我对java完全是新手。我如何获得这个jsonobject的键名和键值，并将其传递给我的增量方法？

args = {'property_name':1}

private boolean handlePeopleIncrement(JSONArray args, final CallbackContext cbCtx) {

    JSONObject json_array = args.optJSONObject(0);

    mixpanel.getPeople().increment(key_name, key_value);
    cbCtx.success();
    return true;
}

更新

现在我得到的错误：

Object cannot be converted to Number  
Number value = json_array.get(key);

private boolean handlePeopleIncrement(JSONArray args, final CallbackContext cbCtx) {
     JSONObject json_array = args.optJSONObject(0);

    Iterator<?> keys = json_array.keys();

    while( keys.hasNext() ) {
        String key = (String) keys.next();
        Number value = json_array.get(key);
       // System.out.println("Key: " + key);
       // System.out.println("Value: " + json_array.get(key));
    }

    mixpanel.getPeople().increment(key, value);
    cbCtx.success();
    return true;
}