#include"AbstractFile.h" void AbstractFile::add(AbstractFile*)

 {

 } void AbstractFile::remove()

 {

 } void AbstractFile::display()

 {

 } #include"Folder.h"

 folder::folder(string filename)

 {

     this->filename=filename;

 } void folder::remove()

 {

 } void folder::add(AbstractFile *p)

 {

     m_vAbstractfile.push_back(p);

 } void folder::display()

 {

     cout<<"+"<<filename<<endl;

     vector<AbstractFile*>::iterator it=m_vAbstractfile.begin();

     for(;it!=m_vAbstractfile.end();++it)

     {

         (*it)->display();

     }

 }

  #include"imagefile.h"

  void imagefile::add(AbstractFile* p)

 {

 }

 imagefile::imagefile(string filename)

 {

     this->filename=filename;

 } void imagefile::remove()

 {

 } void imagefile::display()

 {

     cout<<"图片输出 "<<this->filename<<endl;

 }

  #include"videofile.h"

 videofile::videofile(string filename)

 {

     this->filename=filename;

 } void videofile::add(AbstractFile* p)

 {

 } void videofile::remove()

 {

 } void videofile::display()

 {

     cout<<"影像输出"<<this->filename<<endl;

 }

  #include<stdio.h>

 #include"AbstractFile.h"

 #include"Folder.h"

 #include"imagefile.h"

 #include"videofile.h" int main()

 {

     AbstractFile *p=new folder("folder"),*p3,*p2,*p4;

     folder *p1;

     p3=new imagefile("imagefile");

     p2=new videofile("vediofile");

     p4=new imagefile("imagefile2");

     p1=new folder("folder1");

     p->add(p3);

     p->add(p2); 

     p1->add(p4);

     p->add(p1);

     p->display(); 

     return ;

 }