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；

3.注意编程规范。

1、类图

 

源代码

package org.example;

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

package org.example;

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();
    }
}

package org.example;

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****");
    }
}

package org.example;

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");
    }
}

package org.example;

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");
    }
}

package org.example;

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、运行截图