Loop a map and multiply value by lets say 20 in Java8

Question

How to loop a map elements and multiply value by lets say number 20 in java8 and get result?

I don't want to loop in usual for loop i want to make it efficient.

Possible duplicate of [How to efficiently iterate over each entry in a 'Map'?](https://stackoverflow.com/questions/46898/how-to-efficiently-iterate-over-each-entry-in-a-map) — Bennett Dams, Jul 10 '18 at 13:32

score 3 · Accepted Answer · answered Jul 10 '18 at 13:31

3

You can use replaceAll if you want to mutate the map itself:

myMap.replaceAll((k, v) -> v * 20);

or collect to a new map:

myMap.entrySet()
     .stream()
     .collect(Collectors.toMap(Map.Entry::getKey, e -> e.getValue() * 20));

answered Jul 10 '18 at 13:31

Ousmane D.

1 Answers1