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What is the difference between vector & Thread safe arraylist in Java. Vector is synchronized and arraylist is not. But if we make the arrayist thread safe then will it be same like vector ? One difference is that vector grows by 100% where as arraylist grows by 50%. Any difference related to performance or other factor ?

Amritendu Panda
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  • Please label with the _language_ you are using. – Tim Biegeleisen Feb 10 '16 at 05:57
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    Please refer to http://stackoverflow.com/questions/1386275/why-is-java-vector-class-considered-obsolete-or-deprecated and forget Vector unless you are dealing with legacy code. – uncaught_exception Feb 10 '16 at 06:03
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    The difference is that `Vector` has been dead for, like, 20 years now. Pretend you've never heard of it. It's _never_ the right thing to use. In the worst case, use `Collections.synchronizedList(new ArrayList<>())`. – Louis Wasserman Feb 10 '16 at 06:22

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Vectors are really old, I really would never recommend using them. As for thread-safe alternatives to ArrayList you should take a look at Google Guava (Immutable Collections Explained)

ImTomRS
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ArrayList gives better performance as it is non-synchronized. Vector operations gives poor performance as they are thread-safe, the thread which works on Vector gets a lock on it which makes other thread wait till the lock is released.

Read this for more info.

itzmebibin
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  • It would be more correct to say that `Vector` operations are *synchronized.* They aren't thread-safe in the presence of iterators, for example, without external synchronization. – user207421 Feb 10 '16 at 06:30