การตรวจจับตัวเลขที่หายไป

public class CoffeeSalesExample {
    private record CoffeeSales(LocalDate date, String coffeeName,
            String paymentMethod, Integer quantity, Double amount) {
    }

    public static void main(String[] args) {
		CoffeeSales sale = new CoffeeSales(LocalDate.of(2024, 3, 1), "Latte", "cash", null, null);

		// Check if the sale quantity is null
        if (Objects.____(sale.____())) {
        	System.out.println("Missing quantity");
        }
    	
        // Check if the sale amount is null
        if (Objects.____(sale.____())) {
        	System.out.println("Missing amount");
        }
    	
        // Set a default value of 1 for sale quantity
        int defaultQuantity = Optional.____(sale.quantity()).____(1);
        System.out.println("Default quantity: " + defaultQuantity);
    }
}