HashMap遍历的两种方式

第一种:

Map map = new HashMap();

Iterator iter = map.entrySet().iterator();

while (iter.hasNext()) {

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

    Object key = entry.getKey();

    Object val = entry.getValue();

}

第二种:

Map map = new HashMap();

Iterator iter = map.keySet().iterator();

while (iter.hasNext()) {

    Object key = iter.next();

    Object val = map.get(key);

}