How to convert a string to a sequence of characters using stream API

Question

Can the following code be converted to stream? I have tried this a lot of times but I kind of got stuck in someplace.

Scanner sc = new Scanner(System.in);

while(sc.hasNext()) {
    String line = sc.nextLine();
    line.chars().forEach(i -> System.out.println((char)i));
}

sc.close();

But you alraedy use a Stream there. I don't get which part do you want to convert. — Amongalen, May 22 '20 at 08:52
Does this answer your question? [Why is String.chars() a stream of ints in Java 8?](https://stackoverflow.com/questions/22435833/why-is-string-chars-a-stream-of-ints-in-java-8) — PatrickChen, May 22 '20 at 08:53
I know chars return IntStream but I want to replace while loop as well — , May 22 '20 at 08:55
Did you search before posting this question, in case of stream, this is basic example available in internet. — Sambit, May 22 '20 at 09:00
@Seelenvirtuose I think the votes came in because expectation was to conver `Scanner` next elements to stream which kind of looks hard. — , May 22 '20 at 09:07

score 1 · Accepted Answer · edited Mar 03 '21 at 19:09

Yes, you can create a Spliterator from Scanner which can then be passed to StreamSupport#stream to create an IntStream. Here is an example:

Scanner sc = new Scanner(System.in);

try ( IntStream is = StreamSupport.stream(
            Spliterators.spliterator(sc, Long.MAX_VALUE, Spliterator.ORDERED), false)
        .onClose(sc::close)
        .flatMapToInt(s -> s.chars()); ) {
    is.forEach(i -> System.out.println((char) i));
}

score -1 · Answer 2 · answered May 22 '20 at 08:53

-1

Scanner sc = new Scanner(System.in);

while(sc.hasNext()) {
    String line = sc.nextLine();
    Arrays.stream(line.split(""))
            .forEach(System.out::println);
}

sc.close()

answered May 22 '20 at 08:53

Yudhishthir Singh

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How to convert a string to a sequence of characters using stream API

2 Answers2