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import java.util.Scanner;

public class BankOperations implements IBankAccountOperation {
    private int initialBalance = 0;

    public static void main(String[] args) {
        BankOperations bankOperations = new BankOperations();
        bankOperations.showBalance();
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the amount to deposit: ");
        int depositAmount = scanner.nextInt();
        bankOperations.depositFunds(depositAmount);

        System.out.print("Enter the amount to withdraw: ");
        int withdrawAmount = scanner.nextInt();
        bankOperations.withdrawFunds(withdrawAmount);

        scanner.close();
    }

    @Override
    public void showBalance() {
        System.out.println("Your current balance is: " + initialBalance);
    }

    @Override
    public void depositFunds(int amount) {
        initialBalance += amount;
        System.out.println("You have deposited " + amount + ". Your current balance is: " + initialBalance);
    }

    @Override
    public void withdrawFunds(int amount) {
        if (amount > initialBalance) {
            System.out.println("Insufficient balance. Withdrawal canceled.");
        } else {
            initialBalance -= amount;
            System.out.println("You have withdrawn " + amount + ". Your current balance is: " + initialBalance);
        }
    }
}

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public List<GroceryItem> calculateInvoice(List<GroceryItem> purchasedItems, Map<String, Double> prices, Map<String, Double> discounts) {
    List<GroceryItem> invoiceItems = new ArrayList<>();

    for (GroceryItem purchasedItem : purchasedItems) {
        String itemName = purchasedItem.getItemName();
        int quantity = purchasedItem.getQuantity();

        // Calculate the total price for the item, including the discount.
        double price = prices.get(itemName);
        double discount = discounts.getOrDefault(itemName, 0.0);
        double totalPrice = price * quantity - discount * quantity;

        // Create a new GroceryItem object for the invoice.
        GroceryItem invoiceItem = new GroceryItem(itemName, quantity, price, totalPrice);
        invoiceItems.add(invoiceItem);
    }

    // Sort the invoice items in ascending order by product name.
    invoiceItems.sort(Comparator.comparing(GroceryItem::getItemName));

    return invoiceItems;
}

Grocery items code

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Total stream SQL

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SELECT c.title AS category_title, p.title, SUM(p.stock_number) AS total_stock
FROM categories c
JOIN products p ON c.id = p.category_id
GROUP BY c.title, p.title
HAVING SUM(p.stock_number) > 10
ORDER BY category_title ASC, p.title ASC, total_stock


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SELECT
    A.email AS "email account",
    COUNT(O.account_id) AS "outputs",
    SUM(LENGTH(O.output) - LENGTH(REPLACE(O.output, ' ', '')) + 1) AS "total words",
    ROUND(SUM(LENGTH(O.output) - LENGTH(REPLACE(O.output, ' ', '')) + 1) / COUNT(O.account_id), 2) AS "avg words per output"
FROM accounts A
LEFT JOIN results O ON A.id = O.account_id
GROUP BY A.email
ORDER BY A.email ASC;