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    <p>One approach is to create a custom subclass of the Apache Commons <a href="http://commons.apache.org/collections/apidocs/org/apache/commons/collections/map/AbstractHashedMap.html"><code>AbstractHashedMap</code></a> class, overriding the <code>hash</code> and <code>isEqualKeys</code> methods to perform case insensitive hashing and comparison of keys. (Note - I've never tried this myself ...)</p> <p>This avoids the overhead of creating new objects each time you need to do a map lookup or update. And the common <code>Map</code> operations should O(1) ... just like a regular <code>HashMap</code>.</p> <p>And if you are prepared to accept the implementation choices they have made, the Apache Commons <a href="http://commons.apache.org/collections/apidocs/org/apache/commons/collections/map/CaseInsensitiveMap.html"><code>CaseInsensitiveMap</code></a> does the work of customizing / specializing <code>AbstractHashedMap</code> for you.</p> <hr> <p>But if O(logN) <code>get</code> and <code>put</code> operations are acceptable, a <code>TreeMap</code> with a case insensitive string comparator is an option; e.g. using <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#CASE_INSENSITIVE_ORDER"><code>String.CASE_INSENSITIVE_ORDER</code></a>.</p> <p>And if you don't mind creating a new temporary String object each time you do a <code>put</code> or <code>get</code>, then Vishal's answer is just fine. (Though, I note that you wouldn't be preserving the original case of the keys if you did that ...)</p>
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    1. POCase insensitive string as HashMap key
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    1. USStephen C
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    1. COIsn't the first approach same as [link](http://commons.apache.org/collections/apidocs/org/apache/commons/collections/map/CaseInsensitiveMap.html) `CaseInsensitiveMap`? Please advise.
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    2. COMost likely yes, though you could choose to not allow `null` keys if you implemented this yourself.
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    3. COThanks for your input. It helped.
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