HashMap遍历的两种方法

Map map = new HashMap();

for (Iterator iter = map.entrySet().iterator(); iter.hasNext();) {

  Map.Entry entry = (Map.Entry) iter.next();

  Object key = entry.getKey();

  Object val = entry.getValue();

}

Map map = new HashMap();

for (Iterator iter = map.keySet().iterator(); iter.hasNext();) {

  Object key = iter.next();

  Object val = map.get(key);

}