Converting a List to comma separated string

Question

Hi I am having a requirement where I need to convert List of Long datatype to comma separated String. Which would be the appropriate way. I have thought about using string builder or converting it to List<String> and then using StringUtils join to get a String.

I am looking for java 7 solution,Not using guava or java 8.

I have tried converting it to list of string and using string utils.join . But i am not sure is this the right way, — user2375298, Oct 29 '15 at 08:51
Okay, that duplicate was about `List`, not `List`, but most answers should still apply. Reopen if not. — Thilo, Oct 29 '15 at 08:53
What bout this approach: String collect = listLong.stream().map(x->String.valueOf(x)).collect(Collectors.joining(",")); listLong is reference for List — ASharma7, Jul 19 '19 at 03:34

score 35 · Answer 1 · edited Jul 31 '19 at 16:33

35

You can try this:

StringUtils.join(mylist, ',');

See org.apache.commons.lang3.StringUtils.

edited Jul 31 '19 at 16:33

risingTide

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answered Oct 29 '15 at 08:51

Rahul Tripathi

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That also works with `List`. The method takes an `Iterable>` – Thilo Oct 29 '15 at 08:55
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I was under wrong assumption that it will work only for List of String Data Types, Thanks – user2375298 Oct 29 '15 at 08:56
@JordiCastilla - I know. But I presume that some *other* people who will be viewing this answer might be using java -8 :) – TheLostMind Oct 29 '15 at 08:57
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@VinodMadyalkar: and these other people will soon find out that StringJoiner does not work with `List`. – Thilo Oct 29 '15 at 09:04
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@Thilo - Ya, they will have to cast longs to strings in some way. Hmm.. Probably not worth mentioning it at all then – TheLostMind Oct 29 '15 at 09:05
It prepended separator when used on Set – r_D Jul 04 '18 at 05:28
issue I am facing is , values IN ( ? ) , It should prepare (v1,v2) but it creates ('v1,v2') , any alternative solutions ? – Vimalkumar Natarajan Sep 12 '18 at 15:32
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It worked with org.apache.commons.lang3.StringUtils import, but NOT with com.sun.deploy.util.StringUtils. – akasha Jun 27 '19 at 10:59

Converting a List to comma separated string

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