code: public Boolean[] execute() throws
            IOException,
            SpotifyWebApiException {
      return new Gson().fromJson(new JsonParser().parse(getJson()).getAsJsonArray(), Boolean[].class);
    }
docs: Check whether a user is following a playlist or not.
  
  @return Whether a user is following a playlist or not.
  @throws IOException            In case of networking issues.
  @throws SpotifyWebApiException The Web API returned an error further specified in this exception's root cause.