How to get telegram username?

Question

Java

I am making a Telegram bot and would like to get the username after writing "/start".
ChatId I was able to get through gatChatId.
But with UserName there was a misunderstanding. How to get it?
Thanks in advance!

Answer 1

To get a username, write:
update.getMessage().getFrom().getUserName()
But the user may not have a username. However, you can find out his "first name" and "last name":
update.getMessage().getFrom().getFirstName()
update.getMessage().getFrom().getLastName()
In addition, you can also extract information about the language of his system from the user:
update.getMessage().getFrom().getLanguageCode()
Returns a string in IETF format , for example "ru" for Russian