组合模式实例之文件浏览

来源：互联网发布：龟头增大知乎编辑：程序博客网时间：2024/06/05 02:21

一.实例说明：

文件有不同的类型，不同类型的文件其浏览方式有所区别，如文本文件和图片文件的浏览方式就不同。对文件夹的浏览实际上就是对其中所包含文件的浏览，而客户端可以一致地对文件和文件进行操作，无须关心它们的区别。使用组合模式来浏览文件的浏览操作。

二.实例类图：

代码：

package MyElement;

public abstract class AbstractFile {public abstract void add(AbstractFile element);public abstract void remove(AbstractFile element);public abstract void display();}

package feaffile;

class Video:

import MyElement.AbstractFile;public class VideoFile extends AbstractFile{private String fileName;public VideoFile(String filename){this.fileName=new String();this.fileName=filename;}public void add(AbstractFile element){System.out.println("VideoFile:add");}public void remove(AbstractFile element){System.out.println("VideoFile:remove");}public void display(){System.out.println(fileName);System.out.println("VideoFile:display");}}

class TextFile:

import MyElement.AbstractFile;public class TextFile extends AbstractFile{private String fileName;public TextFile(String filename){this.fileName=new String();this.fileName=filename;}public void add(AbstractFile element){System.out.println("TextFile:add");}public void remove(AbstractFile element){System.out.println("TextFile:remove");}public void display(){System.out.println(fileName);System.out.println("TextFile:display");}}

class ImageFile:

</pre><pre class="java" name="code">import MyElement.AbstractFile;public class ImageFile extends AbstractFile{private String fileName;public ImageFile(String filename){this.fileName=new String();this.fileName=filename;}public void add(AbstractFile element){System.out.println("ImageFile:add");}public void remove(AbstractFile element){System.out.println("ImageFile:remove");}public void display(){System.out.println(fileName);System.out.println("ImageFile:display");}}

class Floder:

import java.util.*;import MyElement.AbstractFile;public class Folder extends AbstractFile{private String fileName;private ArrayList fileList=new ArrayList();public Folder(String filename){this.fileName=new String();this.fileName=filename;}public void add(AbstractFile element){fileList.add(element);System.out.println("Folder:add");}public void remove(AbstractFile element){fileList.remove(element);System.out.println("Folder:remove");}public void display(){for(Object object:fileList){((AbstractFile)object).display();}System.out.println("Folder:display");}}

package Client;

class Client:

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

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