30条回答 默认 最新
- 程序go 2008-09-02 23:02关注
There are several differences between
HashMap
andHashtable
in Java:Hashtable
is synchronized, whereasHashMap
is not. This makesHashMap
better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones.Hashtable
does not allownull
keys or values.HashMap
allows onenull
key and any number ofnull
values.One of HashMap's subclasses is
LinkedHashMap
, so in the event that you'd want predictable iteration order (which is insertion order by default), you could easily swap out theHashMap
for aLinkedHashMap
. This wouldn't be as easy if you were usingHashtable
.
Since synchronization is not an issue for you, I'd recommend
HashMap
. If synchronization becomes an issue, you may also look atConcurrentHashMap
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