code: public Object get(String key) throws JSONException {
      Object o = opt(key);
      if (o == null) {
        throw new JSONException("JSONObject[" + quote(key) + "] not found.");
      }
      return o;
    }
docs: Get the value object associated with a key.
  
  @param key
  A key string.
  @return The object associated with the key.
  @throws JSONException
  if the key is not found.