Java语言设计模式之组合模式（Composite）

package com.enfo.wd.mode;

import java.util.ArrayList;
import java.util.Iterator;

interface Component{
void operation();
}
class Leaf implements Component{
private String name;
public Leaf(String name){this.name=name;}
public String toString(){return name;}
@Override
public void operation() {
System.out.println(this);
}
}
@SuppressWarnings({ "serial", "rawtypes" })
class Node extends ArrayList implements Component{
private String name;
public Node(String name){this.name=name;}
public String toString(){return name;}
@Override
public void operation() {
System.out.println(this);
for(Iterator it=iterator();it.hasNext();)
((Component)it.next()).operation();
}

}
public class CompositeStructure {
@SuppressWarnings("unchecked")
public void test(){
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();
}
public static void main(String[] args) {
CompositeStructure cp=new CompositeStructure();
cp.test();
}

}