How to set my Name in smack?

Question

I can use connection.getRoster(),getName to get roster names of contact. But how to set the name of current authenticated account?

Answer 1

Log in with a different account? :)

Seriously, your account name is tied to your authentication, and there's no way to force the other side to use a particular nickname for you, but if both sides implement XEP-172, you can send a hint to the other side when you subscribe:

<presence from='narrator@moby-dick.lit' to='starbuck@moby-dick.lit' type='subscribe'>
  <nick xmlns='http://jabber.org/protocol/nick'>Ishmael</nick>
</presence>