How to read only one value with Scanner (Java)?

Question

I have multiple Scanner methods to save input, but when I execute the code and enter for example "word 5", the Scanner reads input for the next Scanner method as well. How can I stop that?

    ...
    correctInput = true;
    for (int i = 0; i < runnI; i++) {
        System.out.println(".....");
        array1[i] = sc.next();

        System.out.println(".....");
        do {
            try {
                array2[i] = sc.nextDouble();
                correctInput= false;
            } catch (InputMismatchException e) {
                System.out.println("Wrong");
                sc.next();
            }
        } while (correctInput);
    }

No, it simply goes on with the code, but it doesn't ask the second input... sc.next should be for "word 5" and sc.nextDouble for another number — thequestioneer, Nov 24 '19 at 19:37
You set `array1[i] = sc.next()` so I think that consumes `word`, leaving `5` to be consumed by the call to `sc.nextDouble().` — Willis Blackburn, Nov 24 '19 at 19:47
Yes and that's the problem. "word 5" should be set for array1[] — thequestioneer, Nov 24 '19 at 19:53
The default delimiter for `Scanner` is whitespace, so `sc.next()` will stop at the space after `word`. If you want it to read the whole line, you can call `nextLine`, or, if your input uses some other delimiter (maybe tab or comma) then call `useDelimiter`. — Willis Blackburn, Nov 24 '19 at 20:00
nextLine doesn't work either, when I do this, it just prints the two "......"s and goes on with the code — thequestioneer, Nov 24 '19 at 20:19
Is there actually a line ending? You may need to add one to the end of your input if it's not there. — Willis Blackburn, Nov 24 '19 at 20:23
Not sure what your input *is* but if it's a string you could just do `someString + '\n'`. — Willis Blackburn, Nov 24 '19 at 21:23
This answer has some good points about how Scanner works. Hope it's helpful! https://stackoverflow.com/a/26446609/11226302 — Shivam Puri, Nov 24 '19 at 21:48

score 0 · Answer 1 · answered Nov 25 '19 at 19:15

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So guys, I found out that it works, when I write sc.nextLine() before the first System.out.println() and array1[i] = sc.nextLine() after it

answered Nov 25 '19 at 19:15

thequestioneer

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How to read only one value with Scanner (Java)?

1 Answers1