src/main/java/com/googlecode/objectify/impl/Keys.java
public <T> List<Key<T>> createKeys(final Key<?> parent, final Class<T> kind, final Iterable<?> ids) {
		return StreamSupport.stream(ids.spliterator(), false)
				.map(id -> createKeyAny(parent, kind, id))
				.collect(Collectors.toList());
	}
public <T> List<Key<T>> createKeys(final Key<?> parent, final Class<T> kind, final Iterable<?> ids) {
		return StreamSupport.stream(ids.spliterator(), false)
				.map(id -> createKeyAny(parent, kind, id))
				.collect(Collectors.toList());
	}
Make a list of Key<?>s
@param ids must contain either Long or String