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Comparison of LinkedHashMap & HashMap

 
Keith Nagle
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Hi there.Just looking on page 544 of the (Highly revered )
K&B SCJP book and in relation to LinkedHashMap, I see that
the text states that LinkedHashMap is quicker than HashMap
for adding and removing elements. Im just wondering, how so?
Many thanks & best regards.
K
[ June 19, 2008: Message edited by: Keith Nagle ]
 
marc weber
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Hmmm... According to Eckel's Thinking in Java, Choosing between Maps...
LinkedHashMap is slightly slower than HashMap because it maintains the linked list in addition to the hashed data structure.

Of course, the comparisons Eckel provides come with a disclaimer: "...this will be different according to the computer and JVM you are using..." And if you study the table of test results he provides, you will also see that the size of the Map makes a difference.
 
Keith Nagle
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Great stuff marc.
Thank you very much.
 
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