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Map with duplicate keys
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Ajay Kadur
Greenhorn
Joined: Jul 16, 2006
Posts: 2
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Hi,
Java reference says that a Map, HashMap or Hashtable does not allow to store multiple entries with a same key. I have the requirement to store multiple entries (basically key-value pairs) into some collection with a same key.
Is there any collection to handle such a situation?
Thanks in advance,
Ajay
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Ilja Preuss
author
Sheriff
Joined: Jul 11, 2001
Posts: 14112
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Jakarta Commons Collections has MultiMaps: http://jakarta.apache.org/commons/collections/apidocs-COLLECTIONS_3_1/org/apache/commons/collections/MultiMap.html
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The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
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Jesper de Jong
Java Cowboy
Bartender
Joined: Aug 16, 2005
Posts: 12953
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You could also just use a Map (HashMap) and for the values you use a List instead of single values.
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subject: Map with duplicate keys
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