how does scanner work

Answer 1

when java scanner just scans the user input or the thing you specified to scan(scan = analysis or read) and takes it or located it to where you want it to be stored;

E.g: telling scanner to take user input and place some where;

Scanner sc = Scanner (System.in)//system.in is saying that you are taking input

String name;
System.out.println("Enter you name: ");
name = sc.next();//this is telling it to place the user input into this variable.

E.g setting scanner to be a variable:

String str = " abcdefghijklmnopqrstuvwxyz";
Scanner sc = new Scanner(str);

Answer 2

Scanner sc = new Scanner(System.in);
int c = sc.nextInt();
sc.close();

above code will wait until the user enters a Integer.
after user enter the integer it will assign it to c;
similarly, other data types can also be read..