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Hash Map

3 replies on 1 page. Most recent reply: Mar 19, 2005 8:44 PM by Matt Gerrans

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Lal Bahadur

Posts: 2
Nickname: la19
Registered: Mar, 2005

Hash Map Posted: Mar 17, 2005 10:38 PM
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We can have one null keys and null value in HashMap but not in Hashtable?What thr reason behind it ?


Lal Bahadur

Posts: 2
Nickname: la19
Registered: Mar, 2005

Re: Hash Map Posted: Mar 17, 2005 10:41 PM
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Because its not syncronized whereas Hastables are synchronized.

Rajagopal

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Nickname: rajagopaly
Registered: Mar, 2005

Re: Hash Map Posted: Mar 18, 2005 3:38 AM
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What's The Relationship between having null values/keys and Synchronization?

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: Hash Map Posted: Mar 19, 2005 8:44 PM
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A HashMap allows more than one null value. Naturally, it allows only one particular key value once, whether it is null or anything else, otherwise there's a serious bug in it.

And as Rajagopal says, what would that have to do with threading? Don't want two threads working on the null value at the same time? ;)

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