Do I have to Google Sign everytime to upload a Video to Youtbe using Java?

public static Credential authorize(final NetHttpTransport httpTransport) throws IOException {    InputStream in = new FileInputStream(CLIENT_SECRETS);    GoogleClientSecrets clientSecrets =    GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));    GoogleAuthorizationCodeFlow flow =    new GoogleAuthorizationCodeFlow.Builder(httpTransport, JSON_FACTORY, clientSecrets, SCOPES)        .setAccessType("offline")        .build();    int defaultPort = 5005;    LocalServerReceiver customReceiver = new LocalServerReceiver.Builder()        .setHost("localhost")        .setPort(defaultPort)        .build();    Credential credential = new AuthorizationCodeInstalledApp(flow, customReceiver).authorize("userid");    return credential;}public static YouTube getService() throws GeneralSecurityException, IOException {    final NetHttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();    Credential credential = authorize(httpTransport);    return new YouTube.Builder(httpTransport, JSON_FACTORY, credential)        .setApplicationName(APPLICATION_NAME)        .build();}

So Everything works for me but i need to login everytime which I would prefer not doing. Is it possible to modify the code or anything else so it does that automaticly with given Email and password?