System.out.println("Type your username: ");
        String username1 = reader.nextLine();

        System.out.println("Type your password: ");
        String password1 = reader.nextLine();

        if (username1.equals("alex"))   {
            if (password1.equals("mightyducks")) {
                System.out.println("You are now logged into the system!");
              if (!(username1.equals("alex")))    {
                  if (!(password1.equals("mightyducks"))) {
                  } else    {
                      System.out.println("Username or password is invalid!");

                    }
                }
            }
        }

    }
}