java - Convert Set<Map.Entry<K, V>> to HashMap<K, V>

Question

At one point in my code, I created a Set<Map.Entry<K, V>> from a map. Now I want to recreate the same map form, so I want to convert the HashSet<Map.Entry<K, V>> back into a HashMap<K, V>. Does Java have a native call for doing this, or do I have to loop over the set elements and build the map up manually?

Answer 1

Simpler Java-8 solution involving Collectors.toMap:

Map<Integer, String> mapFromSet = set.stream()
    .collect(Collectors.toMap(Entry::getKey, Entry::getValue));

An IllegalStateException will be thrown if duplicate key is encountered.