java - I can't seem to find the right Collection for my case. Thinking about list of hashmap of list, which appears very abstract -

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i'm trying write programm challenge: https://www.reddit.com/r/dailyprogrammer/comments/2hcwzn/09242014_challenge_181_intermediate_average_speed/

basically, i've gotte point cars pass 4 cameras, , want save time every car has passed specific camera individually.

so far thought process list of hashmap of lists, feel i'm thinking abstract, because not feeling safe collection use @ time (thats why i'm doing exercise mostly).

basically, list consist of various hashmaps of lists. "lowest" lists contain 4 time dates specific car ( data camera one, data camera two, , on). attach list hashmap, have specific plate of car key. "highest" collection list include hashmaps, list store car plates store data each camera.

i feel made little bit hard follow, painted mindmap you: https://i.imgur.com/sxgltvx.png

i hope can point me in right direction.

for speed limit, need number... maybe use double?
cameras, need array or list of distance (ints). either adt fine

track if car speeding, can use map<string,date> record last position. then, process each set of camera data, can use map last data, speeding calculations, , put new data map when you're processing next camera data, date.

that's how might design it... make sense?


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