组合模式
用透明组合模式实现教材中的“文件夹浏览”这个例子。
类图
java
package rjsj.no10;
public class Client {
public static void main(String[] args) {
AbstractFile obj1,obj2,obj3,obj4,obj5;
Folder plate1,plate2,plate3;
obj1 = new ImageFile("图片文件1");
obj2 = new TextFile("文本文件1");
plate1 = new Folder("父文件夹1");
plate1.add(obj1);
plate1.add(obj2);
obj3 = new VideoFile("视频文件1");
obj4 = new Folder("子文件夹1");
plate2 = new Folder("父文件夹2");
plate2.add(obj3);
plate2.add(obj4);
obj5 = new TextFile("文本文件2");
plate3 = new Folder("父文件夹3");
plate3.add(obj5);
plate3.add(plate1);
plate3.add(plate2);
plate3.display();
}
}
package rjsj.no10;
import java.util.ArrayList;
public class Folder extends AbstractFile{
private String fileName;
private ArrayList fileList=new ArrayList();
public Folder(String filename) {
this.fileName=new String();
this.fileName=filename;
}
@Override
public void add(AbstractFile element) {
fileList.add(element);
System.out.println("新建文件夹");
}
@Override
public void remove(AbstractFile element) {
fileList.remove(element);
System.out.println("删除文件夹");
}
@Override
public void display() {
for (Object obj:fileList){
((AbstractFile)obj).display();
}
System.out.println("打开文件夹");
}
}
package rjsj.no10;
public class ImageFile extends AbstractFile{
private String fileName;
public ImageFile(String filename) {
this.fileName=new String();
this.fileName=filename;
}
@Override
public void add(AbstractFile element) {
System.out.println("添加图片文件");
}
@Override
public void remove(AbstractFile element) {
System.out.println("移除图片文件");
}
@Override
public void display() {
System.out.println(fileName);
System.out.println("打开图片文件");
}
}
package rjsj.no10;
public class TextFile extends AbstractFile{
private String fileName;
public TextFile(String filename) {
this.fileName=new String();
this.fileName=filename;
}
@Override
public void add(AbstractFile element) {
System.out.println("添加文本文件");
}
@Override
public void remove(AbstractFile element) {
System.out.println("移除文本文件");
}
@Override
public void display() {
System.out.println(fileName);
System.out.println("打开文本文件");
}
}
package rjsj.no10;
public class VideoFile extends AbstractFile{
private String fileName;
public VideoFile(String filename) {
this.fileName=new String();
this.fileName=filename;
}
@Override
public void add(AbstractFile element) {
System.out.println("添加视频文件");
}
@Override
public void remove(AbstractFile element) {
System.out.println("移除视频文件");
}
@Override
public void display() {
System.out.println(fileName);
System.out.println("播放视频文件");
}
}
package rjsj.no10;
public abstract class AbstractFile {
public abstract void add(AbstractFile element);
public abstract void remove(AbstractFile element);
public abstract void display();
}
C++
#include<iostream>
#include<string>
#include<list>
using namespace std;
class AbstractFile {
public:
virtual void add(AbstractFile* element) = 0;
virtual void remove(AbstractFile* element) = 0;
virtual void display() = 0;
};
class VideoFile : public AbstractFile {
private:
string fileName;
public:
VideoFile(string fileName) {
this->fileName = fileName;
}
void add(AbstractFile* element) {
cout << "打开VideoFile" << endl;
}
void remove(AbstractFile* element) {
cout << "关闭VideoFile" << endl;
}
void display() {
cout << "浏览VideoFile" << endl;
}
void displayFile() {
cout << "VideoFile的内容" << endl;
}
};
class TextFile :public AbstractFile {
private:
string fileName;
public:
TextFile(string fileName) {
this->fileName = fileName;
}
void add(AbstractFile* element) {
cout << "打开" <<this->fileName<< endl;
}
void remove(AbstractFile* element) {
cout << "关闭" << this->fileName<<endl;
}
void display() {
cout << "浏览" << this->fileName<<endl;
}
void displayFile() {
cout <<this->fileName<< "的内容" << endl;
}
};
class ImageFile :public AbstractFile {
private:
string fileName;
public:
ImageFile(string fileName) {
this->fileName = fileName;
}
void add(AbstractFile* element) {
cout << "打开" <<this->fileName<< endl;
}
void remove(AbstractFile* element) {
cout << "关闭"<<this->fileName << endl;
}
void display() {
cout << "浏览"<<this->fileName << endl;
}
void displayFile() {
cout <<this->fileName<< "的内容" << endl;
}
};
class Folder :public AbstractFile {
private:
list<AbstractFile*>* _list;
string fileName;
public:
Folder(string fileName) {
this->fileName = fileName;
_list = new list<AbstractFile*>;
}
~Folder() {
if (_list != NULL)
{
while (_list->empty()) {
delete *(_list->begin());
_list->erase(_list->begin());
}
delete _list;
}
}
string getFileName() const {
return fileName;
}
void add(AbstractFile* element) {
_list->push_back(element);
}
void remove(AbstractFile* element) {
cout << "关闭"<<this->fileName;
_list->remove(element);
}
void display() {
if (_list != NULL) {
list<AbstractFile*>::iterator it = _list->begin();
while (it != _list->end()) {
(*it++)->display();
}
}
}
};
int main() {
AbstractFile *obj1, *obj2, *obj3, *obj4;
Folder *plate1, *plate2;
obj1 = new ImageFile("ImageFile");
obj2 = new TextFile("TextFile");
plate1 = new Folder("folder1");
cout << "打开Folder1";
plate1->add(obj1);
plate1->add(obj2);
plate1->display();
obj3 = new VideoFile("VideoFile");
cout << "打开Folder2";
plate2 = new Folder("folder2");
plate2->add(obj3);
plate2->display();
plate1->remove(obj1);
plate1->remove(obj3);
}
运行截图
