简单工厂模式

UML类图:

代码示例：

    //基类
    public abstract class Animal
    {
        public string Name { get; set; }
        public abstract void Run();
    }
    //子类1
    public class Chicken : Animal
    {
        public override void Run()
        {
            Console.WriteLine("Chicken was running...");
        }
    }
    //子类2
    public class Dog : Animal
    {
        public override void Run()
        {
            Console.WriteLine("Dog was running...");
        }
    }
    //工厂类
    public class AnimalFactory
    {
        public Animal CreateAnimal(string animalType)
        {
            switch (animalType) //依靠字符串分类
            {
                case "chicken":
                    return new Chicken();
                case "dog":
                    return new Dog();
                default:
                    throw new Exception("Invalid param...");
            }
        }
    }

 

Python代码：

>>> class Human:
... 	def GetDailyLife(self):
... 		raise NotImplimentedError("Abstract")
... 	
>>> class Man(Human):
... 	def GetDailyLife(self):
... 		return "Sure to game, playing and so on."
... 	
>>> class Woman(Human):
... 	def GetDailyLife(self):
... 		return "Shopping..."
... 	
>>> class HumanFactory:
... 	def GetHumanInstance(self, humanStr):
... 		if(humanStr=="man"):
... 			return Man()
... 		elif(humanStr=="woman"):
... 			return Woman()
... 		else:
... 			return None
... 		
>>> humanInstance=HumanFactory().GetHumanInstance('man')
>>> humanInstance.GetDailyLife()
'Sure to game, playing and so on.'
>>> humanInstance=HumanFactory().GetHumanInstance('woman')
>>> humanInstance.GetDailyLife()
'Shopping...'
>>>