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Compositeģʽ(×éºÏ)
   JavaÉîÈëµ½Ò»¶¨³Ì¶È,¾Í²»¿É±ÜÃâµÄÅöµ½Éè¼ÆģʽÕâÒ»¸ÅÄî,Á˽âÉè¼Æģʽ,½«Ê¹×Ô¼º¶ÔjavaÖеĽӿڻò³éÏóÀàÓ¦ÓÃÓиüÉîµÄÀí½â.Éè¼ÆģʽÔÚjavaµÄÖÐÐÍϵͳÖÐÓ¦Óù㷺,×ñÑ­Ò»¶¨µÄ±à³Ìģʽ,²ÅÄÜʹ×Ô¼ºµÄ´úÂë±ãÓÚÀí½â,Ò×ÓÚ½»Á÷,Composite(×éºÏģʽ)ģʽÊDZȽϳ£ÓõÄÒ»¸öģʽ.
   Composite×éºÏģʽ£¬½«¶ÔÏóÒÔÊ÷Ðνṹ×éÖ¯ÆðÀ´,ÒÔ´ï³É“²¿·Ö£­ÕûÌå” µÄ²ã´Î½á¹¹£¬Ê¹µÃ¿Í»§¶Ë¶Ôµ¥¸ö¶ÔÏóºÍ×éºÏ¶ÔÏóµÄʹÓþßÓÐÒ»ÖÂÐÔ¡£
   Óŵã: 1.ʹ¿Í»§¶Ëµ÷Óüòµ¥£¬¿Í»§¶Ë¿ÉÒÔÒ»ÖµÄʹÓÃ×éºÏ½á¹¹»òÆäÖе¥¸ö¶ÔÏó£¬Óû§¾Í²»±Ø¹Øϵ×Ô¼º´¦ÀíµÄÊǵ¥¸ö¶ÔÏó»¹ÊÇÕû¸ö×éºÏ½á¹¹£¬Õâ¾Í¼ò»¯ÁË¿Í»§¶Ë´úÂë¡£
         2.¸üÈÝÒ×ÔÚ×éºÏÌåÄÚ¼ÓÈë¶ÔÏ󲿼þ. ¿Í»§¶Ë²»±ØÒòΪ¼ÓÈëÁËеĶÔÏ󲿼þ¶ø¸ü¸Ä´úÂë¡£
  ÔÚ´ËдÁË6¸öjavaÀàÀ´ÃèÊö˵Ã÷CompositeÉè¼ÆģʽµÄʵÏÖ·½Ê½£»
  1¡¢ Circle.java      ²¿¼þ-Ô²
  2¡¢ Graph.java       ²¿¼þ-³éÏóÀà
  3¡¢ Line.java        ²¿¼þ-Ïß
  4¡¢ Picture.java     ²¿¼þ-ͼ
  5¡¢ Rectangle.java   ²¿¼þ-·½
  6¡¢ PictureTest.java ´øÓÐmain·½·¨µÄ²âÊÔÀà
===============   1¡¢ Circle.java
package composite;
//²¿¼þ-Ô²
public class Circle extends Graph {
 public void draw() {
  System.out.println("Draw a circle.");
 }
}
===============   1 end
===============   2¡¢ Graph.java
package composite;
import java.util.Iterator;
//²¿¼þ-³éÏóÀà
public abstract class Graph{
 //»­Í¼
    public abstract void draw();
 //Ôö¼ÓÒ»¸öͼÐÎ
 public void add(Graph g){};
 //ɾ³ýÒ»¸öͼÐÎ×é¼þ
 public void remove(Graph g){};
 
 //»ñµÃ×éºÏÌåµÄÄÚ²¿²¿¼þ
 public Iterator<Graph> iter(){return null;};
}
===============   2 end
===============   3¡¢ Line.java
package composite;
//²¿¼þ-Ïß
public class Line extends Graph {
 public void draw() {
  System.out.p


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