[Java] String and List conversion

1. Convert json string to list

 String blackUids = "[1,2,3,4]";
List<Long> ids = JSONObject.parseArray(blackUids, Long.class);

2. Convert comma separated string to list

 List<Long> uids = Arrays.asList(blackListUids.split(",")).stream().map(uid -> NumberUtils.toLong(uid)).collect(Collectors.toList());

3. convert string to array

 String[] skuIds = skuLevelBonusMergeDTO.getSkuIds().split(",")

4. to be continued