在java中将列表转换为逗号分隔字符串的最佳方法

I have Set<String> result & would like to convert it to comma separated string. My approach would be as shown below, but looking for other opinion as well.

List<String> slist = new ArrayList<String> (result);
StringBuilder rString = new StringBuilder();

Separator sep = new Separator(", ");
//String sep = ", ";
for (String each : slist) {
    rString.append(sep).append(each);
}

return rString;

推荐答案

Java 8 起:

String.join(",", slist);

来自 Apache Commons 库:

import org.apache.commons.lang3.StringUtils

StringUtils.join(slist, ',');