dictionary - Java 8 list to map with stream -


i have list<item> collection. need convert map<integer, item> key of map must index of item in collection. can not figure out how streams. like:

items.stream().collect(collectors.tomap(...));

any help?

as question identified possible duplicate need add concrete problem - how position of item in list , put key value

you can create stream of indices using intstream , convert them map :

map<integer,item> map =      intstream.range(0,items.size())              .boxed()              .collect(collectors.tomap (i -> i, -> items.get(i)));

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