How to test if a JSONObject is null or doesn't exist

Question

I have a set of JSONObject values which i receive from a server and operate on. Most times I get a JSONObject with a value (let's say statistics) and sometimes, it returns an Error object with a code and a description of the error.

How do I structure my code so that it doesn't break if it returns the error. I thought I could do this, but doesn't work.

public void processResult(JSONObject result) {     try {         if(result.getJSONObject(ERROR) != null ){             JSONObject error = result.getJSONObject(ERROR);             String error_detail = error.getString(DESCRIPTION);             if(!error_detail.equals(null)) {                 //show error login here             }             finish();         }         else {             JSONObject info = result.getJSONObject(STATISTICS);             String stats = info.getString("production Stats"));         }     } } 

Answer 1

Use .has(String) and .isNull(String)

A conservative usage could be;

    if (record.has("my_object_name") && !record.isNull("my_object_name")) {         // Do something with object.       }