How to backup ArrayList in Java?

Question

I have some data stored as ArrayList. And when I want to backup this data,java bounds two objects forever. Which means when I change values in data ArrayL

Answer 1

It sounds (if I interpret your question properly; it's a little tough) like you're not copying the data that you're referring to in your ArrayList to your backup; you're copying the reference.

It's hard to say exactly how to solve your problem without knowing what your data type is that you're storing / backing up, but just be sure that you're copying the elements of the data contained within the ArrayList. That would mean, among other things, to do things like perform a clone() on the elements of the list, but not on the ArrayList (because that'll create a new cloned list with copies of the references to the same objects).