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【设计模式】——简单工厂模式

2024-07-08 18:41:03   215人阅读

　　简单工厂模式没有抽象类，只有一个具体工厂类，所有产品的生产都由这个工厂类的对象来负责，如果这个工厂类中生产产品的方法被声明为静态的，那么连这个工厂对象也不是必须的了，直接使用工厂类名就可以调用生产方法。生产方法被声明为静态的，所以简单工厂模式也叫静态工厂模式。简单工厂模式并不是一个好的设计模式，因为它不符合开闭原则。

 

#include <iostream>using namespace std;class Operation{private:    double _numberA;    double _numberB;public:    Operation(){}    Operation(double numA,double numB):_numberA(numA),_numberB(numB){}    void set_numberA(double numA)    {        _numberA=numA;    }    double get_numberA()    {        return _numberA;    }    void set_numberB(double numB)    {        _numberB=numB;    }    double get_numberB()    {        return _numberB;    }    virtual double GetResult()    {        double result=0;        return result;    }};//加减乘除类class OperationAdd:public Operation{public:    OperationAdd(){}    OperationAdd(double numA,double numB):Operation(numA,numB){}    double GetResult()    {        double result=0;        result=get_numberA()+get_numberB();        return result;    }};class OperationSub:public Operation{public:    OperationSub(){}    OperationSub(double numA,double numB):Operation(numA,numB){}    double GetResult()    {        double result=0;        result=get_numberA()-get_numberB();        return result;    }};class OperationMul:public Operation{public:    OperationMul(){}    OperationMul(double numA,double numB):Operation(numA,numB){}    double GetResult()    {        double result=0;        result=get_numberA()*get_numberB();        return result;    }};class OperationDiv:public Operation{public:    OperationDiv(){}    OperationDiv(double numA,double numB):Operation(numA,numB){}    double GetResult()    {        double result=0;        if(get_numberB()==0)        {            cout << "除数不能为0" << endl;            return -1;        }        result=get_numberA()/get_numberB();        return result;    }};//简单运算工厂类class OperationFactory{public:    Operation *CreateOperate(char operate)    {        Operation *oper=NULL;        switch(operate)        {        case ‘+‘:            oper=new OperationAdd();            break;        case ‘-‘:            oper=new OperationSub();            break;        case ‘*‘:            oper=new OperationMul();            break;        case ‘/‘:            oper=new OperationDiv();            break;        default:            break;        }        return oper;    }};int main(){    Operation *oper;    OperationFactory operFactory;    oper=operFactory.CreateOperate(‘+‘);    oper->set_numberA(1);    oper->set_numberB(2);    double result=oper->GetResult();    cout << "result=" << result << endl;    return 0;}

 


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