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	<title>Mark Gregory Turansky &#187; Performance</title>
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		<title>Be mindful of Collection.contains(obj)</title>
		<link>http://blog.markturansky.com/archives/129</link>
		<comments>http://blog.markturansky.com/archives/129#comments</comments>
		<pubDate>Fri, 08 May 2009 19:35:50 +0000</pubDate>
		<dc:creator>Mark Turansky</dc:creator>
				<category><![CDATA[Code Hints]]></category>
		<category><![CDATA[Engineering]]></category>
		<category><![CDATA[HOW TO]]></category>
		<category><![CDATA[Performance]]></category>

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		<description><![CDATA[Summary
All Collection.contains(obj) methods are not the same!
This article is a real world case study of the Big O differences between various implementations of Java&#8217;s Collection interface.   I found and fixed a grievous O(n^2) algorithm by using the right data structure.
Background
I was asked to investigate why some pages in our web application would save session data [...]]]></description>
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