import java.util.Scanner;

public class Login { public void run() { Scanner scan = new Scanner (new File("the\dir\myFile.extension")); Scanner keyboard = new Scanner (System.in); String user = scan.nextLine(); String pass = scan.nextLine(); // looks at selected file in scan

String inpUser = keyboard.nextLine();
String inpPass = keyboard.nextLine(); // gets input from user

if (inpUser.equals(user) && inpPass.equals(pass)) {
    System.out.print("your login message");
} else {
    System.out.print("your error message");
}

} }