Deleted Java files, now no app opens on iMac

I was running Mavericks on my iMac and a Java update wouldn't allow me to open certain programs. I then deleted all of my Java files from "user/library/...", restarted my computer and now all I get are error messages whenever I try to open an application, including finder. Is the only way to fix this to take it to a repair centre? WIll I lose all data or will they be able to save it if I give them a hard drive with the computer?
Thank you

What are the error messages, and what backups do you have?

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