map遍历问题

 public static void main(String[] args)
    {
        Map<String, Object> map = new HashMap<String, Object>();

        Map<String, Object> nextMap = new HashMap<String, Object>();

        Map<String, Object> nextMap1 = new HashMap<String, Object>();

        map.put("components", nextMap);

        nextMap.put("component_1", nextMap1);

        nextMap1.put("backurl_1", "xxxxxxxxxxx");
        nextMap1.put("backdate_1", "010-10-21");
        nextMap1.put("backname_1", "back1");

        nextMap1 = new HashMap<String, Object>();
        nextMap.put("component_2", nextMap1);

        nextMap1.put("backdate_2", "2010-10-21");
        nextMap1.put("backurl_2", "xxxxxxxxxxx");
        nextMap1.put("backname_2", "back1");


        for (Entry<String, Object> entry : map.entrySet())
        {
            System.out.println("key = " + entry.getKey());
            for (Entry<String, Object> entryi : ((Map<String, Object>) entry
                    .getValue()).entrySet())
            {
                System.out.println("key = " + entryi.getKey());
                for (Entry<String, Object> entryj : ((Map<String, Object>) entryi
                        .getValue()).entrySet())
                {
                    System.out.println(entryj.getKey() + " = "
                            + entryj.getValue());
                }

            }
        }

        // map.put(key,value);
        // key =components
        // value= {
        // component_1={backurl_1=xxxxxxxxxxx, backdate_1=2010-10-21,
        // backname_1=back1},
        // component_2={backdate_2=2010-10-21, backurl_2=xxxxxxxxxxx,
        // backname_2=back1}
        // }
    }