public static void main(String[] args) {
        Set<Integer> linkedHashSet = new LinkedHashSet<Integer>();
        linkedHashSet.add(1);
        linkedHashSet.add(2);
        linkedHashSet.add(0);
        linkedHashSet.add(4);
        linkedHashSet.add(8);
        linkedHashSet.add(6);

        System.out.println("linkedHashSet: " + linkedHashSet);

        Set<Integer> hashSet = new HashSet<Integer>(linkedHashSet);
        System.out.println("hashSet: " + hashSet);

        Set<Integer> treeSet = new TreeSet<Integer>(linkedHashSet);
        System.out.println("treeSet: " + treeSet);

    }