Tutorial 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；

3.注意编程规范。

package ruanjiansheji.shiyan10;

public abstract class AbstractFile
{
    public abstract void add(AbstractFile element);
    public abstract void remove(AbstractFile element);
    public abstract void display();
}
package ruanjiansheji.shiyan10;

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;
    }

    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 ruanjiansheji.shiyan10;

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");
    }

}
package ruanjiansheji.shiyan10;

public class Main {
    public static void main(String[] args) {
        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();
    }
}
package ruanjiansheji.shiyan10;

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");
    }
}
package ruanjiansheji.shiyan10;

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");
    }
}