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From "Gary Gregory (JIRA)" <>
Subject [jira] Commented: (LANG-588) Create a basic Pair<L, R> class
Date Fri, 12 Feb 2010 23:33:27 GMT


Gary Gregory commented on LANG-588:

In the Smalltalk world, this was called an Association with a key and value, so in Java we
could have Association<K,V>.

If you really care about providing immutable assocs, then you can a mutable and immutable

I too have written and re-written many versions of this class through time. This is really
a public version of what the JRE provides in the MapEntry class of course. I usually end up
with Maps of Associations.

> Create a basic Pair<L, R> class
> -------------------------------
>                 Key: LANG-588
>                 URL:
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.*
>            Reporter: Matt Benson
>             Fix For: 3.0
>         Attachments:,
> [lang] is the perfect place to provide a basic typed Pair class.  I have written such
a class for my employer (who hasn't?) but can/will rewrite blind to avoid IP issues.  I think
it's also nice to go ahead and extend this to MatchedPair<T> extends Pair<T, T>
as well.

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