HashMap的key装换成List

Map<String,Object> map = new HashMap<String,Object>();
map.put("a","32332");
map.put("b","32332");
map.put("c","32332");
List<String> keys =  Arrays.asList( map.keySet().toArray(new String[map.keySet().size()]) );
for(String key:keys)
　　System.out.println(key);