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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
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      首頁 > 編程開發 > .net教程 >
      • ASP.net教程之虛方法和多態

      • 2019-06-11 22:35 來源:未知
       
       1  class Program
       2     {
       3         static void Main(string[] args)
       4         {
       5             //Dog dog = new Dog();
       6             Pet dog = new Dog("DD");//創建指向派生類Dog的基類Pet的實例
       7             //dog.Name = "DD";
       8             dog.Speak();//此處是調用Pet類的虛方法Speak(),根據dog所指向的派生類Dog而調用Dog里的同名重寫方法Speak()---即多態
       9             //Cat cat = new Cat();
      10             Pet cat = new Cat("CC");//創建指向派生類Cat的基類Pet的實例
      11             //cat.Name = "CC";
      12             cat.Speak();//此處是調用Pet類的虛方法Speak(),根據cat所指向的派生類Cat而調用Cat里的同名重寫方法Speak()---即多態
      13           
      14 
      15         }
      16 
      17     }
      18     public class Pet
      19     {
      20         public string Name;
      21         public void PrintName()
      22         {
      23             Console.WriteLine("Print"+Name);
      24         }
      25         
      26         virtual public void Speak()//聲明了virtual的方法就是虛方法,可在派生類中override重寫
      27         {
      28             Console.WriteLine("I'm "+Name);  
      29         }
      30     }
      31     public class Dog : Pet
      32     {
      33         public Dog(string name)//構造函數
      34         {
      35             Name = name;
      36         }
      37         new public void PrintName()
      38         {
      39             Console.WriteLine("子打印"+Name);
      40         }
      41         override public void Speak()//重寫基類Pet的虛方法
      42         {
      43             Console.WriteLine("子說" + Name);
      44         }
      45     }
      46     public class Cat : Pet
      47     {
      48         public Cat(string name)//構造函數
      49         {
      50             Name = name;
      51         }
      52         new public void PrintName()
      53         {
      54             Console.WriteLine("子打印" + Name);
      55         }
      56         override public void Speak()//重寫基類Pet的虛方法
      57         {
      58             Console.WriteLine("子說" + Name);
      59         }
      60     }
      復制代碼

       以上是虛方法和多態。

      面向對象編程過程中盡量依賴抽象的類,而不要過分依賴具體類。

      基類的引用可以指向派生類。通過指向Dog類的Pet類的引用,僅能訪問Dog中繼承自Pet的部分,如下:

      復制代碼
      class Program
          {
              static void Main(string[] args)
              {
                  
                  Pet dog = new Dog("DD");//創建指向派生類Dog的基類Pet的實例,前面的Pet的位置 決定了下面引用的方法取自哪個類。
                  dog.PrintName();
                  Pet cat = new Cat("CC");//創建指向派生類Cat的基類Pet的實例
                               
                 cat.PrintName();//指向派生類Cat的對Pet的引用,訪問的是Catl里繼承自Pet的方法---基類的引用
      
              }
      
          }
          public class Pet
          {
              public string Name;
              public void PrintName()
              {
                  Console.WriteLine("Print"+Name);
              }
                   
          }
          public class Dog : Pet
          {
              public Dog(string name)//構造函數
              {
                  Name = name;
              }
              new public void PrintName()
              {
                  Console.WriteLine("子打印"+Name);
              }
            
          }
          public class Cat : Pet
          {
              public Cat(string name)//構造函數
              {
                  Name = name;
              }
              new public void PrintName()
              {
                  Console.WriteLine("子打印" + Name);
              }
             
          }

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