软件设计实验10：组合模式

实验10：组合模式

本次实验属于模仿型实验，通过本次实验学生将掌握以下内容：

1、理解组合模式的动机，掌握该模式的结构；

2、能够利用组合模式解决实际问题。

 

[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();

}

 

 

public class Client

{

    public static void main(String a[])

    {

        AbstractFile obj1,obj2,obj3,obj4;

        Folder plate1,plate2,plate3;

        obj1=new ImageFile("a.jpg");

        obj2=new TextFile("b.txt");

        plate1=new Folder("Image_Text");

        plate1.add(obj1);

        plate1.add(obj2);

 

        obj3=new VideoFile("c.mp4");

        plate2=new Folder("Image_Video");

        plate2.add(obj1);

        plate2.add(obj3);

 

        obj4=new ImageFile("d.jpg");

        plate3=new Folder("Image_Text_Video_Folder");

        plate3.add(plate1);

        plate3.add(plate2);

        plate3.add(obj4);

 

        plate3.display();

 

    }

}

 

import java.util.*;

 

public class Folder extends AbstractFile

{

    private String fileName;

    private ArrayList<AbstractFile> 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("add Folder");

    }

    public void remove(AbstractFile element)

    {

        fileList.remove(element);

        System.out.println("remove Folder");

    }

    public void display()

    {

        System.out.println(fileName);

        for(Object object:fileList)

        {

            ((AbstractFile)object).display();

        }

        System.out.println("****Folder display****");

    }

}

 

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("add ImageFile");

    }

    public void remove(AbstractFile element)

    {

        System.out.println("remove ImageFile");

    }

    public void display()

    {

        System.out.print(fileName);

        System.out.println(" ImageFile");

    }

}

 

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("add TextFile");

    }

    public void remove(AbstractFile element)

    {

        System.out.println("remove TextFile");

    }

    public void display()

    {

        System.out.print(fileName);

        System.out.println(" TextFile");

    }

}

 

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("add VideoFile");

    }

    public void remove(AbstractFile element)

    {

        System.out.println("remove VideoFile");

    }

    public void display()

    {

        System.out.print(fileName);

        System.out.println(" VideoFile");

    }

}

 

3.注意编程规范。