Check if a particular JSON Object is available or not

Question

I have JSON File as below which has to be dumped into an ArrayList:

{
 \"main1\" : [
  {
     \"child1\" : valueA,
     \"child2\" : valueB,
     \"child3\" : va         


        

Answer 1

getJSONObject("child2");

Will throw an exception if child2 does not exist. Try this instead:

getchild2 = jArray.getJSONObject(j).optJSONObject("child2");

That way you don't have to catch an exception if child2 doesn't exist and can instead check for null.

Answer 2

Anyway, I got the solution with some Googling: I re-framed it as,

 if (!jArray.getJSONObject(j).has("child2")) {
  map.put("Second Value", "N.A");
 } else {
  map.put("Second Value", jArray.getJSONObject(j).getString("child2"));
 }

Creating the JSONObject getchild2 = jArray.getJSONObject(j).getJSONObject("child2"); was rather, unnecessary.

And this works, rather perfectly! Refer this for more details: Checking if exists subObject in JSON

Thanks everyone for the help!

Answer 3

Try this:

{"main1" : [{
             "id":"1"
               "child1" : "valueA",
               "child2" : "valueB",
               "child3" : "valueC",
            }, {
                "id":"2"
                  "child1" : "value1",
                 "child3"  : "value3",
           }]
}