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https://issues.apache.org/jira/browse/COLLECTIONS-356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13830963#comment-13830963
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Radford Tam commented on COLLECTIONS-356:
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Yes, I've been considering this. I've already had to override much of the test
code for BidiMap while writing the unit test, because a lot of it assumes the
one-to-one relationship.
Let me think more on it.
> Request for a Many-to-Many BidiMap
> ----------------------------------
>
> Key: COLLECTIONS-356
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-356
> Project: Commons Collections
> Issue Type: New Feature
> Components: Collection
> Reporter: Franz Wong
> Priority: Minor
> Fix For: 4.x
>
>
> Currently, BidiMap supports one to one relationship. However, in real life,
> there are many many-to-many relationships. Take an example of student and
> course. One student can take many courses while one course contain many
> students. It would be useful to have a class to manipulate such situation.
> The work around currently is using 2 hash maps.
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