设计模式的基本组成和基本目的：
1.命名规范
2.减少不必要的判断 ，尽量让计算机少做无用功
3.注意异常case
封装 继承 多态
紧耦合 和 松耦合
第一个设计模式; 简单工厂模式
类图：
简单工厂类：
.h文件
/* * OperationFactory.h * * Created on: 2018年4月2日 * Author: jiangshang */
#include#include#include#include "simpleFactroy.h"
using namespace std;
enum OPERATE{
};
#ifndef OPERATIONFACTORY_H_
#define OPERATIONFACTORY_H_
class OperationFactory {
public:
OperationFactory();
~OperationFactory();
static Operation* createOperate(string operate);
};
#endif /* OPERATIONFACTORY_H_ */
.cpp文件以及main函数入口
/*
* OperationFactory.cpp
*
* Created on: 2018年4月2日
* Author: jiangshang
*/
#include "OperationFactory.h"
#include "SimpleFactoryAdd.h"
#include "SimpleFactoryDev.h"
#include "SimpleFactorySub.h"
#include "SimpleFactoryMul.h"
OperationFactory::OperationFactory() {
}
OperationFactory::~OperationFactory() {
}
Operation* OperationFactory::createOperate(string operate) {
Operation *ope = NULL;
int operateNum = 0;
if (operate == "+")
{
operateNum = 1;
}
else if (operate == "-"){
operateNum = 2;
}
else if (operate == "*"){
operateNum = 3;
}
else if (operate == "/"){
operateNum = 4;
}
switch (operateNum) {
case 1:
ope = new SimpleFactoryAdd();
break;
case 2:
ope = new SimpleFactorySub();
break;
case 3:
ope = new SimpleFactoryMul();
break;
case 4:
ope = new SimpleFactoryDev();
break;
default:
break;
}
return ope;
}
int main()
{
Operation* oper = NULL;
oper = OperationFactory::createOperate("+");
oper->setA(3);
oper->setB(4);
double result = oper->getResult();
cout<<result<<endl;
return 0
运算类：
.h文件
#ifndef SIMPLEFACTROY_H_
#define SIMPLEFACTROY_H_
class Operation {
private:
double numberA;
double numberB;
public:
Operation() ;
~Operation();
double getA();
void setA(double value);
double getB();
void setB(double value);
virtual double getResult(){};
};
.cpp文件
#include "simpleFactroy.h"
Operation::Operation():numberA(0),numberB(0)
{
}
Operation::~Operation(){}
double Operation::getA()
{
return numberA;
}
void Operation::setA(double value)
{
this->numberA = value;
}
double Operation::getB()
{
return numberB;
}
void Operation::setB(double value)
{
this->numberB = value;
}
加法类：
.h
#ifndef SIMPLEFACTORYADD_H_
#define SIMPLEFACTORYADD_H_
#include "simpleFactroy.h"
class SimpleFactoryAdd: public Operation {
public:
SimpleFactoryAdd();
~SimpleFactoryAdd();
double getResult();
};
#endif /* SIMPLEFACTORYADD_H_ */
.cpp
#include "SimpleFactoryAdd.h"
SimpleFactoryAdd::SimpleFactoryAdd()
{
}
SimpleFactoryAdd::~SimpleFactoryAdd()
{
}
double SimpleFactoryAdd::getResult()
{
double result = 0;
result = getA() + getB();
return result;
}
除法类：
.h
#ifndef SIMPLEFACTORYDEV_H_
#define SIMPLEFACTORYDEV_H_
#include "simpleFactroy.h"
class SimpleFactoryDev: public Operation {
public:
SimpleFactoryDev();
~SimpleFactoryDev();
double getResult();
};
#endif /* SIMPLEFACTORYDEV_H_ */
.cpp
#include "SimpleFactoryDev.h"
SimpleFactoryDev::SimpleFactoryDev()
{
}
SimpleFactoryDev::~SimpleFactoryDev()
{
}
double SimpleFactoryDev::getResult()
{
double result = 0;
result = getA() + getB();
return result;
}
减法类：
.h
#ifndef SIMPLEFACTORYSUB_H_
#define SIMPLEFACTORYSUB_H_
#include "simpleFactroy.h"
class SimpleFactorySub: public Operation {
public:
SimpleFactorySub();
~SimpleFactorySub();
double getResult();
};
#endif /* SIMPLEFACTORYSUB_H_ */
.cpp
#include "SimpleFactorySub.h"
SimpleFactorySub::SimpleFactorySub()
{
}
SimpleFactorySub::~SimpleFactorySub()
{
}
double SimpleFactorySub::getResult()
{
double result = 0;
result = getA() + getB();
return result;
}
乘法类：
.h
#ifndef SIMPLEFACTORYMul_H_
#define SIMPLEFACTORYMul_H_
#include "simpleFactroy.h"
class SimpleFactoryMul: public Operation {
public:
SimpleFactoryMul();
~SimpleFactoryMul();
double getResult();
};
#endif /* SIMPLEFACTORYMul_H_ */
.cpp
#include "SimpleFactoryMul.h"
SimpleFactoryMul::SimpleFactoryMul()
{
}
SimpleFactoryMul::~SimpleFactoryMul()
{
}
double SimpleFactoryMul::getResult()
{
double result = 0;
result = getA() + getB();
return result;
}
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