java - How to prepare list which contains list objects? -


i fetching records database , value this

1,"a" 1,"b" 2,"c" 3,"d" 3,"e" 4,"f"

here got result resultset want prepare list like

[[a,b],[c],[d.e],[f]]

any 1 can me how solve this, tried list , map concept getting last list object only. thanks

you need use map, use integer key, , list<string> value. perform check each key encountered map contains list (empty or otherwise). if doesn't first add list, append value list.

you investigate multimaps


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