convert json into map in java example

1public static Map<String, Object> jsonToMap(JSONObject json) throws JSONException {
2    Map<String, Object> retMap = new HashMap<String, Object>();
3
4    if(json != JSONObject.NULL) {
5        retMap = toMap(json);
6    }
7    return retMap;
8}
9
10public static Map<String, Object> toMap(JSONObject object) throws JSONException {
11    Map<String, Object> map = new HashMap<String, Object>();
12
13    Iterator<String> keysItr = object.keys();
14    while(keysItr.hasNext()) {
15        String key = keysItr.next();
16        Object value = object.get(key);
17
18        if(value instanceof JSONArray) {
19            value = toList((JSONArray) value);
20        }
21
22        else if(value instanceof JSONObject) {
23            value = toMap((JSONObject) value);
24        }
25        map.put(key, value);
26    }
27    return map;
28}
29
30public static List<Object> toList(JSONArray array) throws JSONException {
31    List<Object> list = new ArrayList<Object>();
32    for(int i = 0; i < array.length(); i++) {
33        Object value = array.get(i);
34        if(value instanceof JSONArray) {
35            value = toList((JSONArray) value);
36        }
37
38        else if(value instanceof JSONObject) {
39            value = toMap((JSONObject) value);
40        }
41        list.add(value);
42    }
43    return list;
44}