java list转化为字符串带有分隔符

方法一：

public String listToString(List list, char separator) {
 StringBuilder sb = new StringBuilder();
 for (int i = 0; i < list.size(); i++) {
 sb.append(list.get(i)).append(separator);
 }
 return sb.toString().substring(0, sb.toString().length() - 1);
 }

方法二：

 public String listToString(List list, char separator) {
 return org.apache.commons.lang.StringUtils.join(list.toArray(), separator);
 }

方法三：（java8）

List<String> list1 = Arrays.asList("文学","小说","历史","言情","科幻","悬疑");
String string1 = String.join("-",list1);