entrySet遍历map

        Map<String, String> map = new HashMap<String, String>();        map.put("AA", "aa");        map.put("BB", "bb");        map.put("CC", "cc");        map.put("DD", "dd");        // 返回此映射中包含的映射关系的 Set集合        Set<Entry<String, String>> set = map.entrySet();        for(Entry<String, String> entry: set)        {            //每个Entry就是map中一个key及其它对应的value被重新封装的对象            System.out.println(entry.getKey() + "    " + entry.getValue());        }        // 运行结果        // AA aa        // BB bb        // CC cc        // DD dd

<pre name="code" class="java">Iterator iter = mapActivity.entrySet().iterator();while (iter.hasNext()) {Map.Entry entry = (Map.Entry) iter.next();Object key = entry.getKey();