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. 类图如下
2. 源代码以及相关截图;
运行截图
源代码
package a10; public abstract class AbstractFile { public abstract void add(AbstractFile element); public abstract void remove(AbstractFile element); public abstract void display(); } package a10; 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 a10; 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 a10; 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 a10; 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"); } } package a10; 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(); }