Seems more of a blogvertisement for GitHub

Check out the Immutable Maps feature, does the same with some nice syntactic sugar - http://docs.guava-libraries.googlecode.com/git/javadoc/com/g...

You don't even need to use the Builder directly, just use the structure's "of" method:

   ImmutableSet<Foo> foos = ImmutableSet.of(a, few, elements);
   ImmutableMap<Key, Value> map = ImmutableMap.of(k1, v1, k2, v2);

I've studied computer science, but I don't recall this theoretical problem. Perhaps its just not as popular or well known as things like P vs NP?