How do I install Jave files on 7610 ?

"it doesn't work" is not a very descriptive explanation of what you're trying to do and what happens.

Anyway, assuming they are MIDP 1.0 or MIDP 2.0 based Java apps for Series 60 phones (if they aren't, don't even try installing):

- Send the .jar file over Bluetooth and open it from the Inbox or

- Use PC Suite's application installer (with Bluetooth or the DKU-2 USB cable) and point it to the .jar file or

- Use a PC-based memory card reader and put the .jar file on the card, put the card in the phone and use a file manager on the phone (built-in or FExplorer from http://www.gosymbian.com) to open it and start the installation or

- Send the .jar file as an email attachment to an email address/account that you have configured the phone to get email from or

- Put the .jar file on a web or WAP server that you can access with the phone's built-in browser

Also, it might be a good idea to take look at the document called "User's Guide", which was delivered with your phone. While you're at it, see also the PC Suite User's Guide (and get the latest version from http://www.nokia.com/pcsuite).

You might also want to familiarize with this site's search function (so as to be able to locate discussions that already answer questions you won't have to repeat): http://www.allaboutsymbian.com/forum/search.php