Java中将List＜String＞转化为以,分割的字符串或相反(转载)

• 将逗号分隔的字符串转换为List

List list = Arrays.asList(str.split(","));
List list = Arrays.asList(StringUtils.split(str, ","));

• 将list转化为逗号分割的字符串

String str = String.join(",", list);
String str = StringUtils.join(list.toArray(), ",");