OO设计原则

Tue, 27 May 2008 19:11:00 GMT

开闭原则（OCP�Q�：�Ҏ��展开放，对修改封�?br>里氏代换原则�Q�LSP�Q�：子类可替换父�c�，反之不行
依赖倒置原则�Q�DIP�Q�：依赖于抽象而不是依赖与具体
接口隔离原则�Q�ISP�Q�：多个专门接口比一个��L��口好
合成/聚合复用原则�Q�CARP�Q�：��量使用合成/聚合�Q�而不是��?br>�q�米�Ҏ��则（LoD�Q�：不要和陌生�h说话

安帛�?/a> 2008-05-28 03:11 发表评论

Command模式

Mon, 21 May 2007 15:32:00 GMT

摘要: Command模式的目的是��Z��使命令请求方与命令的执行方解耦合�?
因解耦合可得到的好处是：1. 增加新的具体命��o不媄响其他的�c�；2. 可以把多个命令聚合在一��L��成命令队列�?
Command模式的缺点：使用命��o模式会导致某些系�l�有�q�多的具体命令类�?
阅读全文

安帛�?/a> 2007-05-21 23:32 发表评论

Sun, 25 Mar 2007 15:20:00 GMT

工厂�Ҏ��和抽象工厂实际上是从不同角度在描�q�问题�?br />工厂�Ҏ��描述了具体��品的创徏�Q�而抽象工厂描�q�的是��品系列的�l�织�?/p>

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

#include " stdafx.h "
#include < string >
#include < iostream >

using namespace std;

class Ram {} ;
class IBMRam: public Ram {} ;
class HPRam: public Ram {} ;
class Cpu {} ;
class IBMCpu: public Cpu {} ;
class HPCpu: public Cpu {} ;

class Computer
{
public :
Computer( string strName, Ram * pRam, Cpu * pCpu)
{
  m_strName = strName;
  m_pRam = pRam;
  m_pCpu = pCpu;
  cout << " A " << m_strName << " computer is produced " << endl;
}
~ Computer()
{
  delete m_pRam;
  delete m_pCpu;
  cout << " A " << m_strName << " computer is deleted " << endl;
}
public :
string m_strName;
private :
Ram * m_pRam;
Cpu * m_pCpu;
} ;

class ComputerProducer
{
public :
Computer * createComputer()
{
   return new Computer(setName(), createRam(), createCpu());
}
virtual Ram * createRam() = 0 ;
virtual Cpu * createCpu() = 0 ;
virtual string setName() = 0 ;
} ;

class IBMProducer: public ComputerProducer
{
public :
virtual Ram * createRam()
{
  cout << " A IBMRam is producted " << endl;
   return new IBMRam;
}
virtual Cpu * createCpu()
{
  cout << " A IBMCPU is producted " << endl;
   return new IBMCpu;
}
virtual string setName()
{
   return string ( " IBM " );
}
} ;

class HPProducer: public ComputerProducer
{
public :
virtual Ram * createRam()
{
  cout << " A HPRam is producted " << endl;
   return new HPRam;
}
virtual Cpu * createCpu()
{
  cout << " A HPCPU is producted " << endl;
   return new HPCpu;
}
virtual string setName()
{
   return string ( " HP " );
}
} ;

int main( int argc, char * argv[])
{
// client code
ComputerProducer * pIBMFac = new IBMProducer;
ComputerProducer * pHPFac = new HPProducer;
Computer * pIBMComputer = pIBMFac -> createComputer();
Computer * pHPComputer = pHPFac -> createComputer();
delete pIBMComputer;
delete pHPComputer;
delete pIBMFac;
delete pHPFac;
return 0 ;
}

�q�个例子比较清楚了，不同的工厂生产不同的计算机，但计��机的基本组�?�q�里假设计算��Z��由ram和cpu�l�成)是一��L��Q�这��L��产品�p�d��很适合用抽象工厂来�l�织�?br />而在实际生��计算机的时候，createRam()和createCpu()�q�两个工厂方法又起到了作用�?br />

安帛�?/a> 2007-03-25 23:20 发表评论

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OO设计原则

Command模式