how to install java

Mac Pro is a desktop machine, and MacBook Pro is a notebook machine. The solution for the problem is the same. If you are running 10.7.2, Java installation can be found here: http://support.apple.com/kb/DL1421

If a future update for Java can be found, check

http://support.apple.com/downloads/

in addition to Apple menu -> Software Update. Generally, I would not download from either unless my data is backed up first*:

http://www.macmaps.com/backup.html