Java JSON hashing

jsonHash.java

    private long getJsonHashcode(@NonNull Object json) throws JSONException {
        long result = 15l;
        int multiplier = 27;
        if (json instanceof JSONObject) {
            JSONObject obj = (JSONObject) json;

            for (Iterator<String> iterator = obj.keys(); iterator.hasNext(); ) {
                String key = iterator.next();
                Object value = obj.get(key);
                result = multiplier * result + key.hashCode();
                if (value instanceof JSONArray || value instanceof JSONObject) {
                    result = multiplier * result + getJsonHashcode(value);;
                } else {
                    result = multiplier * result + String.valueOf(value).hashCode();
                }
            }
        } else if (json instanceof JSONArray) {
            JSONArray array = (JSONArray) json;
            for (int i = 0; i < array.length(); i++) {
                Object value = array.get(0);
                if (value instanceof JSONArray || value instanceof JSONObject) {
                    result = multiplier * result + getJsonHashcode(value);
                } else {
                    result = multiplier * result + String.valueOf(value).hashCode();
                }
            }
        }
        return result;
    }