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javahashmapmultimap

Retrieve individual entries of hashmap with same key

I have created a Hashmap which has multiple entries for a single Key entry. Now I want to retrieve all values individually. How can I do this?

I have checked many sites but couldn't get a clue on how to implement it, and an example code snippet can be useful for me.

HashMap<String,String>

  key       value
04302014  04302014
04302014  abc
04302014  10
04302014  20
04302014  20
05302014  05302014
05302014  def
05302014  10
05302014  20
05302014  20

Now using the key I want to retrieve all values individually and store in variables.

Like for key 04302014 I need to extract once and store in variables and in second iteration for the key 05302014.

Solution

  • A Hashmap only has one value for each key, so this will not be possible. You would need a Multimap for this (as in Guava for example), or a Map to a List of values.