How can i prompt a user to enter a 4 digit pin?

Question

I want to use loops, incase the user enters a pin greater or less then 4 digits I have been advised to use if statements and String but I'm struggling to get it right

Answer 1

String pass = "****";

// take input

if( pass.length() != 4){
System.out.println("try new pin with 4 digit");
}else{
// your code
}

Answer 2

this is my code

System.out.println("Please enter your four digit pin");
Scanner input = new Scanner (System.in);
pin = input.nextInt();
String input = "****";

if (Input.length() != 4)
{ System.out.println("Error")
}
else
{ System.out.println("please continue")
}

// when the user enters more then 4 digits the error message does not print to screen the program continues to run and the message please continue is displayed