{
      "attendees": [
        {
          "email": "x@gmail.com"
        },
        {
          "email": "y@techjini.com"
        }
      ],
      "start": {
        "dateTime": "2017-02-01"
      },
      "end": {
        "dateTime": "2017-02-01"
      }
    }

JSONObject jsobject = new JSONObject();
        JSONObject start = new JSONObject();
        JSONObject end = new JSONObject();
        start.put("dateTime", "2017-02-01");
        end.put("dateTime", "2017-02-01");
        JSONArray attendees = new JSONArray();
        JSONObject email = new JSONObject();
        JSONObject email1 = new JSONObject();
        attendees.put(0, email);
        attendees.put(1, email1);
        email.put("email", "x@gmail.com");
        email1.put("email", "y@gmail.com");
        jsobject.put("start", start);
        jsobject.put("end", end);
        jsobject.put("attendees", attendees);