.qq.com/s?__biz=MzIyNDA1NjA1NQ==&mid=2651012035&idx=1&sn=442e2b1e601082b6553ffa06e52c0ae4&chksm=f3e35c5bc494d54d43d9b78947f8e9995208e6404dcd1c92625f780338924261936d227f132d&token=1238973891&lang=zh_CN#rd)
+
+**2.3 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ**
+
+- <20><>ͼ<EFBFBD><CDBC>Class Diagram<61><6D>
+    - -<2D><>`private`
+    - +<2B><>`public`
+    - #<23><>`protected`
+
+![ͼ2 Class Diagram](https://img-blog.csdnimg.cn/2020090718494457.png)
+
+<EFBFBD><EFBFBD>1<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼʵ<EFBFBD><EFBFBD>Animal<EFBFBD><EFBFBD><EFBFBD>͡<EFBFBD>
+
+
+![ͼ3 Class Diagram](https://img-blog.csdnimg.cn/20200907185820336.png)
+
+```c
+public class Animal
+{
+    public int Age;
+    public double Weight;
+    public void Eat()
+    {
+        Console.WriteLine("Animal Eat.");
+    }
+    public void Sleep()
+    {
+        Console.WriteLine("Animal Sleep.");
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Animal al = new Animal();
+        al.Eat();// Animal Eat.
+        al.Sleep();// Animal Sleep.
+    }
+}
+```
+
+---
+## 3<><33><EFBFBD>̳<EFBFBD>
+
+**3.1 ʲô<CAB2>Ǽ̳<C7BC>**
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӵ<EFBFBD>и<EFBFBD><EFBFBD><EFBFBD>ĳЩData<EFBFBD><EFBFBD>Operation<EFBFBD>Ĺ<EFBFBD><EFBFBD>̡<EFBFBD>
+
+**3.2 <20><><EFBFBD><EFBFBD><EFBFBD>̳<EFBFBD>**
+
+
+```c
+public class Child : Parent
+{ 
+    //<2F><> 
+}
+````
+- `Child`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ࣨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ࣩ<EFBFBD><EFBFBD>`Parent`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ࣨ<EFBFBD><EFBFBD><EFBFBD>ࣩ
+- <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD>á<EFBFBD>:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD>̳С<EFBFBD>
+
+C# ֻ֧<EFBFBD>ֵ<EFBFBD><EFBFBD>̳У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Զ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳е<EFBFBD><EFBFBD>ࡣ
+```
+public sealed class Name
+{
+    //...
+}
+```
+- <20><><EFBFBD><EFBFBD>`sealed`<60>ؼ<EFBFBD><D8BC>ֿɷ<D6BF>ֹ<EFBFBD><D6B9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>౻<EFBFBD>̳С<CCB3>
+
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>븸<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ̳й<EFBFBD>ϵ<EFBFBD><EFBFBD>
+- <20><><EFBFBD><EFBFBD>  `public`  `protected`  `private`   `internal`
+- <20><><EFBFBD><EFBFBD>  `public`  `protected`  <20>޷<EFBFBD><DEB7>̳<EFBFBD>  `internal`
+
+**3.3 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʸ<EFBFBD><CAB8><EFBFBD><EFBFBD><EFBFBD>Ա**
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD>`base`<60>ؼ<EFBFBD><D8BC>֡<EFBFBD>
+
+<EFBFBD><EFBFBD>2<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҹ<EFBFBD><EFBFBD>๹<EFBFBD>캯<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+```c
+public class Parent
+{
+    private int _data1; // ֻ<>ܱ<EFBFBD><DCB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><DAB2><EFBFBD><EFBFBD><EFBFBD>
+    protected int Data2; // <20>ܱ<EFBFBD><DCB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʺͼ̳<CDBC>
+    public int Data3; // <20>ܱ<EFBFBD><DCB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʺͼ̳<CDBC>
+}
+
+public class Child : Parent
+{
+    public Child()
+    {
+        base.Data2 = 2;
+        base.Data3 = 3;
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Child cld = new Child();
+        Console.WriteLine(cld.Data3); // 3
+    }
+}
+```
+
+<EFBFBD><EFBFBD>3<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҹ<EFBFBD><EFBFBD>๹<EFBFBD>캯<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+```c
+public class Parent
+{
+    private int _data1; // ֻ<>ܱ<EFBFBD><DCB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><DAB2><EFBFBD><EFBFBD><EFBFBD>
+    protected int Data2; // <20>ܱ<EFBFBD><DCB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʺͼ̳<CDBC>
+    public int Data3; // <20>ܱ<EFBFBD><DCB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʺͼ̳<CDBC>
+    public Parent(int dt1, int dt2, int dt3)
+    {
+        _data1 = dt1;
+        Data2 = dt2;
+        Data3 = dt3;
+    }
+}
+
+public class Child : Parent
+{
+    public Child() : base(0, 2, 3)
+    {
+        ;
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Child cld = new Child();
+        Console.WriteLine(cld.Data3);// 3
+    }
+}
+```
+
+**3.4 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ**
+
+- ͨ<><CDA8><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD>ʾ
+
+
+![ͼ4 <20>̳й<CCB3>ϵ](https://img-blog.csdnimg.cn/2020090718590952.png)
+
+<EFBFBD><EFBFBD>4<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼʵ<EFBFBD>ֳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>룬ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD>ļ̳й<EFBFBD>ϵ<EFBFBD><EFBFBD>
+
+
+![ͼ5 Class Diagram](https://img-blog.csdnimg.cn/20200907185946630.png)
+
+```c
+public class Animal
+{
+    public int Age;
+    public double Weight;
+    public void Eat()
+    {
+        Console.WriteLine("Animal Eat.");
+    }
+    public void Sleep()
+    {
+        Console.WriteLine("Animal Sleep.");
+    }
+}
+
+public class Bird : Animal
+{
+    public void Fly()
+    {
+        Console.WriteLine("Bird Fly.");
+    }
+}
+
+public class Dog : Animal
+{
+    public void Run()
+    {
+        Console.WriteLine("Dog Run.");
+    }
+}
+
+public class Fish : Animal
+{
+    public void Swim()
+    {
+        Console.WriteLine("Fish Swim.");
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Dog dog = new Dog();
+        dog.Run(); //Dog Run.
+        Bird bird = new Bird();
+        bird.Fly(); //Bird Fly.
+        Fish fish = new Fish();
+        fish.Swim(); //Fish Swim.
+    }
+}
+```
+
+**3.5 ʵ<><CAB5><EFBFBD><EFBFBD>**
+
+Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>洢<EFBFBD>ռ<EFBFBD><EFBFBD>Ĺ<EFBFBD><EFBFBD>̡<EFBFBD>
+
+<EFBFBD><EFBFBD>5<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+```c
+public class Animal
+{
+    public int Age;
+    public double Weight;
+    public void Eat()
+    {
+        Console.WriteLine("Animal Eat.");
+    }
+    public void Sleep()
+    {
+        Console.WriteLine("Animal Sleep.");
+    }
+}
+
+public class Dog : Animal
+{
+    public void Run()
+    {
+        Console.WriteLine("Dog Run.");
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Animal al = new Animal(); // ʵ<><CAB5><EFBFBD><EFBFBD>Animal
+        al.Eat(); // Animal Eat.
+        al.Sleep(); // Animal Sleep.
+
+        Dog dg = new Dog(); // ʵ<><CAB5><EFBFBD><EFBFBD>Dog
+        dg.Age = 2;
+        dg.Weight = 4.5;
+        Console.WriteLine("Dog Infor: Age:{0},Weight:{1}",
+            dg.Age, dg.Weight);
+        // Dog Infor: Age:2, Weight:4.5
+        dg.Sleep(); // Animal Sleep.
+        dg.Eat(); // Animal Eat.
+        dg.Run(); // Dog Run.
+    }
+}
+```
+
+<EFBFBD><EFBFBD>6<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>븸<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+![ͼ6 Class Diagram](https://img-blog.csdnimg.cn/20200907190525103.png)
+
+```c
+public class Animal
+{
+    public int Age;
+    public double Weight;
+
+    public void Eat()
+    {
+        Console.WriteLine("Animal Eat.");
+    }
+
+    public void Sleep()
+    {
+        Console.WriteLine("Animal Sleep.");
+    }
+}
+
+public class Dog : Animal
+{
+    public void Eat()
+    {
+        Console.WriteLine("Dog Eat.");
+    }
+
+    public void Sleep()
+    {
+        Console.WriteLine("Dog Sleep.");
+    }
+
+    public void Run()
+    {
+        Console.WriteLine("Dog Run.");
+    }
+}
+class Program
+{
+    static void Main(string[] args)
+    {
+        Animal al = new Dog(); // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+        al.Eat(); // Animal Eat.<2E><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⣩
+        al.Sleep(); // Animal Sleep.
+
+        Dog dg = al as Dog; //ǿ<><C7BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>Dog dg = (Dog)al;
+        dg.Eat(); // Dog Eat.
+        dg.Sleep(); // Dog Sleep.
+        dg.Run(); // Dog Run.
+    }
+}
+```
+
+ע<EFBFBD>⣺
+
+- `Animal al = new Dog();`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȷ<EFBFBD><EFBFBD>
+- `Dog dg = new Animal();`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>࣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>಻<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>࣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD>`Dog`һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>`Animal`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>`Animal`<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>`Dog`<EFBFBD><EFBFBD>
+
+- `Animal al = new Dog();`
+- `Dog dg = al;`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫǿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+- `Dog dg = al as Dog;` <20><><EFBFBD><EFBFBD>ȷ<EFBFBD><C8B7><EFBFBD><EFBFBD>`al`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>`Dog`<EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>null<EFBFBD><EFBFBD>
+- `Dog dg = (Dog)al;` <20><><EFBFBD><EFBFBD>ȷ<EFBFBD><C8B7><EFBFBD><EFBFBD>`al`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>`Dog`<EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>׳<EFBFBD><EFBFBD>쳣<EFBFBD><EFBFBD>
+
+
+
+
+---
+## 4<><34><EFBFBD><EFBFBD>̬
+
+**4.1 ʲô<CAB2>Ƕ<EFBFBD>̬**
+
+<EFBFBD><EFBFBD>ͬ<EFBFBD>Ĳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Operation<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD>ͬ<EFBFBD>Ķ<EFBFBD><EFBFBD>󣬿<EFBFBD><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD>ͬ<EFBFBD>Ľ<EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD>ִ<EFBFBD>н<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+**4.2 <20><>̬<EFBFBD>ķ<EFBFBD><C4B7><EFBFBD>**
+- <20><><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1>̬<EFBFBD><CCAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>ִ<EFBFBD><D6B4><EFBFBD>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>override<64><65>д<EFBFBD><D0B4>
+- <20><><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1>̬<EFBFBD><CCAC><EFBFBD>ڱ<EFBFBD><DAB1><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>ִ<EFBFBD><D6B4><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><D0B5>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>overload<61><64><EFBFBD>أ<EFBFBD>
+
+**4.3 <20><>̬<EFBFBD><CCAC>ʵ<EFBFBD><CAB5>**
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>̬<EFBFBD><EFBFBD>
+
+- <20>ڸ<EFBFBD><DAB8><EFBFBD><EFBFBD>ж<EFBFBD><D0B6>岢ʵ<E5B2A2><CAB5><EFBFBD>鷽<EFBFBD><E9B7BD><EFBFBD><EFBFBD>virtual<61><6C>
+- <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>и<EFBFBD>д<EFBFBD><D0B4>override<64><65><EFBFBD><EFBFBD><EFBFBD>鷽<EFBFBD><E9B7BD><EFBFBD><EFBFBD>
+- <20>鷽<EFBFBD><E9B7BD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>з<EFBFBD><D0B7><EFBFBD><EFBFBD><EFBFBD>
+- <20><>д<EFBFBD>鷽<EFBFBD><E9B7BD><EFBFBD><EFBFBD>Ҫ<EFBFBD>󷽷<EFBFBD><F3B7BDB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>βΣ<CEB2><CEA3><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD>ͱ<EFBFBD><CDB1><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><CDAC>
+
+<EFBFBD><EFBFBD>7<EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>̬<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD>
+
+![ͼ7 Class Diagram](https://img-blog.csdnimg.cn/20200907192621578.png)
+
+```c
+public class Animal
+{
+    public int Age;
+    public double Weight;
+
+    public virtual void Eat()
+    {
+        Console.WriteLine("Animal Eat.");
+    }
+
+    public virtual void Sleep()
+    {
+        Console.WriteLine("Animal Sleep.");
+    }
+}
+
+public class Dog : Animal
+{
+    public override void Eat()
+    {
+        Console.WriteLine("Dog Eat.");
+    }
+
+    public override void Sleep()
+    {
+        Console.WriteLine("Dog Sleep.");
+    }
+
+    public virtual void Run()
+    {
+        Console.WriteLine("Dog Run.");
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Animal al = new Dog();
+        //<2F><>ִ<EFBFBD><D6B4>ʱ<EFBFBD><CAB1>ͨ<EFBFBD><CDA8><EFBFBD>ж<EFBFBD>al<61><6C><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><D6B4><EFBFBD>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD>е<EFBFBD><D0B5>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD><EFBFBD>;
+        al.Eat(); // Dog Eat.
+        al.Sleep(); // Dog Sleep.
+    }
+}
+```
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>̬<EFBFBD><EFBFBD>
+
+- <20><><EFBFBD>ж<EFBFBD><D0B6><EFBFBD><EFBFBD>ķ<EFBFBD><C4B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD>ͬ<EFBFBD>İ汾<C4B0><E6B1BE>
+- <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>أ<EFBFBD>`operator`<EFBFBD>ؼ<EFBFBD><EFBFBD><EFBFBD>
+- public static <20><><EFBFBD><EFBFBD> operator <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(<28>β<EFBFBD><CEB2>б<EFBFBD>){ <20><> }
+- <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>أ<EFBFBD><D8A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD>ķ<EFBFBD><C4B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD>ͬ<EFBFBD>Ĳ<EFBFBD><C4B2><EFBFBD><EFBFBD>б<EFBFBD><D0B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD>ķ<EFBFBD><C4B7><EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD>
+
+<EFBFBD><EFBFBD>8<EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼʵ<EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>̬<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD>
+
+![ͼ8 Class Diagram](https://img-blog.csdnimg.cn/2020090808531193.png)
+
+```c
+public class Complex
+{
+    public int A;
+    public int B;
+
+    public Complex(int a, int b)
+    {
+        this.A = a; //this<69><73>ʾ<EFBFBD><CABE><EFBFBD>ڴ<EFBFBD><DAB4><EFBFBD>Complex<65><78><EFBFBD><EFBFBD>
+        this.B = b;
+    }
+
+    public static Complex operator +(Complex c1, Complex c2)
+    {
+        return new Complex(c1.A + c2.A, c1.B + c2.B);
+    }
+
+    public override string ToString()
+    {
+        return string.Format("{0}+{1}i", A, B);
+    }
+}
+
+public class Math
+{
+    public int Add(int x, int y)
+    {
+        return x + y;
+    }
+
+    public double Add(double x, double y)
+    {
+        return x + y;
+    }
+
+    public Complex Add(Complex x, Complex y)
+    {
+        return x + y;
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Complex c1 = new Complex(1, 2);
+        Complex c2 = new Complex(3, 4);
+        Complex c3 = c1 + c2;
+        Console.WriteLine("C1={0}", c1); // C1=1+2i
+        Console.WriteLine("C2={0}", c2); // C2=3+4i
+        Console.WriteLine("C3={0}", c3); // C3=4+6i
+        Math mth = new Math();
+        Complex c4 = mth.Add(c2, c3);
+        //<2F>ڱ<EFBFBD><DAB1><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD>ݲ<EFBFBD><DDB2><EFBFBD><EFBFBD>б<EFBFBD><D0B1><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><D6B4><EFBFBD>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD>е<EFBFBD><D0B5>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD><EFBFBD>;
+        Console.WriteLine("C4={0}", c4); // C4=7+10i
+    }
+}
+```
+
+<EFBFBD>ܽ᣺`override`<EFBFBD><EFBFBD>`overload`
+
+
+![](https://img-blog.csdnimg.cn/2020090809435588.png)
+
+
+
+**4.4 <20><><EFBFBD>󷽷<EFBFBD><F3B7BDB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>**
+
+- <20><><EFBFBD>󷽷<EFBFBD><F3B7BDB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Կ<EFBFBD><D4BF><EFBFBD>û<EFBFBD><C3BB>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>鷽<EFBFBD><E9B7BD><EFBFBD><EFBFBD>`abstract`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD>з<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>и<EFBFBD>д<EFBFBD><EFBFBD>`override`<EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+- <20><><EFBFBD><EFBFBD><EFBFBD>ࣺ<EFBFBD><E0A3BA><EFBFBD>г<EFBFBD><D0B3>󷽷<EFBFBD><F3B7BDB7><EFBFBD><EFBFBD>ࡣ<EFBFBD><E0A1A3><EFBFBD><EFBFBD><EFBFBD>಻<EFBFBD><E0B2BB><EFBFBD><EFBFBD>ֱ<EFBFBD><D6B1>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+<EFBFBD><EFBFBD>9<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼʵ<EFBFBD>ִ<EFBFBD><EFBFBD><EFBFBD>
+
+![ͼ9 Class Diagram](https://img-blog.csdnimg.cn/2020090809021457.png)
+
+```c
+public abstract class Animal
+{
+    public int Age;
+    public double Weight;
+    public abstract void Eat();
+    public abstract void Sleep();
+}
+
+public class Dog : Animal
+{
+    public override void Eat()
+    {
+        Console.WriteLine("Dog Eat.");
+    }
+    public override void Sleep()
+    {
+        Console.WriteLine("Dog Sleep.");
+    }
+    public void Run()
+    {
+        Console.WriteLine("Dog Run.");
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Animal al = new Dog();
+        al.Eat(); // Dog Eat.
+        al.Sleep(); // Dog Sleep.
+        ((Dog)al).Run(); // Dog Run.
+    }
+}
+```
+
+ע<EFBFBD>⣺
+- `al.Run();`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+- `((Dog)al).Run();`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȷ<EFBFBD><EFBFBD>
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD>û<EFBFBD><EFBFBD>Run<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫǿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+- `Animal al = new Animal ();`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>಻<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>׳<EFBFBD><EFBFBD>쳣<EFBFBD><EFBFBD>
+
+<EFBFBD>ܽ᣺<EFBFBD><EFBFBD><EFBFBD>󷽷<EFBFBD><EFBFBD><EFBFBD><EFBFBD>鷽<EFBFBD><EFBFBD>![](https://img-blog.csdnimg.cn/20200908094431953.png)
+
+
+<EFBFBD><EFBFBD>10<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ
+
+ĳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD>Raiser<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀǰ״̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Dog<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Bird<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>㣨Fish<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֶ<EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˯<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Sleep<EFBFBD><EFBFBD><EFBFBD>ͳԷ<EFBFBD><EFBFBD><EFBFBD>Eat<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɡ<EFBFBD>
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƶġ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD>򡱡<EFBFBD>
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>
+
+![ͼ10 Class Diagram](https://img-blog.csdnimg.cn/20200908091105732.png)
+
+```c++
+public class Bird
+{
+    public void Eat()
+    {
+        Console.WriteLine("Bird Eat.");
+    }
+    public void Sleep()
+    {
+        Console.WriteLine("Bird Sleep.");
+    }
+    public void Fly()
+    {
+        Console.WriteLine("Bird Fly.");
+    }
+}
+
+public class Dog
+{
+    public void Eat()
+    {
+        Console.WriteLine("Dog Eat.");
+    }
+    public void Sleep()
+    {
+        Console.WriteLine("Dog Sleep.");
+    }
+    public void Run()
+    {
+        Console.WriteLine("Dog Run.");
+    }
+}
+
+public class Fish
+{
+    public void Eat()
+    {
+        Console.WriteLine("Fish Eat.");
+    }
+    public void Sleep()
+    {
+        Console.WriteLine("Fish Sleep.");
+    }
+    public void Swim()
+    {
+        Console.WriteLine("Fish Swim.");
+    }
+}
+
+public class Raiser
+{
+    public void RaiseDog()
+    {
+        Dog dog = new Dog();
+        dog.Eat();
+        dog.Sleep();
+    }
+    public void RaisBird()
+    {
+        Bird bird = new Bird();
+        bird.Eat();
+        bird.Sleep();
+    }
+    public void RaisFish()
+    {
+        Fish fish = new Fish();
+        fish.Eat();
+        fish.Sleep();
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Raiser rar = new Raiser();
+        rar.RaiseDog();
+        // Dog Eat.
+        // Dog Sleep.
+        rar.RaisBird();
+        // Bird Eat.
+        // Bird Sleep.
+        rar.RaisFish();
+        // Fish Eat.
+        // Fish Sleep.
+    }
+}
+```
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+![ͼ11 Class Diagram](https://img-blog.csdnimg.cn/20200908092632785.png)
+
+```c
+public class Bird
+{
+    public void Eat()
+    {
+        Console.WriteLine("Bird Eat.");
+    }
+
+    public void Sleep()
+    {
+        Console.WriteLine("Bird Sleep.");
+    }
+
+    public void Fly()
+    {
+        Console.WriteLine("Bird Fly.");
+    }
+}
+
+public class Dog
+{
+    public void Eat()
+    {
+        Console.WriteLine("Dog Eat.");
+    }
+
+    public void Sleep()
+    {
+        Console.WriteLine("Dog Sleep.");
+    }
+
+    public void Run()
+    {
+        Console.WriteLine("Dog Run.");
+    }
+}
+
+public class Fish
+{
+    public void Eat()
+    {
+        Console.WriteLine("Fish Eat.");
+    }
+
+    public void Sleep()
+    {
+        Console.WriteLine("Fish Sleep.");
+    }
+
+    public void Swim()
+    {
+        Console.WriteLine("Fish Swim.");
+    }
+}
+
+public enum AnimalType
+{
+    Dog,
+    Bird,
+    Fish
+};
+
+public class Raiser
+{
+    public void Raise(AnimalType alt)
+    {
+        switch (alt)
+        {
+            case AnimalType.Bird:
+                Bird bird = new Bird();
+                bird.Eat();
+                bird.Sleep();
+                break;
+            case AnimalType.Dog:
+                Dog dog = new Dog();
+                dog.Eat();
+                dog.Sleep();
+                break;
+            case AnimalType.Fish:
+                Fish fish = new Fish();
+                fish.Eat();
+                fish.Sleep();
+                break;
+        }
+    }
+}
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Raiser rar = new Raiser();
+        rar.Raise(AnimalType.Dog);
+        // Dog Eat.
+        // Dog Sleep.
+        rar.Raise(AnimalType.Bird);
+        // Bird Eat.
+        // Bird Sleep.
+        rar.Raise(AnimalType.Fish);
+        // Fish Eat.
+        // Fish Sleep.
+    }
+}
+```
+
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+![ͼ12 Class Diagram](https://img-blog.csdnimg.cn/20200908093122441.png)
+
+```c
+public abstract class Animal
+{
+    public int Age;
+    public double Weight;
+    public abstract void Eat();
+    public abstract void Sleep();
+}
+
+public class Bird : Animal
+{
+    public override void Eat()
+    {
+        Console.WriteLine("Bird Eat.");
+    }
+
+    public override void Sleep()
+    {
+        Console.WriteLine("Bird Sleep.");
+    }
+
+    public void Fly()
+    {
+        Console.WriteLine("Bird Fly.");
+    }
+}
+
+public class Dog : Animal
+{
+    public override void Eat()
+    {
+        Console.WriteLine("Dog Eat.");
+    }
+
+    public override void Sleep()
+    {
+        Console.WriteLine("Dog Sleep.");
+    }
+
+    public void Run()
+    {
+        Console.WriteLine("Dog Run.");
+    }
+}
+
+public class Fish : Animal
+{
+    public override void Eat()
+    {
+        Console.WriteLine("Fish Eat.");
+    }
+
+    public override void Sleep()
+    {
+        Console.WriteLine("Fish Sleep.");
+    }
+
+    public void Swim()
+    {
+        Console.WriteLine("Fish Swim.");
+    }
+}
+
+public class Raiser
+{
+    public void Raise(Animal al)
+    {
+        al.Eat();
+        al.Sleep();
+    }
+}
+
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Raiser rsr = new Raiser();
+        rsr.Raise(new Dog());
+        // Dog Eat.
+        // Dog Sleep.
+        rsr.Raise(new Bird());
+        // Bird Eat.
+        // Bird Sleep.
+        rsr.Raise(new Fish());
+        // Fish Eat.
+        // Fish Sleep.
+    }
+}
+```
+
--- a/DataStructureAndAlgorithm/04
+++ b/DataStructureAndAlgorithm/04
--- a/DataStructureAndAlgorithm/06
+++ b/DataStructureAndAlgorithm/06
--- a/DataStructureAndAlgorithm/07
+++ b/DataStructureAndAlgorithm/07
--- a/DataStructureAndAlgorithm/08
+++ b/DataStructureAndAlgorithm/08