[ubuntu] Tips for updatig java?

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http://ubuntuforums.org – I downloaded the latest update to java. Java 7u21 I moved the file to my home folder but I am having issues with installing the update. My issues stem from my ignorance. So can someone brake down the steps I need to do to get this working? I am on ubuntu 13.04 x64, I already downloaded the latest update and put it in my home folder. I just need to know how to get it to update. Thanks, guys. (Hardware)