Can there multiple scanners in one program? Or can they only be declared once

Answer 1

There can be many. But they should wrap around different input streams.

Answer 2

No need multiple scanners for a single input stream. You can create one, and use it through out program for reading input.

see example here :
https://stackoverflow.com/questions/19766566/java-multiple-scanners

https://stackoverflow.com/questions/29053580/cannot-use-multiple-scanner-objects-in-java

https://stackoverflow.com/questions/65503259/should-a-scanner-only-be-instantiated-only-once-if-thats-the-case-why-so

Answer 3

Sololearn doesn't support two Scanners of System.in
but this exsmple works

import java.util.Scanner;

public class Program {
public static void main(String[] args) {
Scanner sc1 = new Scanner("a b c d");
Scanner sc2 = new Scanner("1 2 3 4");
System.out.println( sc1.next() );
System.out.println( sc2.next() );
System.out.println( sc1.next() );
System.out.println( sc2.next() );
}
}