java - Offset and limit for a set -


i have 2 ordered sets of integers - sortedset<integer>, call them set1 , set2. need find union of sets , return subset offset 10 limit 10. mean?

set1: 1,2,5,6,7,8,11,21,23,543,1002  set2: 11,12,15,16,17,8,111,121,123,1543,11002  union: 1,2,5,6,7,8,11,21,23,543,1002,12,15,16,17,111,121,123,1543,11002  union offset 10 limit 10: 1002,12,15,16,17,111,121,123,1543,11002

note, cardinalities of 8 , 11 in union 1.

i'm looking algorithm allows me not load entire sets memory (because sets may quite large, not waste server's resources). there way that? maybe instant libraries commons or guava can of?

upd: myself don't use java 8, solution using interesting.

the algorithm quite simple.

 create empty hash create empty array set waste counter 0 iterate sets (2 or more)   iterate set values     if value not in hash       insert value hash       increase waste counter         if waste counter > offset (10)           insert value array           if array length == limit (10)             done - return array

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