java - How can I get a set of values from a value in a map? -


i have map contains values exist multiple keys. figured needed setup map this: map<integer, set<long>> mymap = new hashmap<integer, set<long>>

i retrieve value key's set of values.

the problem don't know how add long value set in mymap , don't know how check if mymap contains value in it's values' set.

is implementation incorrect?

you need this.

if(mymap.containskey(mykey)){     mymap.get(mykey).add(value); }

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