login to facebook api

I have facebook java ap开发者_运维技巧i. Using this how can I login if i have email and password?

• Java : http://programmaremobile.blogspot.com/2009/01/facebook-java-apieng.html
• PHP: http://www.merchantos.com/makebeta/facebook/facebook-php-tutorial/

Update:

For authentification, you can look how to use oauth 2.0:

http://developers.facebook.com/docs/authentication

You can use the facebook-java-webapp for that:

http://code.google.com/p/facebook-java-webapp/#OAuth_v2