Restock.java

import java.util.*;

public class Restock
{
    static void restock()
    {

        Scanner in = new Scanner(System.in);
        Inventory inv = Inventory.getInstance();
        char action;

        System.out.println(inv);

        while(true)
        {
            System.out.println("(S)can/(N)ew Item/(E)nd");
            action = in.nextLine().charAt(0);
            action = Character.toUpperCase(action);

            switch (action)
            {
                case 'S':
                    scanItem();
                    break;
                case 'N':
                    newItem();
                    System.out.println("New item added");
                    break;
                case 'E':
                    return;
                default:
                    System.out.println("Choice not valid, please try again.");
            }
        }
    }

    private static void scanItem()
    {
        Scanner stdin = new Scanner(System.in);
        Inventory inv = Inventory.getInstance();
        int item, amount;

        while (true)
        {
            try
            {
                System.out.print("What item to scan: ");
                item = Helpers.extractInt(stdin.nextLine(), inv.names.size());
                if (inv.getItemName(item - 1).length() != 0 )
                {
                    try
                    {
                        System.out.print("How many you want to add: ");
                        amount = stdin.nextInt();
                        stdin.nextLine();

                        inv.amounts.set(item - 1, inv.getItemAmount(item - 1) + amount);
                        return;
                    }
                    catch (IndexOutOfBoundsException e)
                    {
                        continue;
                    }
                }
                System.out.println("Not valid item");
            }
            catch (IndexOutOfBoundsException e)
            {
                continue;
            }
        }
    }

    private static void newItem()
    {
        Scanner stdin = new Scanner(System.in);
        Inventory inv = Inventory.getInstance();
        String name;
        int quantity;
        float price;


        System.out.print("Name of new item: ");
        name = stdin.nextLine();

        System.out.print("How many to add: ");
        quantity = stdin.nextInt();
        stdin.nextLine();

        System.out.print("Price of item: ");
        price = stdin.nextFloat();
        stdin.nextLine();


        inv.names.add(name);
        inv.amounts.add(quantity);
        inv.prices.add(price);
    }
}