實例1

#include <iostream>using namespace std;class Base //基類 { public:virtual void print(){cout << "Base show()" << endl;}; };class Derived_A : public Base //派生類A { public:void print(){cout << "Derived_A show()" << endl;}; };class Derived_B : public Base //派生類B { public:void print(){cout << "Derived_B show()" << endl;}; };class Factory //工廠 { public:Base *CreateApi( int flag ); };Base *Factory::CreateApi( int flag ) {if( 1 == flag ){return new Derived_A();}else if ( 2 == flag ){return new Derived_B();} }Base *CreateProduction( int flag ) {if( 1 == flag ){return new Derived_A();}else if ( 2 == flag ){return new Derived_B();} }int main() {Base *p = NULL;//Factory f;// p = f.CreateApi( 1 );p = CreateProduction( 1 );p->print(); }

實例2

#include<iostream> #include<string>using namespace std;class Animal{ protected: char * pos; public: void printLivingPosition(){ cout << "I live in the " << pos << endl;} };class Bird : public Animal{ public: Bird(){ pos = "Sky";} };class Fish : public Animal{ public: Fish(){ pos = "Sea";} };class AnimalFactory{ // 簡單工廠 public:static Animal* createAnimal(string kind){if(strcmp("Fish",kind.c_str()) == 0)return new Fish();else if(strcmp("Bird",kind.c_str()) == 0)return new Bird();elsereturn NULL;} }; int main(){Animal *a = AnimalFactory::createAnimal("Fish"); // 使用工廠進行實例化，完成多態a->printLivingPosition();Animal *b = AnimalFactory::createAnimal("Bird");b->printLivingPosition();delete(a);delete(b);return 0; }

實例3

AbstractProduct.h

#ifndef _ABSTRACTPRODUCT_H_ #define _ABSTRACTPRODUCT_H_#include <stdio.h>class AbstractProduct{public:AbstractProduct();virtual ~AbstractProduct();public:virtual void operation() = 0; };class ProductA:public AbstractProduct{public:ProductA();virtual ~ProductA();public:void operation(); };class ProductB:public AbstractProduct{public:ProductB();~ProductB();public:void operation(); };#endif
AbstractProduct.cpp

#include "AbstractProduct.h"AbstractProduct::AbstractProduct(){ }AbstractProduct::~AbstractProduct(){ }ProductA::ProductA(){ }ProductA::~ProductA(){ }void ProductA::operation(){fprintf(stderr,"productA operation!\n"); }ProductB::ProductB(){ }ProductB::~ProductB(){ }void ProductB::operation(){fprintf(stderr,"productB operation!\n"); }
SimpleFactory.h

#ifndef _SIMPLEFACTORY_H_ #define _SIMPLEFACTROY_H_#include <stdio.h> #include "AbstractProduct.h"class AbstractFactory{public:AbstractFactory();virtual ~AbstractFactory();public:virtual AbstractProduct* createProduct(int type) = 0; };class SimpleFactory:public AbstractFactory{public:SimpleFactory();~SimpleFactory();public:AbstractProduct* createProduct(int type); };#endif
SimpleFactory.cpp

#include "SimpleFactory.h"AbstractFactory::AbstractFactory(){ }AbstractFactory::~AbstractFactory(){ }SimpleFactory::SimpleFactory(){ }SimpleFactory::~SimpleFactory(){ }AbstractProduct* SimpleFactory::createProduct(int type){AbstractProduct* temp = NULL;switch(type){case 1:temp = new ProductA();break;case 2:temp = new ProductB();break;default:break;}return temp; }
client.cpp

#include "SimpleFactory.h"int main(){AbstractFactory* factory = new SimpleFactory();AbstractProduct* product = factory->createProduct(1);product->operation();delete product;product = NULL;product = factory->createProduct(2);product->operation();delete product;product = NULL;return 0; }

總結

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