java遍历Map取值

1.

Map map = new HashMap();

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

        while (it.hasNext()) {

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

            Object key = entry.getKey();

            Object value = entry.getValue();

    }

2.

Map map = new HashMap();

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

       while (it.hasNext()){

        String key;

        key=(String)it.next();

        logger.info("email-" + key + ":" + map .get(key));

       }
3.

Object  指的是keySet的参数类型 例如：String  long  int

Map map = new HashMap();

    for(Object m: map .keySet()){

        logger.info("email-" + m+ ":" + map .get(m));

       }