#include <iostream>
#include<vector>
#include<string>

using namespace std;

class AbstractFile{
	protected:
		string name;
	public: 
	    AbstractFile(string n){
	    	name=n;
	    } 
	    virtual void Display()=0; // 纯虚函数
		 
}; 
class File:public AbstractFile{
	public:
	
		File(string n):AbstractFile(n){}
		
		void Display(){
			cout<<name<<endl;
		}
};
class Folder:public AbstractFile{
	private:
		vector<AbstractFile *> objvec;  //迭代器 
	public:
		Folder(string n):AbstractFile(n){}
		void add(AbstractFile *t){
			objvec.push_back(t);
		}
		void Display(){
			vector<AbstractFile *>::iterator ivec; 
			cout<<name<<endl;
			for(ivec=objvec.begin();ivec<objvec.end();ivec++)
			   (*ivec)->Display();
		}
};
int main(int argc, char** argv) {
      Folder *root=new Folder("C:\\");
      File *pa=new File("a.txt");
      File *pb=new File("b.txt");
      Folder *paa=new Folder("aa");
      File *p1=new File("1.cpp");
      File *p2=new File("2.cpp");
      root->add(pa);
      root->add(pb);
      root->add(paa);
      paa->add(p1);
      paa->add(p2);
      
      root->Display(); //调用Display（） 
      
      delete  root;
      delete pa ;
      delete pb ;
      delete  p1;
      delete  p2;
      delete  paa;
                     
      
	return 0;
}