How to get a certain elements inside an array inside a jsonObject

Question

I'm exporting some data in java using JSON then I'm reading that data and trying to get elements from an array inside the JSON object but I'm having issues.

I have tried a lot of things like

jsonObject.get("InGameCord").get("x")
Object Testo = jsonObject.get("InGameCord");
Testo.x

Things like that along with more that did not work so deleted the code.

This is the exported JSON file and im trying to access the InGameCord array X or Y.

{"BaseID":1,"BaseName":"Bandar-e-Jask Airbase","InGameCord":[{"x":463,"y":451}]}

Here is my file reader code

FileReader reader = new FileReader(filename);
JSONParser jsonParser = new JSONParser();
JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);
System.out.println(jsonObject);
System.out.println("BaseName: "+jsonObject.get("BaseName"));
System.out.println("BaseID: "+jsonObject.get("BaseID"));
System.out.println("InGameCord: "+jsonObject.get("InGameCord"));

All of this works and exports the correct info.

So I'm trying to get let us say the X value of InGameCord.

int X = 463;

Answer 1

Given your JSON data {"BaseID":1,"BaseName":"Bandar-e-Jask Airbase","InGameCord":[{"x":463,"y":451}]}:

• "InGameCord" is the name of an array which can be instantiated as a JSONArray.
• That array contains only one element: {"x":463,"y":451}.

• That array element can be instantiated as a JSONObject. It contains two name/value pairs:

  • "x" with the value 463.
  • "y" with the value 451.

So based on the code you provided, to instantiate the JSONArray:

JSONArray numbers = (JSONArray) jsonObject.get("InGameCord");

To retrieve the first (and only) element of the array into a JSONObject:

JSONObject jObj = (JSONObject) numbers.get(0);

To get the value for "x" into an int variable cast the Object returned by get() to a Number, and then get its intValue():

int value = ((Number) jObj.get("x")).intValue();

You can even do the whole thing in one line, but it's ugly:

int y = ((Number) ((JSONObject) numbers.get(0)).get("y")).intValue();