import java.io.*;
import java.text.*;
import java.util.*;

public class Store {

/**
* an arraylist to store books and audio books.
*/
static ArrayList<Book> booklist;
static ArrayList<Book> bookcart;

/**
* an arraylist to store the dvd list
*/
static ArrayList<DVD> dvdlist;
static ArrayList<DVD> dvdcart;

//creating a scanner object.
static Scanner scanner=new Scanner(System.in);

/*
* display main menu
*/
public static String mainMenu() {
System.out.println("**Welcome to the Comets Books and DVDs Store**");
while (true) {
   System.out.println("");
   System.out.println("Please select your role:");
   System.out.println(" A - store manager");
   System.out.println(" B - customer");
   System.out.println(" C - exit store");
   System.out.print("Enter choice: ");
   String choice = scanner.nextLine().toUpperCase();
   if (choice.equals("A")) {
   System.out.print("Please enter your username: ");
   String username = scanner.nextLine();
   System.out.print("Please enter your password: ");
   String password = scanner.nextLine();
   try(BufferedReader br = new BufferedReader(new FileReader("credentials.txt"))) {
      for(String line; (line = br.readLine()) != null; ) {
         String[] params = line.split(",");
         if (params.length >= 2) {
         if (params[0].equals(username) && params[1].equals(password)) {
            System.out.println("Password accepted!");
            return "A";
         }
         }
      }
      System.out.println("Password rejected.");
   } catch (Exception e) {
      e.printStackTrace();
   }
   } else if (choice.equals("B")) {
   return "B";
   } else if (choice.equals("C")) {
   return "C";
   } else {
   System.out.println("Error: Invalid input");
   }
}
}

/*
* display option a menu
*/
public static void optionAMenu() {
System.out.println("");
System.out.println("**Welcome to the Comets Books and DVDs Store (Catalog Section)**");
while (true) {
   System.out.println("");
   System.out.println("Choose from the following options:");
   System.out.println(" 1 - Add Book");
   System.out.println(" 2 - Add AudioBook");

Overview For this project you will write static methods that suppo...