2023.4.25

#include <iostream>
using namespace std;
//利用多态，实现计算器
//多态的好处
//1、组织结构清晰
//2、可读性强
//3、对于前期和后期扩展以及维护性高
class AbstractCalculator
{
public:
    int m_Num1;
    int m_Num2;
    virtual int getResult()
    {
        return 0;
    }
};
class AddCalculate : public AbstractCalculator
{
    int getResult()
    {
        return m_Num1 + m_Num2;
    }
};
class SubCalculate : public AbstractCalculator
{
    int getResult()
    {
        return m_Num1 - m_Num2;
    }
};
class MulCalculate : public AbstractCalculator
{
    int getResult()
    {
        return m_Num1 * m_Num2;
    }
};
void test()
{
    //创建加法计算器
    AbstractCalculator *abc = new AddCalculate;
    abc->m_Num1 = 10;
    abc->m_Num2 = 10;
    cout<<abc->m_Num1<<" + "<<abc->m_Num2<<" = "<<abc->getResult()<<endl;
    delete abc;
    //创建加法计算器
    abc = new SubCalculate;
    abc->m_Num1 = 10;
    abc->m_Num2 = 10;
    cout<<abc->m_Num1<<" - "<<abc->m_Num2<<" = "<<abc->getResult()<<endl;
    //创建乘法计算器
    abc = new MulCalculate;
    abc->m_Num1 = 10;
    abc->m_Num2 = 10;
    cout<<abc->m_Num1<<" * "<<abc->m_Num2<<" = "<<abc->getResult()<<endl;
}
int main()
{
    test();
    return 0;
}

#include <iostream>
using namespace std;
//纯虚函数和抽象类
//多态案例-制作饮品（咖啡和茶叶）
//煮水->冲泡->倒入杯中->加入辅料
class AbstractMakeDrink
{
public:
    virtual void Boil() = 0;
    virtual void Brew() = 0;
    virtual void Pow() = 0;
    virtual void Putsth() = 0;
    void makeDrink()
    {
        Boil();
        Brew();
        Pow();
        Putsth();
    }
};
class Coffee :public AbstractMakeDrink
{
public:
    virtual void Boil()
    {
        cout<<"煮沸农夫山泉"<<endl;
    }
    virtual void Brew()
    {
        cout<<"冲泡咖啡"<<endl;
    }
    virtual void Pow()
    {
        cout<<"倒入杯中"<<endl;
    }
    virtual void Putsth()
    {
        cout<<"加入糖和牛奶"<<endl;
    }
};
class Tea :public AbstractMakeDrink
{
public:
    virtual void Boil()
    {
        cout<<"煮沸山泉"<<endl;
    }
    virtual void Brew()
    {
        cout<<"冲泡茶叶"<<endl;
    }
    virtual void Pow()
    {
        cout<<"倒入茶杯中"<<endl;
    }
    virtual void Putsth()
    {
        cout<<"加入柠檬"<<endl;
    }
};
void DoWork(AbstractMakeDrink *abs)
{
    abs->makeDrink();
}
void test()
{
    DoWork(new Coffee);
    cout<<"---------------------"<<endl;
    DoWork(new Tea);
}
int main()
{
    test();
    return 0;
}

#include <iostream>
using namespace std;
//虚析构和纯虚析构
//多态案例-电脑组装
//电脑主要组成部件CPU、显卡、内存条
//将每个零件封装出抽象类，并且提供不同的厂商生产不同的零件
//创建电脑类提供让电脑工作的函数，并且调用每个零件的接口
/////////////////////////////////////////////////////////////
//抽象不同的零件类
class CPU
{
public:
    virtual void calculate() = 0;
};
class VideoCard
{
public:
    virtual void display() = 0;
};
class Memory
{
public:
    virtual void storage() = 0;
};
//电脑类
class Computer
{
public:
    Computer(CPU* cpu,VideoCard* vc,Memory* mem)
    {
        m_cpu = cpu;
        m_vc = vc;
        m_mem = mem;
    }
    void work()
    {
        m_cpu->calculate();
        m_vc->display();
        m_mem->storage();
    }
    ~Computer()
    {
        if(m_cpu != NULL)
        {
            delete m_cpu;
            m_cpu = NULL;
        }
        if(m_vc != NULL)
        {
            delete m_vc;
            m_vc = NULL;
        }
        if(m_mem != NULL)
        {
            delete m_mem;
            m_mem = NULL;
        }
    }
private:
    CPU* m_cpu;
    VideoCard* m_vc;
    Memory* m_mem;
};
//厂商
//Intel
class IntelCPU : public CPU
{
public:
    void calculate()
    {
        cout<<"Intel的CPU开始计算"<<endl;
    }
};
class IntelMemory : public Memory
{
public:
    void storage()
    {
        cout<<"Intel的内存开始存储"<<endl;
    }
};
class IntelVideoCard : public VideoCard
{
public:
    void display()
    {
        cout<<"Intel的显卡开始显示"<<endl;
    }
};
//Lenovo
class LenovoCPU : public CPU
{
public:
    void calculate()
    {
        cout<<"Lenovo的CPU开始计算"<<endl;
    }
};
class LenovoMemory : public Memory
{
public:
    void storage()
    {
        cout<<"Lenovo的内存开始存储"<<endl;
    }
};
class LenovoVideoCard : public VideoCard
{
public:
    void display()
    {
        cout<<"Lenovo的显卡开始显示"<<endl;
    }
};
void test01()
{
    //电脑零件
     CPU * intelCPU = new IntelCPU;
     Memory * intelMem = new IntelMemory;
     VideoCard * intelCard = new IntelVideoCard;
     //创建电脑
     Computer *computer1 = new Computer(intelCPU,intelCard,intelMem);
     computer1->work();
     delete computer1;
}
int main()
{
    test01();
    return 0;
}