How to tell if return is JSONObject or JSONArray with JSON-simple (Java)?

Simple Java:

Object obj = new JSONParser().parse(result); 
if (obj instanceof JSONObject) {
    JSONObject jo = (JSONObject) obj;
} else {
    JSONArray ja = (JSONArray) obj;
}

You could also test if the (purported) JSON starts with a [ or a { if you wanted to avoid the overhead of parsing the wrong kind of JSON. But be careful with leading whitespace.

Though it's similar to above one, but their is not default constructor of JSONParser. Error coming was: The constructor JSONParser() is undefined

Use this instead

JsonElement jsonElement = new JsonParser().parse(jsonString);
if (jsonElement.isJsonArray()) {
    //Your Code
} else {
    //Your Code
}