List list = new ArrayList();
list.add(new Integer(3));
list.add(new Integer(2));
list.add(new Integer(1));
TreeSet ts = new TreeSet(list);
Iterator it = ts.iterator();

HashMap map = new HashMap();
map.put("2", "じゃいあん");
map.put("1", "のびた");
map.put("3", "しずか");
TreeMap tm = new TreeMap(map);
it = tm.values().iterator();