最简单的工厂设计模式 Factory

using System;
class A
{
public static void Main(String [] args)
{
string FruitName = Console.ReadLine();

IFruit MyFruit = null;

FruitFactory MyFruitFactory = new FruitFactory();

switch (FruitName)

{

　 case "Orange":

MyFruit = MyFruitFactory.MakeOrange();

break;

　 case "Apple":

MyFruit = MyFruitFactory.MakeApple();

break;

　 default:

break;

}

}
}

public class FruitFactory

{

　 public Orange MakeOrange()

　 {

return new Orange();

　 }

　 public Apple MakeApple()

　 {

return new Apple();

　 }

}

public interface IFruit

{

}

public class Orange:IFruit

{

　 public Orange()

　 {

Console.WriteLine("An orange is got!");

　 }

}

public class Apple:IFruit

{

　 public Apple()

　 {

Console.WriteLine("An apple is got!");

　 }

}