java-design pattern (structural type)-"Combined mode"

1. Combination mode (Composite)

Definition: Combined mode is sometimes called part-the overall mode is convenient when dealing with problems like tree structure

Use scene: Combine multiple objects together to manipulate, often used to represent a tree structure, such as a binary tree, number, etc., file directory.

2. File Replication Examples

File class:

Interface to the various operations of the file public interface fileoperate {void copy ();}    File: Single document class file implements fileoperate{//file name private String filename=null;    Public File (String fileName) {this.filename=filename; } @Overridepublic void Copy () {//TODO auto-generated method StubSystem.out.println ("Copy" "+filename+" "File ...        ");} Public String GetFileName () {return fileName;} public void Setfilename (String fileName) {this.filename = FileName;}}    Folder: Contains all sub-files class Filefolder implements fileoperate{//folder name private String foldername=null;    All sub-Files private arraylist<file> child=new arraylist<file> ();    Public Filefolder (String folderName) {this.foldername=foldername;    }//Add a child file method public void Add (file file) {child.add (file);    } @Overridepublic void Copy () {//TODO auto-generated Method Stub System.out.println ("Current folder:" +foldername);    Iterator It=child.iterator ();  while (It.hasnext ()) {file f= (file) It.next ();    F.copy (); }}        Public String Getfoldername () {return folderName;} public void Setfoldername (String folderName) {this.foldername = FolderName;}}

Test:

public class Test {public static void main (string[] args) {//TODO auto-generated method stub        filefolder root=new File Folder ("My Videos");        File File1=new file ("Fatal Id.avi");        File File2=new file ("Two days a night. rmvb");        Add File        root.add (file1);        Root.add (file2);        Copy file        root.copy ();}}

Operation Result:

Current folder: My video copy "Fatal Id.avi" File ... Copy "Two days a night. rmvb" File ...

　　

java-design pattern (structural type)-"Combined mode"