简单工厂模式

#include "stdafx.h"

class Method
{
private:
        int _Num1;
        int _Num2;
public:
       Method( int number1 = 0, int number2 = 0)
              :_Num1( number1), _Num2( number2)
       {}
        virtual ~Method()
       {}

        int GetNum1(){ return _Num1; }
        int GetNum2(){ return _Num2; }
        void SetNum1( int number1){ _Num1 = number1; }
        void SetNum2( int number2){ _Num2 = number2; }

        virtual int Operator() = 0;
};

class ConcreteMethod1 :public Method
{
public:
       ConcreteMethod1( int number1 = 0, int number2 = 0) :
               Method( number1, number2)
       {}

        virtual int Operator()
       {
               return GetNum1() + GetNum2();
       }
};


class ConcreteMethod2 :public Method
{
public:
       ConcreteMethod2( int number1 = 0, int number2 = 0) :
               Method( number1, number2)
       {}

        virtual int Operator()
       {
               return GetNum1() - GetNum2();
       }
};

class Factory
{
public:
        static Method* Create( int style)
       {
               Method *me = NULL;
               switch ( style)
              {
               case 1:
                     me = new ConcreteMethod1();
                      break;
               case 2:
                     me = new ConcreteMethod2();
                      break;
               default:
                      break;
              }
               return me;
       }
};

// FactoryMethod.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "Factory.h"
#include <iostream>
using namespace std;

int _tmain (int argc , _TCHAR * argv [])
{
        Method * me= NULL;
        Factory fc;
       me = fc.Create(1);
       me->SetNum1(1);
       me->SetNum2(2);
       cout << "result:" << me->Operator() << endl;
       getchar();
        return 0;
}