Подскажите, почему не работает Main?

public class Solution {
    public static HashSet<Integer> createSet() {
        HashSet<Integer> set = new HashSet<>();
        for (int x = 0; x < 20; x++){
            set.add(x);
        }
        return set;
    }

    public static HashSet<Integer> removeAllNumbersMoreThan10(HashSet<Integer> set) {
        Iterator<Integer> iterator = set.iterator();
        Integer num = iterator.next();
        while (iterator.hasNext()) {
            if (num > 10) iterator.remove();
        }
        return set;
    }

    public static void main(String[] args) {
       removeAllNumbersMoreThan10(createSet());
        for (Integer numa:createSet()) {
            System.out.println(numa);
        }

    }
}