【C++设计模式】用简单工厂模式实现按汽车重量输出汽车类型

2023年8月24日，周四凌晨

---

#include<iostream>

class CarType{
public:
	virtual std::string getType()=0;
};

class MiniCar:public CarType{
public:
	std::string getType() override{
		return "小型车";
	};
};

class MidSizeCar:public CarType{
public:
	std::string getType() override{
		return "中型车";
	};
};

class HeavyCar:public CarType{
public:
	std::string getType() override{
		return "重型车";
	};
};

class CarTypeFactory{
public:
	CarType* createCarType(int weight){
		
		if(weight<5){
			return new MiniCar();
		}else if(weight<10){
			return new MidSizeCar();
		}else{
			return new HeavyCar();
		}
		
		return nullptr;
	}
};


int main(){
	int weight;
	CarType *carType;
	CarTypeFactory *factory=new CarTypeFactory();
	
	while(1){
		std::cout<<"请输入汽车的重量（吨）：";
		std::cin>>weight;
			
		carType=factory->createCarType(weight);
		std::cout<<carType->getType()<<std::endl;
	}
	
}