Convert Set> to HashMap

Question

At one point in my code, I created a Set> from a map. Now I want to recreate the same map form, so I want to convert the HashS

Answer 1

Fairly short Java 8 solution. Can cope with duplicate keys.

    Map map = new HashMap<>();
    //fill in map
    Set> set = map.entrySet();
    Map mapFromSet = set.stream().collect(Collectors.toMap(Entry::getKey,
      Entry::getValue,
      (a,b)->b));

Edit: thanks to shmosel who deserves more credit than I do for this