开发日志：设计模式之简易工厂模式解析与应用

简单工厂模式优点:
1.客户端和具体实现解耦

2.对于某些对象的创建过程比较复杂的情况&＃xff0c;我们不用考虑这些。

简单工厂模式缺点:
1.简单工厂模式&＃xff0c;增加新的功能是通过修改源代码实现&＃xff0c;不符合开闭原则。

2.这个工厂(类)职责过重&＃xff0c;这个工厂(类)发生问题&＃xff0c;会影响很多使用这个工厂(类)的模块

代码如下:

#include <iostream>
using namespace std;
class AbstratctFruit
{
public:
virtual void showName() &＃61; 0;
};
class Apple :public AbstratctFruit
{
public:
virtual void showName()
{
cout << "我是苹果" << endl;
}
};
class Banana :public AbstratctFruit
{
public:
virtual void showName()
{
cout << "我是香蕉" << endl;
}
};
class Pear :public AbstratctFruit
{
public:
virtual void showName()
{
cout << "我是梨子" << endl;
}
};
//水果工厂
class FruitFactor
{
public:
static AbstratctFruit * CreateFruit(string flag)
{
if (flag &＃61;&＃61; "apple") return new Apple;
else if (flag &＃61;&＃61; "banana") return new Banana;
else if (flag &＃61;&＃61; "pear") return new Pear;
else return nullptr;
}
};
void test01()
{
AbstratctFruit *fruit &＃61; FruitFactor::CreateFruit("apple");
fruit->showName();
delete fruit;
fruit &＃61; FruitFactor::CreateFruit("banana");
fruit->showName();
delete fruit;
fruit &＃61; FruitFactor::CreateFruit("pear");
fruit->showName();
delete fruit;
}
int main()
{
test01();
return 0;
}


测试结果: