Best way to convert list to comma separated string in java

Question

I have Set lt String gt  result  amp  would like to convert it to comma separated string  My approach would be as shown below  but looking for other opinion as well   List lt String gt  slist   new ArrayList lt String gt   result   StringBuilder rString   new StringBuilder     Separator sep   new Separator          String sep         for  String each   slist        rString append sep  append each      return rString

User · Answer

The Separator you are using is a UI component  You would be better using a simple String sep

User · Answer

You could count the total length of the string first  and pass it to the StringBuilder constructor  And you do not need to convert the Set first   Set lt String gt  abc   new HashSet lt String gt     abc add  A    abc add  B    abc add  C     String separator         int total   abc size     separator length    for  String s   abc        total    s length       StringBuilder sb   new StringBuilder total   for  String s   abc        sb append separator  append s      String result   sb substring separator length        remove leading separator

User · Answer

From Apache Commons library   import org apache commons lang3 StringUtils   Use   StringUtils join slist          Another similar question and answer here

[java] Best way to convert list to comma separated string in java

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