Java joining array of non-String into String with delimiters

Asked Jul 11 '22 at 10:03

Active Jul 11 '22 at 10:34

Viewed 32 times

I have got a POJO/Bean called Person. It has a customized toString() method.

I have also an array of Person called presenters:

Person[] presenters;

I want to join the presenters into one string with delimiter:

String presenters = String.join(", ", (CharSequence[]) presenters);

Note that to join into String, I need to cast presetnters into CharSequence[], but I got this exception:

cannot be cast presenters to [Ljava.lang.CharSequence;

Is there any quick fix for this?

@Federico Thanks for the refer, but array isn't exactly a list.... though I guess I can convert the array to list first.

edited Jul 11 '22 at 10:34

asked Jul 11 '22 at 10:03

user2526586

does `Person` override `toString()` method ? – jhamon Jul 11 '22 at 10:05
1

Try `String presentersStr = Arrays.stream(presenters).map(Person::toString).collect(Collectors.joining(", "));` – Eritrean Jul 11 '22 at 10:11
Well, if your Persons class does not implement the interface CharSequence, I dont see why you expect it to be able to be cast into that. – experiment unit 1998X Jul 11 '22 at 10:26
@jhamon Yes, `Person` overrides `toString()` – user2526586 Jul 11 '22 at 10:30
@Eritrean Thanks. I guess this is the simplest solution. – user2526586 Jul 11 '22 at 10:31

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