算法题！请问如何将一段json转成这样的树？

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

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

/**
 * Created by Rayn on 2014/9/18.
 */
public class JSONParseDemo
{
    public static void main(String[] args)
    {
        List<Nodes> listNodes = JSONObject.parseArray("[{id: 1, name: \"上海XX网络公司\", parentid: 0 },{ id: 2, name: \"总裁办\", parentid: 1 },{ id: 3, name: \"产品部\", parentid: 2},{id: 4,name: \"设计部\",parentid: 1}]", Nodes.class);

        List<TreeNodes> treeNodeses = new ArrayList<TreeNodes>();
        for(int j = 0, len = listNodes.size(); j < len; j++)
        {
            Nodes childrenNode = listNodes.get(j);
            if(childrenNode.getParentid() == 0)
            {
                TreeNodes chi = new TreeNodes();
                chi.setLabel(childrenNode.getName());
                chi.setValue(childrenNode.getId() + "");
                chi.setChildren(getChildrenNode(treeNodeses, listNodes, childrenNode.getId()));
                treeNodeses.add(chi);
            }
        }

        System.out.println(JSON.toJSON(treeNodeses));
    }




    public static List<TreeNodes> getChildrenNode(List<TreeNodes> treeNodeses, List<Nodes> listNodes, int id)
    {
        List<TreeNodes> temp = new ArrayList<TreeNodes>();
        for(int j = 0, len = listNodes.size(); j < len; j++)
        {
            TreeNodes chi = new TreeNodes();
            Nodes childrenNode = listNodes.get(j);
            if (childrenNode.getParentid() == id)
            {
                chi.setLabel(childrenNode.getName());
                chi.setValue(childrenNode.getId() + "");
                chi.setChildren(getChildrenNode(treeNodeses, listNodes, childrenNode.getId()));
                temp.add(chi);
            }
        }
        return temp;
    }
}

class TreeNodes
{
    private String label;

    private String value;

    private List<TreeNodes> children;

    public String getLabel()
    {
        return label;
    }

    public void setLabel(String label)
    {
        this.label = label;
    }

    public String getValue()
    {
        return value;
    }

    public void setValue(String value)
    {
        this.value = value;
    }

    public List<TreeNodes> getChildren()
    {
        return children;
    }

    public void setChildren(List<TreeNodes> children)
    {
        this.children = children;
    }
}

class Nodes
{
    private String name;

    private int id;

    private int parentid;

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public int getId()
    {
        return id;
    }

    public void setId(int id)
    {
        this.id = id;
    }

    public int getParentid()
    {
        return parentid;
    }

    public void setParentid(int parentid)
    {
        this.parentid = parentid;
    }

	}



	





	





	





	我试了试，，，，凑合着可以用，，你看看是否满足你的要求！！！