组合模式-实现文件夹浏览

用透明组合模式实现教材中的“文件夹浏览”这个例子。

 

 

 java代码

AbstractFile

public abstract class AbstractFile {

    public abstract void add(AbstractFile ele);
    public abstract void remove(AbstractFile ele);
    public abstract void display();

}

Folder

import java.util.ArrayList;

public class Folder extends AbstractFile{

    private String filename;
    private ArrayList al=new ArrayList<>();
    

    public Folder(String f) {
        filename=f;
    }
    @Override
    public void add(AbstractFile ele) {
        // TODO Auto-generated method stub
        al.add(ele);
        System.out.println("Folder add");
    }

    @Override
    public void remove(AbstractFile ele) {
        // TODO Auto-generated method stub
        al.remove(ele);
        System.out.println("Folder remove");
    }

    @Override
    public void display() {
        // TODO Auto-generated method stub
        for(Object object:al)
        {
            ((AbstractFile)object).display();
        }
        System.out.println("Folder:display");

    }

}

ImageFile

public class ImageFile extends AbstractFile{

    private String filename;
    
    public ImageFile(String f) {
        filename=f;
    }
    @Override
    public void add(AbstractFile ele) {
        // TODO Auto-generated method stub
        System.out.println("添加Image文件");
    }

    @Override
    public void remove(AbstractFile ele) {
        // TODO Auto-generated method stub
        System.out.println("删除Image文件");
    }

    @Override
    public void display() {
        // TODO Auto-generated method stub
        System.out.println("展示Image文件"+filename);
    }

}

TextFile

public class TextFile extends AbstractFile{

    private String filename;
    
    public TextFile(String f) {
        filename=f;
    }
    @Override
    public void add(AbstractFile ele) {
        // TODO Auto-generated method stub
        System.out.println("添加Text文件");
    }

    @Override
    public void remove(AbstractFile ele) {
        // TODO Auto-generated method stub
        System.out.println("删除Text文件");
    }

    @Override
    public void display() {
        // TODO Auto-generated method stub
        System.out.println("展示Text文件"+filename);
    }

}

VideoFile

public class VideoFile extends AbstractFile{

    private String filename;
    
    public VideoFile(String f) {
        filename=f;
    }
    @Override
    public void add(AbstractFile ele) {
        // TODO Auto-generated method stub
        System.out.println("添加Video文件");
    }

    @Override
    public void remove(AbstractFile ele) {
        // TODO Auto-generated method stub
        System.out.println("删除Video文件");
    }

    @Override
    public void display() {
        // TODO Auto-generated method stub
        System.out.println("展示Video文件"+filename);
    }

}

Cient

public class Client {
    public static void main(String a[])
    {
        AbstractFile obj1,obj2,obj3,obj4,obj5;
        Folder plate1,plate2,plate3;
        obj1=new ImageFile("aaa.png");
        obj2=new TextFile("bbb.txt");
        plate1=new Folder("ccc");
        plate1.add(obj1);
        plate1.add(obj2);
        
        obj3=new VideoFile("ddd.mp3");
        obj4=new VideoFile("eee.mp3");
        plate2=new Folder("fff");
        plate2.add(obj3);
        plate2.add(obj4);
        
        obj5=new ImageFile("ggg.jpg");
        plate3=new Folder("hhh");
        plate3.add(plate1);
        plate3.add(plate2);
        plate3.add(obj5);
        
        plate3.display();
  }
}

c++代码

#include<iostream>
#include<string>
#include<vector>
using namespace std;
class AbstractFile {

public: virtual void add(AbstractFile *ele)=0;
        virtual void remove(AbstractFile *ele)=0;
         virtual void display()=0;

};
class TextFile :public AbstractFile{

private: string filename;

public: TextFile(string f) {
        filename = f;
    }
       void add(AbstractFile *ele) {
        // TODO Auto-generated method stub
        cout<<"添加Text文件"<<endl;
    }

        void remove(AbstractFile *ele) {
        // TODO Auto-generated method stub
        cout<<"删除Text文件"<<endl;
    }
        void display() {
        // TODO Auto-generated method stub
        cout<<"展示Text文件"<< filename<<endl;
    }

};
class ImageFile :public AbstractFile{

private: string filename;

public: ImageFile(string f) {
    filename = f;
}
        void add(AbstractFile *ele) {
            // TODO Auto-generated method stub
            cout << "添加Image文件" << endl;
        }

        void remove(AbstractFile *ele) {
            // TODO Auto-generated method stub
            cout << "删除Image文件" << endl;
        }
        void display() {
            // TODO Auto-generated method stub
            cout << "展示Image文件" << filename << endl;
        }

};
class VideoFile :public AbstractFile{

private: string filename;

public: VideoFile(string f) {
    filename = f;
}
        void add(AbstractFile *ele) {
            // TODO Auto-generated method stub
            cout << "添加Video文件" << endl;
        }

        void remove(AbstractFile *ele) {
            // TODO Auto-generated method stub
            cout << "删除Video文件" << endl;
        }
        void display() {
            // TODO Auto-generated method stub
            cout << "展示Video文件" << filename << endl;
        }

};
class Folder:public AbstractFile{

private: string filename;
private:vector<AbstractFile* > va;

public: Folder(string f) {
        filename = f;
    }
        void add(AbstractFile *ele) {
        // TODO Auto-generated method stub
        va.push_back(ele);
        cout<<"Folder add"<<endl;
    }
     void remove(AbstractFile *ele) {
        // TODO Auto-generated method stub
         vector<AbstractFile* >::iterator it;
         it = find(va.begin(), va.end(), ele);
         for (it != va.end();;){
             va.erase(it);
         }
        cout<<"Folder remove"<<endl;
    }
        void display() {
        // TODO Auto-generated method stub
        for (vector<AbstractFile*>::const_iterator iter = va.begin(); iter != va.cend(); iter++) {
            (*iter)->display();
            }
        cout<<"Folder:display"<<endl;

    }

};
int main(){
    AbstractFile *obj1, *obj2, *obj3, *obj4, *obj5;
    Folder *plate1, *plate2, *plate3;
    obj1 = new ImageFile("aaa.png");
    obj2 = new TextFile("bbb.txt");
    plate1 = new Folder("ccc");
    plate1->add(obj1);
    plate1->add(obj2);

    obj3 = new VideoFile("ddd.mp3");
    obj4 = new VideoFile("eee.mp3");
    plate2 = new Folder("fff");
    plate2->add(obj3);
    plate2->add(obj4);

    obj5 = new ImageFile("ggg.jpg");
    plate3 = new Folder("hhh");
    plate3->add(plate1);
    plate3->add(plate2);
    plate3->add(obj5);

    plate3->display();

}