java hashtable 排序问题

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Hashtable<String, String> h = new
Hashtable<String, String>();

h.put("6", "666");

h.put("8", "888");

h.put("2", "222");

<br>for
(String key : h.keySet())

　　System.out.println(key);

System.out.println("----------------------------------------------------------");

List<String> v = new
ArrayList<String>(h.keySet());

Collections.sort(v, new
Comparator<Object>() {

　　public
int compare(Object arg0, Object arg1) {

　　　　return
Integer.valueOf(arg0.toString()) - Integer.valueOf(arg1.toString());　　　　// 升序，参数顺序对调时降序<br>　　}

});

for (String key : v)

　　System.out.println(key + " "
+ h.get(key));