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工厂方法模式：优化，工厂类也分子类和父类
流程：
实例：
#include <iostream>
using namespace std;
/*抽象产品类 TV(电视机类)*/
class TV
{
public:
virtual void Show() = 0;
virtual ~TV();//声明析构函数为虚函数，防止内存泄漏
};/*具体产品类 HairTV(海尔电视机类)*/
class HairTV : public TV
{
public:
void Show()
{
cout<< "I'm HairTV"<<endl;
}
};/*具体产品类 HisenseTV(海信电视机类)*/
class HisenseTV : public TV
{
public:
void Show()
{
cout<< "I'm HisenseTV"<<endl;
}
};/*工厂类(电视机工厂类)*/
class TVFactory
{
public:
virtual TV *CreateTV() = 0;
virtual ~TVFactory(){};//析构函数声明为虚函数，防止内存泄漏
};/*具体工厂类 HairTVFactory(海尔电视机工厂类)*/
class HairTVFactory : public TVFactory
{
public:
TV *CreateTV()
{
return new HairTV ();
}
};/*具体工厂类 HisenseTV(海信电视机工厂类)*/
class HisenseTVFactory : public TVFactory
{
public:
TV *CreateTV()
{
return new HisenseTV ();
}
};int main(int argc , char *argv [])
{
TVFactory *hairTVFactory = new HairTVFactory();
TV *hairTV = hairTVFactory->CreateTV();
hairTV->Show();TVFactory *hisenseTVFactory = new HisenseTVFactory();
TV *hisenseTV = hisenseTVFactory->CreateTV();
hisenseTV->Show();if (hairTVFactory!= NULL)
{
delete hairTVFactory;
hairTVFactory = NULL;
}if (hairTV != NULL)
{
delete hairTV;
hairTV = NULL;
}if (hisenseTVFactory != NULL)
{
delete hisenseTVFactory;
hisenseTVFactory = NULL;
}if (hisenseTV != NULL)
{
delete hisenseTV;
hisenseTV = NULL;
}
return 0;
}
工厂类也分为子类和父类，子类工厂专门负责生产子类产品，它们是一一对应的关系。所以，当新添加子类产品时，只需要新添加一个工厂子类即可，不需要再原来的代码上修改，从而提高了扩展性。
抽象工厂模式：一个工厂子类生产多个产品子类
流程：
实例：
HairTV 和 HairAC 都由 Hair工厂子类来生产，但注意，这两个子类产品都是Hair品牌，也就是说，它们之间是有联系的
#include <iostream>
using namespace std;// 抽象产品类类 Television(电视机类)
class Television
{
public:virtual void Show() = 0;virtual ~Television(){};//析构函数声明为虚函数，防止内存泄漏
};//具体产品类 HaierTelevision（海尔电视机类）
class HaierTelevision : public Television
{
public:void Show(){cout << "I'm HaierTelevision" << endl;}
};
//具体产品类 TCLTelevision（TCL电视机类）
class TCLTelevision : public Television
{
public:void Show(){cout << "I'm TCLTelevision" << endl;}
};// 抽象产品类 AirCondition（空调类）
class AirCondition
{
public:virtual void Show() = 0;virtual ~AirCondition(){};//析构函数声明为虚函数，防止内存泄漏
};//具体产品类 HairAirCondition(海尔空调类)
class HairAirCondition : public AirCondition
{
public:void Show(){cout << "I'm HairAirCondition" << endl;}
};//具体产品类 TCLAirCondition(TCL空调类)
class TCLAirCondition : public AirCondition
{
public:void Show(){cout << "I'm TCLAirCondition" << endl;}
};// 抽象工厂类 EFactory(电器工厂类)
class EFactory
{
public:virtual Television* CreateTelevision() = 0;virtual AirCondition* CreateAirCondition() = 0;virtual ~EFactory(){};//析构函数声明为虚函数，防止内存泄漏
};//具体工厂类 HairFactory(海尔工厂类)
class HairFactory : public EFactory
{
public:Television* CreateTelevision(){return new HaierTelevision();}AirCondition* CreateAirCondition(){return new HairAirCondition();}
};//具体工厂类 TCLFactory(TCL工厂类)
class TCLFactory : public EFactory
{
public:Television* CreateTelevision(){return new TCLTelevision();}AirCondition* CreateAirCondition(){return new TCLAirCondition();}
};int main(int argc, char *argv[])
{EFactory *hairFactory = new HairFactory ();/*实例化工厂抽象类*/Television *haierTelevision =hairFactory->CreateTelevision();/*实例化产品抽象类*/AirCondition *haierAirCondition = hairFactory->CreateAirCondition();haierTelevision->Show();haierAirCondition->Show();EFactory *tCLFactory = new TCLFactory ();Television *tCLTelevision = tCLFactory->CreateTelevision();AirCondition *tCLAirCondition = tCLFactory->CreateAirCondition();tCLTelevision->Show();tCLAirCondition->Show();if (hairFactory != NULL){delete hairFactory;hairFactory = NULL;}if (haierTelevision != NULL){delete haierTelevision;haierTelevision= NULL;}if (tCLAirCondition != NULL){delete tCLAirCondition;tCLAirCondition = NULL;}if (tCLFactory != NULL){delete tCLFactory;tCLFactory= NULL;}if (tCLTelevision != NULL){delete tCLTelevision;tCLTelevision = NULL;}if (tCLAirCondition != NULL){delete tCLAirCondition;tCLAirCondition = NULL;}
}
一个工厂子类可以生产一个产品族，抽象工厂模式适合不同类的产品之间有联系的情况