设计模式之简单工厂模式

就是所有的类都在一个工厂内实现，显得臃肿
#include<iostream>
using namespace std;
#include<string>

//抽象水果
class abstractFruit{
public:
	virtual void showName()=0;
};
//苹果
class apple:public abstractFruit{
public:
	virtual void showName()
	{
		cout<<"apple"<<endl;
	}
};
//梨
class pear:public abstractFruit{
public:
	virtual void showName()
	{
		cout<<"pear"<<endl;
	}
};
//香蕉
class banana:public abstractFruit{
public:
	virtual void showName()
	{
		cout<<"banana"<<endl;
	}
};
//水果工厂
class fruitFactory{
public:
	static abstractFruit* createFruit(string s)
	{
		if(s=="apple"){
			return new apple;
		}else if(s=="pear"){
			return new pear;
		}else if(s=="banana"){
			return new banana;
		}else{
			return NULL;
		}
	}
};
int main()
{
	fruitFactory *ff=new fruitFactory;
	abstractFruit* ap=ff->createFruit("apple");
	ap->showName();
	abstractFruit* pr=ff->createFruit("pear");
	pr->showName();
	abstractFruit* ba=ff->createFruit("banana");
	ba->showName();
	delete ap;
	delete pr;
	delete ba;
	delete ff;
	return 0;
}