Java tutorial
import java.util.ArrayList; import java.util.Date; import java.util.HashSet; import java.util.List; import java.util.Set; public class Capture { static <T> Set<T> listToSet(List<T> list) { Set<T> set = new HashSet<T>(); set.addAll(list); return set; } public static void main(String[] args) { List<?> list = new ArrayList<Date>(); Set<?> set = listToSet(list); } }