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MultiMap and MultiSet

From: andrew cooke <andrew@...>

Date: Sun, 18 Mar 2012 11:40:37 -0300

Guava (whose iterable related functions are exactly what you need if you are
frustrated that Java is not more like python or Clojure) introduces these two
new data types.
http://code.google.com/p/guava-libraries/wiki/NewCollectionTypesExplained

I hadn't really noticed them before, but MultiSet is like python's Counter (in
collections), which is surprisingly useful, and MultiMap looks like it's the
perfect representation for ad-hoc graphs.

There's a blog (google+) post somewhere explaining how the patches to Guava
are almost never accepted because writing the code is the least of their
worries - they spend a lot more time thinking about the ideas.  And that
really sure.  Guava is not just a useful library; it's one you cna learn from.

Andrew

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