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

Regarding the cloning problem, once I solved this by serializing the entire collection into a string then serializing it back out into a new object. This forces you to make all your objects serializable and take when two objects really want to reference a single third object, but it can be a pretty good balance of simplicity and usefulness.

Actually, I haven't tried this but you could probably use a pipe to serialize in and out at the same exact time so that you aren't storing 3 copies in memory (if it's a huge collection)