CashPayment.java

package cafeteria;
class CashPayment implements Payment {
    private double cashDrawerBalance;

    public CashPayment(double cashDrawerBalance) {
        this.cashDrawerBalance = cashDrawerBalance;
    }

    @Override
    public boolean processPayment(Order order, double amountPaid) throws Exception {
        if (amountPaid < 0) {
            throw new Exception("Amount cannot be negative.");
        }
        if (amountPaid >= order.getTotalAmount()) {
            double change = amountPaid - order.getTotalAmount();
            cashDrawerBalance += order.getTotalAmount();
            System.out.println("Payment successful through cash. Change to return: ETB " + change);
            return true;
        } else {
            throw new Exception("Insufficient cash. Try again.");
        }
    }

    public double getCashDrawerBalance() {
        return cashDrawerBalance;
    }
}