可以通過2種方法遍歷HashMap

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();

}

或者:

Map map = new HashMap();

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

    Object key = iter.next();

    Object val = map.get(key);

}