Scanner uses

Answer 1

Scanner words = new Scanner(System.in);
String name = words.nextLine();

Scanner nums = new Scanner(System.in);
int age = nums.nextInt();

Not sure of the question

Answer 2

it is java class use for read input from user.

Answer 3

https://code.sololearn.com/cRd6Isg28XRX/?ref=app see this code