Java - Validaciones Apellidos y NIF

import java.util.regex.Pattern;

import java.util.Scanner;

import java.util.regex.Matcher;

public class RegexTestHarness {

    public static void main(String[] args){

        Scanner in = new Scanner(System.in);

        System.out.printf("%nEnter your regex: ");

        Pattern pattern =

        Pattern.compile(in.nextLine());

        System.out.printf("Enter input string to search: ");

        Matcher matcher =

        pattern.matcher(in.nextLine());

        boolean found = false;

        while (matcher.find()) {

            System.out.printf("I found the text" +

                " \"%s\" starting at " +

                "index %d and ending at index %d.%n",

                matcher.group(),

                matcher.start(),

                matcher.end());

            found = true;

        }

        if(!found){

            System.out.printf("No match found.%n");

        }

        in.close();

    }

}

public void ValidarPassword() {

    boolean passwordCorrecto;

    do {

//

        passwordCorrecto = password.matches("[0-9]{8}[A-Z]{1}");

        if (passwordCorrecto == false) {

            System.out.println("Formato incorrecto");

            System.out.println("Ingresar password:");

            password = ent.nextLine();

            passwordCorrecto = password.matches("[0-9]{8}[A-Z]{1}");

        }

    } while (!passwordCorrecto);

    System.out.println("Direccion electronica valida: "+getUsuario());

    System.out.println("Contraseña valida: "+getPassword());

}