Python设计模式 之 简单工厂模式
Python简单工厂模式属于类的创建型模式，适合用来对大量具有共同接口的类进行实例化，它可以推迟到运行的时候才动态决定要创建哪个类的实例，而不是在编译时就必须知道要实例化哪个类。
Python:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
class Circle(object):
def draw(self):
print 'draw circle'
class Rectangle(object):
def draw(self):
print 'draw Rectangle'
class ShapeFactory(object):
def create(self, shape):
if shape == 'Circle':
return Circle()
elif shape == 'Rectangle':
return Rectangle()
else:
return None
fac = ShapeFactory()
obj = fac.create('Circle')
obj.draw()
c++:
#include <iostream>
#include <string.h>
using namespace std;
class Shape
{
public:
virtual void draw(){}
};
class Circle : public Shape
{
public:
void draw()
{
cout << "draw circle" << endl;
}
};
class Rectangle : public Shape
{
public:
void draw()
{
cout << "draw Rectangle" << endl;
}
};
class ShapeFactory
{
public:
static Shape* create(const char *opt)
{
if (opt == NULL)
return NULL;
if (!strcmp(opt, "Circle"))
return new Circle();
else if (!strcmp(opt, "Rectangle"))
return new Rectangle();
else
return NULL;
}
};
int main()
{
Shape *obj = ShapeFactory::create("Rectangle");
if (obj)
obj->draw();
return 0;
}
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