hashtable的遍历

Hashtable<String, String>  table=new Hashtable<String, String>();
table.put("a", "aa");
table.put("b", "bb");
table.put("c", "cc");
Enumeration keys=table.keys();

while(keys.hasMoreElements()){
String key=(String)keys.nextElement();
System.out.println(key+"---"+table.get(key));
}