scala - Java .map() implementation -


this question has answer here:

please me implement .map function works on list classes/interfaces in java 7. cannot use features of java 8 or external libraries. needs similar scala's function in implementation , return values if possible. (maybe impossible).

this different question so-called "duplicate" because asks different entirely. have tried find implementation of function or pointers on putting 1 together, no luck. have asked here , had no luck in implementing suggestions or code given. has been said "trivial" function, , yet, evades me.

to groupby in java 7 have this.

map<k, list<v>> map = new hashmap<>(); for(v v : charges) {     k k = v.getcc();     list<v> values = map.get(k);     if (values == null)         map.put(k, values = new arraylist<>());     values.add(v); }

of course easier in java 8.


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