/*********************************************************************** <pre>* FILE : Demo01.java* CLASS : Demo01** AUTHOR : Liaokailin** FUNCTION : TODO***======================================================================* CHANGE HISTORY LOG*----------------------------------------------------------------------* MOD. NO.|   DATE   |   NAME  | REASON  | CHANGE REQ.*----------------------------------------------------------------------*             |2014-3-5|Liaokailin| Created |* DESCRIPTION:* </pre>***********************************************************************/
package org.demo.composite;import java.util.ArrayList;
import java.util.Iterator;/*** 存在整体和部分的时候  希望客户端忽略整体和部分的区别* Function : * @author : Liaokailin* CreateDate : 2014-3-5* version : 1.0*/
public class Demo01 {@SuppressWarnings("unchecked")public static void main(String args[]){Node root = new Node("root") ;root.add(new Leaf("-leaf1")) ;Node c2 = new Node("-Node1") ;c2.add(new Leaf("--leaf2")) ;c2.add(new Leaf("--leaf3")) ;root.add(c2) ;c2 = new Node("-Node2");c2.add(new Leaf("--Leaf4"));c2.add(new Leaf("--Leaf5"));root.add(c2);root.operation() ;}
}interface Component{void operation() ;
}class Leaf implements Component{private String name  ;public Leaf(String name ){this.name = name ;}public String toString(){ return this.name ;}@Overridepublic void operation() {System.out.println(this) ;}
}class Node extends ArrayList implements Component{private String name ;public Node(String name){this.name = name ;}public String toString(){return this.name ;}@Overridepublic void operation() {System.out.println(this) ;for(Iterator it = iterator() ;it.hasNext();){  // iterator() :获取集合中的元素
            ((Component)(it.next())).operation() ;}}}

root
-leaf1
-Node1
--leaf2
--leaf3
-Node2
--Leaf4
--Leaf5