{"id":98,"date":"2008-03-04T15:42:09","date_gmt":"2008-03-04T15:42:09","guid":{"rendered":""},"modified":"2008-03-04T15:42:09","modified_gmt":"2008-03-04T15:42:09","slug":"98","status":"publish","type":"post","link":"https:\/\/www.poloo.org\/?p=98","title":{"rendered":"\u5408\u6210\u6a21\u5f0f(Composite Pattern)"},"content":{"rendered":"

\u4e00\u3001 \u5408\u6210\uff08Composite\uff09\u6a21\u5f0f
\u5408\u6210\u6a21\u5f0f\u6709\u65f6\u53c8\u53eb\u505a\u90e8\u5206\uff0d\u6574\u4f53\u6a21\u5f0f\uff08Part-Whole\uff09\u3002\u5408\u6210\u6a21\u5f0f\u5c06\u5bf9\u8c61\u7ec4\u7ec7\u5230\u6811\u7ed3\u6784\u4e2d\uff0c\u53ef\u4ee5\u7528\u6765\u63cf\u8ff0\u6574\u4f53\u4e0e\u90e8\u5206\u7684\u5173\u7cfb\u3002\u5408\u6210\u6a21\u5f0f\u53ef\u4ee5\u4f7f\u5ba2\u6237\u7aef\u5c06\u5355\u7eaf\u5143\u7d20\u4e0e\u590d\u5408\u5143\u7d20\u540c\u7b49\u770b\u5f85\u3002<\/p>\n

\u4ece\u548c\u5c1a\u7684\u6545\u4e8b\u8c08\u8d77<\/p>\n

\u8fd9\u662f\u5c0f\u65f6\u5019\u6211\u5976\u5976\u8bb2\u7684\u6545\u4e8b\uff1a\u4ece\u524d\u6709\u4e2a\u5c71\uff0c\u5c71\u91cc\u6709\u4e2a\u5e99\uff0c\u5e99\u91cc\u6709\u4e2a\u8001\u548c\u5c1a\u5728\u7ed9\u5c0f\u548c\u5c1a\u8bb2\u6545\u4e8b\uff0c\u8bb2\u7684\u4ec0\u4e48\u6545\u4e8b\u5462\uff1f\u4ece\u524d\u6709\u4e2a\u5c71\uff0c\u5c71\u91cc\u6709\u4e2a\u5e99\u2026\u2026\u3002\u5976\u5976\u7684\u6545\u4e8b\u8981\u5faa\u73af\u591a\u5c11\u6b21\uff0c\u6839\u636e\u4f60\u591a\u957f\u65f6\u95f4\u7761\u7740\u800c\u5b9a\u3002\u5728\u6545\u4e8b\u4e2d\u6709\u5c71\u3001\u6709\u5e99\u3001\u6709\u548c\u5c1a\u3001\u6709\u6545\u4e8b\u3002\u56e0\u6b64\uff0c\u6545\u4e8b\u7684\u89d2\u8272\u6709\u4e24\u79cd\uff1a\u4e00\u79cd\u91cc\u9762\u6ca1\u6709\u5176\u5b83\u89d2\u8272\uff1b\u53e6\u4e00\u79cd\u5185\u90e8\u6709\u5176\u5b83\u89d2\u8272\u3002<\/p>\n

\u5bf9\u8c61\u7684\u6811\u7ed3\u6784<\/p>\n

\u4e00\u4e2a\u6811\u7ed3\u6784\u7531\u4e24\u79cd\u8282\u70b9\u7ec4\u6210\uff1a\u6811\u679d\u8282\u70b9\u548c\u6811\u53f6\u8282\u70b9\u3002\u6811\u679d\u8282\u70b9\u53ef\u4ee5\u6709\u5b50\u8282\u70b9\uff0c\u800c\u4e00\u4e2a\u6811\u53f6\u8282\u70b9\u4e0d\u53ef\u4ee5\u6709\u5b50\u8282\u70b9\u3002\u9664\u4e86\u6839\u8282\u70b9\u5916\uff0c\u5176\u5b83\u8282\u70b9\u6709\u4e14\u53ea\u6709\u4e00\u4e2a\u7236\u8282\u70b9\u3002<\/p>\n

\u6ce8\u610f\uff1a\u4e00\u4e2a\u6811\u679d\u8282\u70b9\u53ef\u4ee5\u4e0d\u5e26\u4efb\u4f55\u53f6\u5b50\uff0c\u4f46\u662f\u5b83\u56e0\u4e3a\u6709\u5e26\u53f6\u5b50\u7684\u80fd\u529b\uff0c\u56e0\u6b64\u4ecd\u7136\u662f\u6811\u679d\u8282\u70b9\uff0c\u800c\u4e0d\u4f1a\u6210\u4e3a\u53f6\u8282\u70b9\u3002\u4e00\u4e2a\u6811\u53f6\u8282\u70b9\u6c38\u8fdc\u4e0d\u53ef\u80fd\u5e26\u6709\u5b50\u8282\u70b9\u3002<\/p>\n

\u4e8c\u3001 \u5408\u6210\u6a21\u5f0f\u6982\u8ff0
\u4e0b\u56fe\u6240\u793a\u7684\u7c7b\u56fe\u7701\u7565\u4e86\u5404\u4e2a\u89d2\u8272\u7684\u7ec6\u8282\u3002<\/p>\n


\u53ef\u4ee5\u770b\u51fa\uff0c\u4e0a\u9762\u7684\u7c7b\u56fe\u7ed3\u6784\u6d89\u53ca\u5230\u4e09\u4e2a\u89d2\u8272\uff1a<\/p>\n

\u62bd\u8c61\u6784\u4ef6\uff08Component\uff09\u89d2\u8272\uff1a\u8fd9\u662f\u4e00\u4e2a\u62bd\u8c61\u89d2\u8272\uff0c\u5b83\u7ed9\u53c2\u4e0e\u7ec4\u5408\u7684\u5bf9\u8c61\u89c4\u5b9a\u4e00\u4e2a\u63a5\u53e3\u3002\u8fd9\u4e2a\u89d2\u8272\u7ed9\u51fa\u5171\u6709\u63a5\u53e3\u53ca\u5176\u9ed8\u8ba4\u884c\u4e3a\u3002
\u6811\u53f6\u6784\u4ef6\uff08Leaf\uff09\u89d2\u8272\uff1a\u4ee3\u8868\u53c2\u52a0\u7ec4\u5408\u7684\u6811\u53f6\u5bf9\u8c61\u3002\u4e00\u4e2a\u6811\u53f6\u5bf9\u8c61\u6ca1\u6709\u4e0b\u7ea7\u5b50\u5bf9\u8c61\u3002
\u6811\u679d\u6784\u4ef6\uff08Composite\uff09\u89d2\u8272\uff1a\u4ee3\u8868\u53c2\u52a0\u7ec4\u5408\u7684\u6709\u5b50\u5bf9\u8c61\u7684\u5bf9\u8c61\uff0c\u5e76\u7ed9\u51fa\u6811\u679d\u6784\u4ef6\u5bf9\u8c61\u7684\u884c\u4e3a\u3002
\u53ef\u4ee5\u770b\u51fa\uff0cComposite\u7c7b\u578b\u7684\u5bf9\u8c61\u53ef\u4ee5\u5305\u542b\u5176\u5b83Component\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\u6362\u800c\u8a00\u4e4b\uff0cComposite\u7c7b\u578b\u5bf9\u8c61\u53ef\u4ee5\u542b\u6709\u5176\u5b83\u7684\u6811\u679d\uff08Composite\uff09\u7c7b\u578b\u6216\u6811\u53f6\uff08Leaf\uff09\u7c7b\u578b\u7684\u5bf9\u8c61\u3002<\/p>\n

\u5408\u6210\u6a21\u5f0f\u7684\u5b9e\u73b0\u6839\u636e\u6240\u5b9e\u73b0\u63a5\u53e3\u7684\u533a\u522b\u5206\u4e3a\u4e24\u79cd\u5f62\u5f0f\uff0c\u5206\u522b\u79f0\u4e3a\u5b89\u5168\u6a21\u5f0f\u548c\u900f\u660e\u6a21\u5f0f\u3002\u5408\u6210\u6a21\u5f0f\u53ef\u4ee5\u4e0d\u63d0\u4f9b\u7236\u5bf9\u8c61\u7684\u7ba1\u7406\u65b9\u6cd5\uff0c\u4f46\u5408\u6210\u6a21\u5f0f\u5fc5\u987b\u5728\u5408\u9002\u7684\u5730\u65b9\u63d0\u4f9b\u5b50\u5bf9\u8c61\u7684\u7ba1\u7406\u65b9\u6cd5\uff08\u8bf8\u5982\uff1aadd\u3001remove\u3001getChild\u7b49\uff09\u3002<\/p>\n

\u900f\u660e\u65b9\u5f0f<\/p>\n

\u4f5c\u4e3a\u7b2c\u4e00\u79cd\u9009\u62e9\uff0c\u5728Component\u91cc\u9762\u58f0\u660e\u6240\u6709\u7684\u7528\u6765\u7ba1\u7406\u5b50\u7c7b\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u5305\u62ecadd\uff08\uff09\u3001remove\uff08\uff09\uff0c\u4ee5\u53cagetChild\uff08\uff09\u65b9\u6cd5\u3002\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\u6240\u6709\u7684\u6784\u4ef6\u7c7b\u90fd\u6709\u76f8\u540c\u7684\u63a5\u53e3\u3002\u5728\u5ba2\u6237\u7aef\u770b\u6765\uff0c\u6811\u53f6\u7c7b\u5bf9\u8c61\u4e0e\u5408\u6210\u7c7b\u5bf9\u8c61\u7684\u533a\u522b\u8d77\u7801\u5728\u63a5\u53e3\u5c42\u6b21\u4e0a\u6d88\u5931\u4e86\uff0c\u5ba2\u6237\u7aef\u53ef\u4ee5\u540c\u7b49\u540c\u7684\u5bf9\u5f85\u6240\u6709\u7684\u5bf9\u8c61\u3002\u8fd9\u5c31\u662f\u900f\u660e\u5f62\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u3002<\/p>\n

\u8fd9\u4e2a\u9009\u62e9\u7684\u7f3a\u70b9\u662f\u4e0d\u591f\u5b89\u5168\uff0c\u56e0\u4e3a\u6811\u53f6\u7c7b\u5bf9\u8c61\u548c\u5408\u6210\u7c7b\u5bf9\u8c61\u5728\u672c\u8d28\u4e0a\u662f\u6709\u533a\u522b\u7684\u3002\u6811\u53f6\u7c7b\u5bf9\u8c61\u4e0d\u53ef\u80fd\u6709\u4e0b\u4e00\u4e2a\u5c42\u6b21\u7684\u5bf9\u8c61\uff0c\u56e0\u6b64add\uff08\uff09\u3001remove\uff08\uff09\u4ee5\u53cagetChild\uff08\uff09\u65b9\u6cd5\u6ca1\u6709\u610f\u4e49\uff0c\u662f\u5728\u7f16\u8bd1\u65f6\u671f\u4e0d\u4f1a\u51fa\u9519\uff0c\u800c\u53ea\u4f1a\u5728\u8fd0\u884c\u65f6\u671f\u624d\u4f1a\u51fa\u9519\u3002<\/p>\n

\u5b89\u5168\u65b9\u5f0f<\/p>\n

\u7b2c\u4e8c\u79cd\u9009\u62e9\u662f\u5728Composite\u7c7b\u91cc\u9762\u58f0\u660e\u6240\u6709\u7684\u7528\u6765\u7ba1\u7406\u5b50\u7c7b\u5bf9\u8c61\u7684\u65b9\u6cd5\u3002\u8fd9\u6837\u7684\u505a\u6cd5\u662f\u5b89\u5168\u7684\u505a\u6cd5\uff0c\u56e0\u4e3a\u6811\u53f6\u7c7b\u578b\u7684\u5bf9\u8c61\u6839\u672c\u5c31\u6ca1\u6709\u7ba1\u7406\u5b50\u7c7b\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u56e0\u6b64\uff0c\u5982\u679c\u5ba2\u6237\u7aef\u5bf9\u6811\u53f6\u7c7b\u5bf9\u8c61\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u65f6\uff0c\u7a0b\u5e8f\u4f1a\u5728\u7f16\u8bd1\u65f6\u671f\u51fa\u9519\u3002<\/p>\n

\u8fd9\u4e2a\u9009\u62e9\u7684\u7f3a\u70b9\u662f\u4e0d\u591f\u900f\u660e\uff0c\u56e0\u4e3a\u6811\u53f6\u7c7b\u548c\u5408\u6210\u7c7b\u5c06\u5177\u6709\u4e0d\u540c\u7684\u63a5\u53e3\u3002<\/p>\n

\u8fd9\u4e24\u4e2a\u5f62\u5f0f\u5404\u6709\u4f18\u7f3a\u70b9\uff0c\u9700\u8981\u6839\u636e\u8f6f\u4ef6\u7684\u5177\u4f53\u60c5\u51b5\u505a\u51fa\u53d6\u820d\u51b3\u5b9a\u3002<\/p>\n

\u4e09\u3001 \u5b89\u5168\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u7684\u7ed3\u6784
\u5b89\u5168\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u8981\u6c42\u7ba1\u7406\u805a\u96c6\u7684\u65b9\u6cd5\u53ea\u51fa\u73b0\u5728\u6811\u679d\u6784\u4ef6\u7c7b\u4e2d\uff0c\u800c\u4e0d\u51fa\u73b0\u5728\u6811\u53f6\u6784\u4ef6\u4e2d\u3002

\u8fd9\u79cd\u5f62\u5f0f\u6d89\u53ca\u5230\u4e09\u4e2a\u89d2\u8272\uff1a<\/p>\n

\u62bd\u8c61\u6784\u4ef6(Component)\u89d2\u8272\uff1a\u8fd9\u662f\u4e00\u4e2a\u62bd\u8c61\u89d2\u8272\uff0c\u5b83\u7ed9\u53c2\u52a0\u7ec4\u5408\u7684\u5bf9\u8c61\u5b9a\u4e49\u51fa\u516c\u5171\u7684\u63a5\u53e3\u53ca\u5176\u9ed8\u8ba4\u884c\u4e3a\uff0c\u53ef\u4ee5\u7528\u6765\u7ba1\u7406\u6240\u6709\u7684\u5b50\u5bf9\u8c61\u3002\u5728\u5b89\u5168\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u91cc\uff0c\u6784\u4ef6\u89d2\u8272\u5e76\u4e0d\u662f\u5b9a\u4e49\u51fa\u7ba1\u7406\u5b50\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u8fd9\u4e00\u5b9a\u4e49\u7531\u6811\u679d\u6784\u4ef6\u5bf9\u8c61\u7ed9\u51fa\u3002
\u6811\u53f6\u6784\u4ef6\uff08Leaf\uff09\u89d2\u8272\uff1a\u6811\u53f6\u5bf9\u8c61\u662f\u6ca1\u6709\u4e0b\u7ea7\u5b50\u5bf9\u8c61\u7684\u5bf9\u8c61\uff0c\u5b9a\u4e49\u51fa\u53c2\u52a0\u7ec4\u5408\u7684\u539f\u59cb\u5bf9\u8c61\u7684\u884c\u4e3a\u3002
\u6811\u679d\u6784\u4ef6\uff08Composite\uff09\u89d2\u8272\uff1a\u4ee3\u8868\u53c2\u52a0\u7ec4\u5408\u7684\u6709\u4e0b\u7ea7\u5b50\u5bf9\u8c61\u7684\u5bf9\u8c61\u3002\u6811\u679d\u5bf9\u8c61\u7ed9\u51fa\u6240\u6709\u7684\u7ba1\u7406\u5b50\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u5982add\uff08\uff09\u3001remove\uff08\uff09\u3001getChild\uff08\uff09\u7b49\u3002 <\/p>\n

\u56db\u3001 \u5b89\u5168\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u5b9e\u73b0
\u4ee5\u4e0b\u793a\u4f8b\u6027\u4ee3\u7801\u6f14\u793a\u4e86\u5b89\u5168\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u4ee3\u7801\uff1a
\/\/ Composite pattern -- Structural example  
using System;
using System.Text;
using System.Collections;<\/p>\n

\/\/ \"Component\"
abstract class Component
{
  \/\/ Fields
  protected string name;<\/p>\n

  \/\/ Constructors
  public Component( string name )
  {
    this.name = name;
  }<\/p>\n

  \/\/ Operation
  public abstract void Display( int depth );
}<\/p>\n

\/\/ \"Composite\"
class Composite : Component
{
  \/\/ Fields
  private ArrayList children = new ArrayList();<\/p>\n

  \/\/ Constructors
  public Composite( string name ) : base( name ) {}<\/p>\n

  \/\/ Methods
  public void Add( Component component )
  {
    children.Add( component );
  }
  public void Remove( Component component )
  {
    children.Remove( component );
  }
  public override void Display( int depth )
  {
    Console.WriteLine( new String( '-', depth ) + name );<\/p>\n

    \/\/ Display each of the node's children
    foreach( Component component in children )
      component.Display( depth + 2 );
  }
}<\/p>\n

\/\/ \"Leaf\"
class Leaf : Component
{
  \/\/ Constructors
  public Leaf( string name ) : base( name ) {}<\/p>\n

  \/\/ Methods
  public override void Display( int depth )
  {
    Console.WriteLine( new String( '-', depth ) + name );
  }
}<\/p>\n

\/**\/\/\/\/ <summary>
\/\/\/ Client test
\/\/\/ <\/summary>
public class Client
{
  public static void Main( string[] args )
  {
    \/\/ Create a tree structure
    Composite root = new Composite( \"root\" );
    root.Add( new Leaf( \"Leaf A\" ));
    root.Add( new Leaf( \"Leaf B\" ));
    Composite comp = new Composite( \"Composite X\" );<\/p>\n

    comp.Add( new Leaf( \"Leaf XA\" ) );
    comp.Add( new Leaf( \"Leaf XB\" ) );
    root.Add( comp );<\/p>\n

    root.Add( new Leaf( \"Leaf C\" ));<\/p>\n

    \/\/ Add and remove a leaf
    Leaf l = new Leaf( \"Leaf D\" );
    root.Add( l );
    root.Remove( l );<\/p>\n

    \/\/ Recursively display nodes
    root.Display( 1 );
  }
}
<\/code> <\/p>\n

\u4e94\u3001 \u900f\u660e\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u7ed3\u6784
\u4e0e\u5b89\u5168\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u4e0d\u540c\u7684\u662f\uff0c\u900f\u660e\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u8981\u6c42\u6240\u6709\u7684\u5177\u4f53\u6784\u4ef6\u7c7b\uff0c\u4e0d\u8bba\u6811\u679d\u6784\u4ef6\u8fd8\u662f\u6811\u53f6\u6784\u4ef6\uff0c\u5747\u7b26\u5408\u4e00\u4e2a\u56fa\u5b9a\u7684\u63a5\u53e3\u3002

\u8fd9\u79cd\u5f62\u5f0f\u6d89\u53ca\u5230\u4e09\u4e2a\u89d2\u8272\uff1a<\/p>\n

\u62bd\u8c61\u6784\u4ef6\uff08Component\uff09\u89d2\u8272\uff1a\u8fd9\u662f\u4e00\u4e2a\u62bd\u8c61\u89d2\u8272\uff0c\u5b83\u7ed9\u53c2\u52a0\u7ec4\u5408\u7684\u5bf9\u8c61\u89c4\u5b9a\u4e00\u4e2a\u63a5\u53e3\uff0c\u89c4\u8303\u5171\u6709\u7684\u63a5\u53e3\u53ca\u9ed8\u8ba4\u884c\u4e3a\u3002
\u6811\u53f6\u6784\u4ef6\uff08Leaf\uff09\u89d2\u8272\uff1a\u4ee3\u8868\u53c2\u52a0\u7ec4\u5408\u7684\u6811\u53f6\u5bf9\u8c61\uff0c\u5b9a\u4e49\u51fa\u53c2\u52a0\u7ec4\u5408\u7684\u539f\u59cb\u5bf9\u8c61\u7684\u884c\u4e3a\u3002\u6811\u53f6\u7c7b\u4f1a\u7ed9\u51faadd\uff08\uff09\u3001remove\uff08\uff09\u4ee5\u53cagetChild\uff08\uff09\u4e4b\u7c7b\u7684\u7528\u6765\u7ba1\u7406\u5b50\u7c7b\u5bf9\u5bf9\u8c61\u7684\u65b9\u6cd5\u7684\u5e73\u5eb8\u5b9e\u73b0\u3002
\u6811\u679d\u6784\u4ef6\uff08Composite\uff09\u89d2\u8272\uff1a\u4ee3\u8868\u53c2\u52a0\u7ec4\u5408\u7684\u6709\u5b50\u5bf9\u8c61\u7684\u5bf9\u8c61\uff0c\u5b9a\u4e49\u51fa\u8fd9\u6837\u7684\u5bf9\u8c61\u7684\u884c\u4e3a\u3002 <\/p>\n

\u516d\u3001 \u900f\u660e\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u5b9e\u73b0
\u4ee5\u4e0b\u793a\u4f8b\u6027\u4ee3\u7801\u6f14\u793a\u4e86\u5b89\u5168\u5f0f\u7684\u5408\u6210\u6a21\u5f0f\u4ee3\u7801\uff1a
\/\/ Composite pattern -- Structural example  <\/p>\n

using System;
using System.Text;
using System.Collections;<\/p>\n

\/\/ \"Component\"
abstract class Component
{
  \/\/ Fields
  protected string name;<\/p>\n

  \/\/ Constructors
  public Component( string name )
  { this.name = name; }<\/p>\n

  \/\/ Methods
  abstract public void Add(Component c);
  abstract public void Remove( Component c );
  abstract public void Display( int depth );
}<\/p>\n

\/\/ \"Composite\"
class Composite : Component
{
  \/\/ Fields
  private ArrayList children = new ArrayList();<\/p>\n

  \/\/ Constructors
  public Composite( string name ) : base( name ) {}<\/p>\n

  \/\/ Methods
  public override void Add( Component component )
  { children.Add( component ); }
  
  public override void Remove( Component component )
  { children.Remove( component ); }
  
  public override void Display( int depth )
  {
    Console.WriteLine( new String( '-', depth ) + name );<\/p>\n

    \/\/ Display each of the node's children
    foreach( Component component in children )
      component.Display( depth + 2 );
  }
}<\/p>\n

\/\/ \"Leaf\"
class Leaf : Component
{
  \/\/ Constructors
  public Leaf( string name ) : base( name ) {}<\/p>\n

  \/\/ Methods
  public override void Add( Component c )
  { Console.WriteLine(\"Cannot add to a leaf\"); }<\/p>\n

  public override void Remove( Component c )
  { Console.WriteLine(\"Cannot remove from a leaf\"); }<\/p>\n

  public override void Display( int depth )
  { Console.WriteLine( new String( '-', depth ) + name ); }
}<\/p>\n

\/**\/\/\/\/ <summary>
\/\/\/ Client test
\/\/\/ <\/summary>
public class Client
{
  public static void Main( string[] args )
  {
    \/\/ Create a tree structure
    Composite root = new Composite( \"root\" );
    root.Add( new Leaf( \"Leaf A\" ));
    root.Add( new Leaf( \"Leaf B\" ));
    Composite comp = new Composite( \"Composite X\" );<\/p>\n

    comp.Add( new Leaf( \"Leaf XA\" ) );
    comp.Add( new Leaf( \"Leaf XB\" ) );
    root.Add( comp );<\/p>\n

    root.Add( new Leaf( \"Leaf C\" ));<\/p>\n

    \/\/ Add and remove a leaf
    Leaf l = new Leaf( \"Leaf D\" );
    root.Add( l );
    root.Remove( l );<\/p>\n

    \/\/ Recursively display nodes
    root.Display( 1 );
  }
}
<\/code><\/p>\n

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\u6709\u65f6\u5019\u7cfb\u7edf\u9700\u8981\u904d\u5386\u4e00\u4e2a\u6811\u679d\u7ed3\u6784\u7684\u5b50\u6784\u4ef6\u5f88\u591a\u6b21\uff0c\u8fd9\u65f6\u5019\u53ef\u4ee5\u8003\u8651\u628a\u904d\u5386\u5b50\u6784\u4ef6\u7684\u7ed3\u679c\u6682\u65f6\u5b58\u50a8\u5728\u7236\u6784\u4ef6\u91cc\u9762\u4f5c\u4e3a\u7f13\u5b58\u3002
\u5173\u4e8e\u4f7f\u7528\u4ec0\u4e48\u6570\u636e\u7c7b\u578b\u6765\u5b58\u50a8\u5b50\u5bf9\u8c61\u7684\u95ee\u9898\uff0c\u5728\u793a\u610f\u6027\u7684\u4ee3\u7801\u4e2d\u4f7f\u7528\u4e86ArrayList\uff0c\u5728\u5b9e\u9645\u7cfb\u7edf\u4e2d\u53ef\u4ee5\u4f7f\u7528\u5176\u5b83\u805a\u96c6\u6216\u6570\u7ec4\u7b49\u3002
\u5ba2\u6237\u7aef\u5c3d\u91cf\u4e0d\u8981\u76f4\u63a5\u8c03\u7528\u6811\u53f6\u7c7b\u4e2d\u7684\u65b9\u6cd5\uff0c\u800c\u662f\u501f\u52a9\u5176\u7236\u7c7b\uff08Component\uff09\u7684\u591a\u6001\u6027\u5b8c\u6210\u8c03\u7528\uff0c\u8fd9\u6837\u53ef\u4ee5\u589e\u52a0\u4ee3\u7801\u7684\u590d\u7528\u6027\u3002 <\/p>\n

\u516b\u3001 \u548c\u5c1a\u7684\u6545\u4e8b


\u4e5d\u3001 \u4e00\u4e2a\u5b9e\u9645\u5e94\u7528Composite\u6a21\u5f0f\u7684\u4f8b\u5b50
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\/\/ Composite pattern -- Real World example  <\/p>\n

using System;
using System.Collections;<\/p>\n

\/\/ \"Component\"
abstract class DrawingElement
{
  \/\/ Fields
  protected string name;<\/p>\n

  \/\/ Constructors
  public DrawingElement( string name )
  { this.name = name; }<\/p>\n

  \/\/ Operation
  abstract public void Display( int indent );
}<\/p>\n

\/\/ \"Leaf\"
class PrimitiveElement : DrawingElement
{
  \/\/ Constructors
  public PrimitiveElement( string name ) : base( name ) {}<\/p>\n

  \/\/ Operation
  public override void Display( int indent )
  {
    Console.WriteLine( new String( '-', indent ) +
      \" draw a {0}\", name );
  }
}<\/p>\n

\/\/ \"Composite\"
class CompositeElement : DrawingElement
{
  \/\/ Fields
  private ArrayList elements = new ArrayList();<\/p>\n

  \/\/ Constructors
  public CompositeElement( string name ) : base( name ) {}<\/p>\n

  \/\/ Methods
  public void Add( DrawingElement d )
  { elements.Add( d ); }<\/p>\n

  public void Remove( DrawingElement d )
  { elements.Remove( d ); }<\/p>\n

  public override void Display( int indent )
  {
    Console.WriteLine( new String( '-', indent ) +
      \"+ \" + name );<\/p>\n

    \/\/ Display each child element on this node
    foreach( DrawingElement c in elements )
      c.Display( indent + 2 );
  }
}<\/p>\n

\/**\/\/\/\/ <summary>
\/\/\/  CompositeApp test
\/\/\/ <\/summary>
public class CompositeApp
{
  public static void Main( string[] args )
  {
    \/\/ Create a tree structure
    CompositeElement root = new  
      CompositeElement( \"Picture\" );
    root.Add( new PrimitiveElement( \"Red Line\" ));
    root.Add( new PrimitiveElement( \"Blue Circle\" ));
    root.Add( new PrimitiveElement( \"Green Box\" ));<\/p>\n

    CompositeElement comp = new  
      CompositeElement( \"Two Circles\" );
    comp.Add( new PrimitiveElement( \"Black Circle\" ) );
    comp.Add( new PrimitiveElement( \"White Circle\" ) );
    root.Add( comp );<\/p>\n

    \/\/ Add and remove a PrimitiveElement
    PrimitiveElement l = new PrimitiveElement( \"Yellow Line\" );
    root.Add( l );
    root.Remove( l );<\/p>\n

    \/\/ Recursively display nodes
    root.Display( 1 );
  }
}
<\/code> <\/p>\n

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