#include <iostream>

using namespace std;
class SubSystemOne
{
private:
    SubSystemOne(){};
    void MethodOne(){
        cout<<"子系统方法一"<<endl;
    }
    friend class Facade;
};
class SubSystemTwo
{
private:
    SubSystemTwo(){};
    void MethodTwo(){
        cout<<"子系统方法二"<<endl;
    }
    friend class Facade;
};
class SubSystemThree
{
private:
    SubSystemThree(){};
    void MethodThree(){
        cout<<"子系统方法三"<<endl;
    }
    friend class Facade;
};
class SubSystemFour
{
private:
    SubSystemFour(){};
    void MethodFour(){
        cout<<"子系统方法四"<<endl;
    }
    friend class Facade;
};

class Facade{
    SubSystemOne one;
    SubSystemTwo two;
    SubSystemThree three;
    SubSystemFour four;

public:
    void MethodA()
    {
        cout<<"方法组A"<<endl;
        one.MethodOne();
        two.MethodTwo();
        four.MethodFour();
    }
    void MethodB()
    {
        cout<<"方法组B"<<endl;
        two.MethodTwo();
        three.MethodThree();
    }
};
int main()
{
    Facade facade;
    facade.MethodA();
    facade.MethodB();
    return 0;
}