When do we use synchronized ArrayList? We already have Vector which is synchronized.
When do we use synchronized ArrayList ? We already have Vector which is synchronized.
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When do we use synchronized ArrayList? We already have Vector which is synchronized.
I think that you’ve got this wrong. ArrayList is unsynchronized, Vector is.
Being synchronized means that every operation is thread safe – if you use the same vector from two threads at the same time, they can’t corrupt the state. However, this makes it slower.
If you are working in a single threaded environment (or the list is limited to a thread and never shared), use ArrayList. If you are working with multiple threads that share the same collection, either use Vector, or use ArrayList but synchronize in some other way (e.g., manually or via a wrapper).