Map<String, Object> parmMap = new HashMap<String, Object>(); //定義一個用於存儲強轉後的Map List<Map<String, Object>> findActivityList = groupConfigDao.findActivityList(); //查詢List<Map>裏的數據 //List<Map<String, Object>> (findActivityList)轉Map<String, Object>(parmMap) findActivityList.forEach(listMap -> { parmMap.put((String)listMap.get("phone_num"), listMap.get("id")); });