遍历一个HashMap

可以通过2种方法遍历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);

}

一个遍历hashmap的例子：
        HashMap h = new HashMap();
        h.put("1", "1aaaa");
        h.put("2", "2222");

        Iterator it = h.keySet().iterator();
        while (it.hasNext()) {
            Object obj = it.next();
            System.out.println(obj + ": " + h.get(obj));
        }