组合模式

[实验任务一]：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。

实验要求：

1. 文件的执行不需真正实现，只需简单提示即可；

 

2. 提交源代码；

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();

 

}

}