java - 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"));
        }
    }
}

question from:https://stackoverflow.com/questions/12585492/how-to-test-if-a-jsonobject-is-null-or-doesnt-exist

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.
      }