I need help opening Java!

Hello and thanks in advance for your help.
I recently downloaded Oracle Java 7 because it was needed for an app. Everything was fully functional, however when I turned my computer off, the app stopped working. I know I can open the app by enabling Java 7, however I don't know how to do that. How do I enable and turn on my Java 7?
I currently have the most updated OS X (mountain lion)
Thanks!

Indeed Apple does not have this version 7 of Java yet. Lately Apple has Java updates also at the same time as Oracle, because Java is easily attackable by malware.
a dmg file is just the installer that installs the app. You unmount (eject) this installer after the install, the same way you eject a CDrom.
in Utilities you have the "Java Preferences" applet where you enable or disable Java.
Look also in SystemPreferences/Users&Accounts/LoginItems, is there anything that has the name Java in it?
I would like to know which application asked you to install Java?

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