How to downgrade from 10.10

I have try to use Mac OS 10.10, it is good, but I need use java for my class, so I have to downgrade to the 10.9. But I dont know how to do it.

http://www.macworld.com/article/2458050/how-to-revert-to-mavericks-from-the-yose mite-public-beta.html
OS X Mavericks: Erase and reinstall OS X
"Always back up your computer before installing pre-release software. If you need help returning your Mac to a shipping version of OS X and restoring from your Time Machine back up, you can call AppleCare to speak to a support specialist, or reference online documentation. If you wish to return to a shipping version of OS X, we recommended that you wait until the final version of OS X Yosemite is available. OS X Yosemite is coming this Fall, and it will be a free upgrade that you can install over your current installation. If you must remove the beta software from your computer, you will need to erase, install, and restore the Time Machine backup of Mavericks that you created before you installed the OS X Yosemite Beta. Any changes to your files and documents since you installed the OS X Yosemite Beta will not be preserved when restoring your Mavericks backup, so be sure to copy any new or changed files before you begin restoring from your Mavericks backup. "  from https://appleseed.apple.com/sp/betaprogram/faq
Learn more about how to erase and install OS X
Learn more about restoring from a Time Machine backup

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