Is there an easy way to encrypt a java object?

I'd like to store a serialized object to a file however I'd like to make it encrypted. It doesn't need to be really strong encryption. I just want something easy (preferably a couple lines of code max)that will make it a bit more difficult for someone else to load. I've looked into SealedObject but the key's are holding me up. Ideally I'd like to just pass a String as the key to encrypt / decrypt the object.

Any suggestions?