Java 设计模式 之 组合模式

http://www.verejava.com/?id=16999080076266

package com.composite.theory;

import java.util.List;

public class TestNode
{
    public static void main(String[] args)
    {
        Node root=new DefaultNode("世界");
        
        Node china=new DefaultNode("中国");
        Node america=new DefaultNode("美国");
        
        Node beijing=new DefaultNode("北京");
        Node shanghai=new DefaultNode("上海");
        china.add(beijing);
        china.add(shanghai);
        
        Node sanfancisco=new DefaultNode("三藩市");
        Node niuyue=new DefaultNode("纽约");
        america.add(sanfancisco);
        america.add(niuyue);
        
        root.add(china);
        root.add(america);
        
        System.out.println(root.getName());
        List<Node> childeNodes=root.getChildNodes();
        for(Node node :childeNodes)
        {
            System.out.println("----"+node.getName());
            List<Node> childNodes2=node.getChildNodes();
            for(Node node2 :childNodes2)
            {
                System.out.println("--------"+node2.getName());
            }
        }
    }
}





package com.composite.theory;

import java.util.ArrayList;
import java.util.List;

public abstract class Node
{
    protected String name;
    protected List<Node> childNodes;
    public Node(String name)
    {
        super();
        this.name = name;
        this.childNodes=new ArrayList<Node>();
    }
    
    public abstract void add(Node node);
    
    public abstract void remove(int index);
    
    public String getName()
    {
        return name;
    }
    public void setName(String name)
    {
        this.name = name;
    }
    public List<Node> getChildNodes()
    {
        return childNodes;
    }
    
    
    
}





package com.composite.theory;

public class DefaultNode extends Node
{

    public DefaultNode(String name)
    {
        super(name);
    }

    @Override
    public void add(Node node)
    {
        childNodes.add(node);
    }

    @Override
    public void remove(int index)
    {
        childNodes.remove(index);
    }

}

http://www.verejava.com/?id=16999080076266