Develop Reference

how to know if a json object contains a json object

I am a novice in java and I am looking for a way to know if a json object contains another jsonObject by using json.org library (not json.org.simple).
For the moment I am using this :
JSONObject json= new JSONObject();
json.has("JsonFieldName");
but but I need to know if there is a way to not specify the Json field Name
If you have a better solution with Json.org, I will take.
Thanks

You can get an Iterator for all the keys in the object from keys, and loop through them seeing if any of the values for the keys is a JSONObject (as opposed to a JSONArray or primitive).
for (String key : json.keys()) {
if (json.get(key) instanceof JSONObject) {
// Yes, it contains at least one JSONObject, whose key is `key`
}
}

How to parse a jsonObject or Array in Java

I have an API request from my CRM that can either return a jsonObject if there is only one result, or a jsonArray if there are multiple results. Here are what they look like in JSON Viewer
JsonObject:
JsonArray:
Before you answer, this is not my design, it's my CRM's design, I don't have any control over it, and yes, I don't like how it is designed either. The only reason I am not storing the records in my own database and just parsing that, which would be MUCH easier, is because my account is having issues not running some workflows that would allow me to auto add the records. Is there any way to figure out if the result is an object or an array using java? This is for an android app by the way, I need it to display the records on the phone.

You should use OPT command instead of GET
JSONObject potentialObject=response.getJsonObject("resuslt")
.getJsonObject("Potentials");
// here use opt. if the object is null, it means its not the type you specified
JSONObject row=potentialObject.optJsonObject("row");
if(row==null){
// row is json array .
JSONArray rowArray=potentialObject.getJsonArray("row");
// do whatever you like with rowArray
} else {
// row is json object. do whatever you like with it
}

ONE
You can use instanceof keyword to check the instances as in
if(json instanceof JSONObject){
System.out.println("object");
}else
System.out.println("array");
TWO
BUT I think a better way to do this is choose to use only JSONArray so that the format of your results can be predicated and catered for. JSONArrays can contain JSONObjects. That is they can cover the scope of JSONObject.
For example when you get the response (either in a JSONObject or a JSONArray), you need to store that in an instance. What instance are you going to store it in? So to avoid issues use JSONArray to store the response and provide statements to handle that.
THREE
Also you can try method overloading in java or Generics

Simplest way is to use Moshi, so that you dont have to parse, even in the case of the Model changing later, you have to change your pojo and it will work.
Here is the snippet from readme
String json = ...;
Moshi moshi = new Moshi.Builder().build();
JsonAdapter<BlackjackHand> jsonAdapter = moshi.adapter(BlackjackHand.class);
BlackjackHand blackjackHand = jsonAdapter.fromJson(json);
System.out.println(blackjackHand);
https://github.com/square/moshi/blob/master/README.md

javax.json: Adding a value to a javax JsonValue

I am trying to add a value to a list of JsonValue. Is it possible to do this?
A bit of background, I am retrieving a Json response from a Rest API, within this Json is a list of Names like this:
{
"Name" : {Name1, Name2, Name3, ...}
}
I need to add another name to list so I can modify names through the Rest API. You are able to perform this task as I have it working in PowerShell, however I can not use PowerShell in the final program.

You can't modify JSONObject as it is immutable.
You might want to explore GSON API to update JSONObject.

use Scala to get JSON data in lower levels

I'm a beginner of Scala, and I have JSON data formatted like below:
{
"index_key": {
"time":"12938473",
"event_detail": {
"event_name":"click",
"location":"US"
}
}
}
I'm trying to get the content of "index_key" and extract the content of second level as a new JSON objet and initiate a class based on the second level data.
{
"time":"12938473",
"event_detail": {
"event_name":"click",
"location":"US"
}
}
I tried to use json4s to extract from the above json to be a Event class, but how to get rid of the "index_key" which is the first level key?
case class Detail(event_name: String, location: String)
case class Event(time: String, event_detail: Detail)
json.extract[Event]
I've read json4s documentation, and also http://www.scala-lang.org/api/2.10.3/index.html#scala.util.parsing.json.JSON$, but still don't quite get it, as it seems the pre-defined json should be fit for the parser?
Could anyone please tell me how to get the second level data (or any lower level) of the json structure?

You can use \ to get to the object you want to extract:
val json = parse(str) \ "index_key"
json.extract[Event]

Converting JSONObject to JSON using GSON

I am having an Java Object which consist many type of variables including a JSONObject.
Whan i debug my object i got the following String for JSONObject:-
{"INCLUSIONS":{"OPTIONS":[{"display":"Complimentary stay for children under 5 without extra bed"}]}}
But when i used:-gson.toJson(JSONObj),I got following
{"myHashMap":{"INCLUSIONS":{"myHashMap":{"OPTIONS":{"myArrayList":[{"myHashMap":{"display":"Complimentary stay for children under 5 without extra bed"}}]}}}}}
Someone please can elaborate why it is converting JSONObject to Map & list ??
Or Any work Around ??
Thanks.

Just use myJsonObj.toString() instead of myJsonObj.toJSON()
Your problem happens because a JSONObject is stored as a HashMap to allow the programmer to reach values with methods based on keys. As example,
String jsonStr = "{'key': 'value'}";
JsonObject json = gson.fromJson(jsonStr, JsonObject.class);
String value = json.get("key").getAsString();
You can figure that json attributes are stored as a HashMap<JsonElement>