Converting a Map of subclass values to map of SuperClass values

I am converting a map containing sub class values to a map of super class values using the below listed approach. Is there a better / recommended way to achieve the same?

class SuperClass{
    private String name;
    // getters, setters and copyOf
}

class SubClass extends SuperClass {
    private String id;
    // getters and setters
}

Map<String, SuperClass> superClassMap = subclass
  .entrySet()
  .stream()
  .collect(
    Collectors.toMap(Entry::getKey, entry -> SuperClass.copyOf(entry.getValue()))
  );

>Solution :

If you have Guava, you can get a mapped view like this:

Maps.transformValues(SuperClass:copyOf)

Otherwise, I’d say your way is fine. Or you might prefer this:

Map<String, SuperClass> superClassMap = new HashMap<>();
subclass.forEach((k, v) -> superClassMap.put(k, SuperClass.copyOf(v)));