Scanning multiple lines using single scanner object

Question

I a newbie to java so please don't rate down if this sounds absolute dumb to you

ok how do I enter this using a single scanner object

5

hello how do you do

welcome to my world

6 7

for those of you who suggest

scannerobj.nextInt->nextLine->nextLine->nextInt->nextInt,,,

check it out, it does not work!!!

thanks

it works with `scannerobj.nextInt->nextLine->nextLine->nextInt->nextLine->nextInt->nextLine..` check it out! — Baby, Apr 08 '14 at 07:03
please give a generic answer meaning which can be used on any set of multiple lines!!! — Creative_Cimmons, Apr 08 '14 at 07:04
Instead of this create separate method to print value and write scanner code there. then call the method in loop and your data — Harshal Patil, Apr 08 '14 at 07:04
@Creative_Cimmons `please give a generic answer meaning which can be used on any set of multiple lines!!!` You might want to add that as a requirement within your question. — Dan Temple, Apr 08 '14 at 07:05
@RafaEl yup it works if and only if you add an extra nextLine for enter part — Creative_Cimmons, Apr 08 '14 at 07:13

score 21 · Accepted Answer · answered Apr 08 '14 at 07:06

public static void main(String[] args) {
    Scanner  in    = new Scanner(System.in);

    System.out.printf("Please specify how many lines you want to enter: ");        
    String[] input = new String[in.nextInt()];
    in.nextLine(); //consuming the <enter> from input above

    for (int i = 0; i < input.length; i++) {
        input[i] = in.nextLine();
    }

    System.out.printf("\nYour input:\n");
    for (String s : input) {
        System.out.println(s);
    }
}

Sample execution:

Please specify how many lines you want to enter: 3
Line1
Line2
Line3

Your input:
Line1
Line2
Line3

Thanks, a plus one for this line `in.nextLine(); //consuming the from input above` — Prashanth kumar, Dec 09 '17 at 03:59

Raghuveer Reddy · Answer 2 · 2017-05-03T06:44:44.763

3

public class Sol{

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in); 

       while(sc.hasNextLine()){

           System.out.println(sc.nextLine());
       }

    }
}

edited May 03 '17 at 06:44

answered May 03 '17 at 06:32

Raghuveer Reddy

41
5

chirr · Answer 3 · 2020-01-26T12:52:57.873

1

By default, the scanner uses space as a delimiter. In order to scan by lines using forEachRemaining, change the scanner delimiter to line as below.

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    scanner.useDelimiter("\n");
    scanner.forEachRemaining(System.out::println);
}

edited Jan 26 '20 at 12:52

answered Jan 26 '20 at 12:42

chirr

21
3

score 0 · Answer 4 · answered Apr 08 '14 at 07:08

0

try this code

Scanner  in    = new Scanner(System.in);

System.out.printf("xxxxxxxxxxxxxxx ");        
String[] input = new String[in.nextInt()];

for (int i = 0; i < input.length; i++) {
    input[i] = in.nextLine();
}

for (String s : input) {
    System.out.println(s);
}

answered Apr 08 '14 at 07:08

Jay kumar

277
2
13

2

That will not work properly, because `in.nextInt()` consumes the int value, but not the line break. So your first for-loop iteration will instantly write that line brake into your input[0]. – ifloop Apr 08 '14 at 07:11

score 0 · Answer 5 · answered Aug 07 '18 at 06:48

0

You can try only with lambda too:

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    scanner.forEachRemaining(input -> System.out.println(input));
}

answered Aug 07 '18 at 06:48

Jouberto Fonseca

33
1
4

score 0 · Answer 6 · answered Sep 25 '19 at 18:49

may be we can use this approach:

for(int i = 0; i < n; i++)
   {
       Scanner sc1 = new Scanner(System.in);
       str0[i] = sc1.nextLine();
       System.out.println(str0[i]);
   }

that is we create the scanner object every time before we read the nextLine. :)

Scanning multiple lines using single scanner object

6 Answers6