Is it possible to extract the top n (I use top because I believe a TreeMap is sorted) key elements from a TreeMap, without iterating using an Iterator object.
I can do the iteration but it’s tedious to have to check for nulls etc.
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Is it possible to extract the top n (I use top because I believe a TreeMap is sorted) key elements from a TreeMap, without iterating using an Iterator object.
I can do the iteration but it’s tedious to have to check for nulls etc.
Why would you be checking for nulls?
If you use the Google Collections Library you can use Iterables.limit.
EDIT: For some reason the GCL page doesn’t include
limit, but it’s in Guava (which has effectively replaced the GCL) – it’s stillIterables.limit.