实现接口 [英] Implementing the Interface

问题描述

以下代码完全来自书籍示例。但仍然给我错误。我无法弄清楚出了什么问题。书也给出了输出：宝贝叫：小猫和宝贝叫：小狗。我很难理解界面，最重要的是本书的例子给我错误，任何帮助都将非常感激。

 {
  interface  ILiveBirth 
 { 
  string  BabyCalled（）; 
} 
  class  Animal {} 
  class  Cat：Animal， ILiveBirth 
 {
  string  ILiveBirth.BabyCalled（）
 { return    kitten; } 
} 
  class 狗：动物，ILiveBirth 
 {
  string  ILiveBirth.BabyCalled（）
 { return   小狗; } 
} 
  class  Bird：Animal 
 {} 
 
 类计划
 {
 静态  void  Main（） 
 {
 Animal [] animalArray =  new 动物[​​ 3 ]; 
 animalArray [ 0 ] =  new  Cat（）; 
 animalArray [ 1 ] =  new  Bird（）; 
 animalArray [ 2 ] =  new  Dog（）; 
  foreach （Animal a  in  animalArray）
 {
 ILiveBirth b =   ILiveBirth; 
  if （b！=  null ）
 Console.WriteLine（  Baby被称为：{0}，b.Babycalled（））; 
} 
} 
} 
} 

解决方案

以下代码行中有几个错误：

  if （b ！=   null ）
 Console.WriteLine（  Baby被称为：{0}，b。 Babycalled （））; 

1.应该是！= ，而不是！ = （没有空格）。

2.应该是 BabyCalled ，而不是 Babycalled （区分大小写）。



正确版本：

  if （b ！=   null ）
 Console.WriteLine（  Baby被称为：{0}，b。 BabyCalled （））; 

Below codes are exactly from book example. But still giving me errors. I couldn't figure out what is wrong. Book also gave the output: Baby is called: kitten and Baby is called: puppy. I have hard time understanding the interface, on top of that this book example is giving me error, any help will be very appreciated.

{
    interface ILiveBirth
    {
        string BabyCalled();
    }
    class Animal { }
    class Cat : Animal, ILiveBirth
    {
        string ILiveBirth.BabyCalled()
        { return "kitten"; }
    }
    class Dog : Animal, ILiveBirth
    {
        string ILiveBirth.BabyCalled()
        { return "puppy"; }
    }
    class Bird : Animal
    { }

    class Program
    {
        static void Main()
        {
            Animal[] animalArray = new Animal[3];
            animalArray[0] = new Cat();
            animalArray[1] = new Bird();
            animalArray[2] = new Dog();
            foreach(Animal a in animalArray)
            {
                ILiveBirth b = a as ILiveBirth;
                if (b ! = null)
                Console.WriteLine("Baby is called:{0}", b.Babycalled());
            }
        }
    }
}

解决方案

Hi,

There are a couple of errors in the following lines of code:

if (b ! = null)
Console.WriteLine("Baby is called:{0}", b.Babycalled());

1. Should be !=, not ! = (without a space).
2. Should be BabyCalled, not Babycalled (case sensitivity).

Correct version:

if (b != null)
Console.WriteLine("Baby is called:{0}", b.BabyCalled());

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