StackOverflow2013

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PO
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Id
8876205
data
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0
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0
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2012-01-16T05:47:18.940
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2012-01-16T07:35:39.293
LastEditDate
2017-05-23T11:47:29.467
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-1
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201648
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8875680
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2
Score
1
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text
Body
At the risk of stating the obvious (or being plain wrong) isn't the difference that <blockquote> The synchronization wrappers add automatic synchronization (thread-safety) to an arbitrary collection </blockquote> <a href="http://docs.oracle.com/javase/tutorial/collections/implementations/wrapper.html" rel="nofollow noreferrer">http://docs.oracle.com/javase/tutorial/collections/implementations/wrapper.html</a> and continues to say <blockquote> A collection created in this fashion is every bit as thread-safe as a normally synchronized collection, such as a Vector. </blockquote> You may like to see this thread for issues regarding HashMaps and concurrency - <a href="https://stackoverflow.com/questions/1003026/hashmap-concurrency-issue">Hashmap concurrency issue</a> (or you are possibly very much aware of them already). A good example is: <blockquote> The conditions you describe will not be satisfied by HashMap. Since the process of updating a map is not atomic you may encounter the map in an invalid state. Multiple writes might leave it in a corrupted state. ConcurrentHashMap (1.5 or later) does what you want. </blockquote> <a href="https://stackoverflow.com/a/1003071/201648">https://stackoverflow.com/a/1003071/201648</a> I guess in terms of "when should I use this" I would tend to use the syncronised collection where concurrency is required, otherwise you may be creating more work for yourself (see below). In terms of altering the behavior <blockquote> If an explicit iterator is used, the iterator method must be called from within the synchronized block. Failure to follow this advice may result in nondeterministic behavior </blockquote> There are more consequences of using synchronization given at the (Oracle) link provided.
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1. This table or related slice is empty.
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1. PODifference between Hashtable and Collections.synchronizedMap(HashMap)
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 PTQuestion
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1. PTAnswer
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1. USCommunity
UserOwnerUserId
1. USAaron Newton
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