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：

类图

源代码

1、AbstractFile.java

package org.example.shiyanshi;

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

2、TextFile.java

package org.example.shiyanshi;

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.println(fileName);
        System.out.println(" TextFile");
    }
}

3、VideoFile.java

package org.example.shiyanshi;

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.println(fileName);
        System.out.println(" VideoFile");
    }
}

4、ImageFile.java

package org.example.shiyanshi;

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.println(fileName);
        System.out.println(" ImageFile");
    }
}

5、Folder.java

package org.example.shiyanshi;

import java.util.ArrayList;

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****");
    }
}

6、Client.java

package org.example.shiyanshi;

public class Client {
    public static void main(String[] args) {
        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();
    }
}

运行结果截图