How to add new Fields/Elements to JsonObject?

Here is my code. It is an attempt to read JSON using the GSON library. ``` JsonReader reader = new JsonReader( new BufferedReader(new InputStreamReader(s3Object.getObjectContent())) ); reader.beginArray(); int gsonVal = 0; while (reader.hasNext()) { JsonParser _parser = new JsonParser(); JsonElement jsonElement = _parser.parse(reader); JsonObject jsonObject1 = jsonElement.getAsJsonObject(); } ``` Now, I need to add 2 additional fields to this `JsonObject`. I need to add `primary_key` field and `hash_index` field. I tried the below, but it didn't work. ``` jsonObject1.add("hash_index", hashIndex.toString().trim()); jsonObject1.add("primary_key", i); ``` When these two values are added, the JsonObject will look like below. ``` { "hash_index": "00102x05h06l0aj0dw", "body": "Who's signing up for Obamacare?", "_type": "ArticleItem", "title": "Who's signing up for Obamacare? - Jan. 13, 2014", "source": "money.cnn.com", "primary_key": 0, "last_crawl_date": "2014-01-14", "url": "http://money.cnn.com/2014/01/13/news/economy/obamacare-enrollment/index.html" } ``` How can I do this? This is my first time with GSON.