NaiveTicket/TicketMachine.java

/**
 * TicketMachine models a naive ticket machine that issues
 * flat-fare tickets.
 * The price of a ticket is specified via the constructor.
 * It is a naive machine in the sense that it trusts its users
 * to insert enough money before trying to print a ticket.
 * It also assumes that users enter sensible amounts.
 *
 * @author David J. Barnes and Michael Kolling
 * @version 2008.03.30
 */

class TicketMachine
{
    // The price of a ticket from this machine.
    private int price;
    // The amount of money entered by a customer so far.
    private int balance;
    // The total amount of money collected by this machine.
    private int total;
    // The total number of tickets sold.
    private int sold;

    public void prompt()
    {
        System.out.println("Please insert money for ticket.");
        System.out.println();
    }

    public void showPrice()
    {
        System.out.println("The price of a ticket is " + price + " cents.");
        System.out.println();
    }

    /**
     * Create a machine that issues tickets of the given price.
     * Note that the price must be greater than zero, and there
     * are no checks to ensure this.
     */
    public TicketMachine()
    {
        price = 1000;
        balance = 0;
        total = 0;
    }

    /**
     * Return the price of a ticket.
     */
    public int getPrice()
    {
        return price;
    }

    /**
     * Return the amount of money already inserted for the
     * next ticket.
     */
    public int getAmount()
    {
        return balance;
    }

    public int getTotal()
    {
        return total;
    }

    /**
     * Receive an amount of money in cents from a customer.
     */
    public void insertMoney(int amount)
    {
        balance = balance + amount;
    }

    /**
     * Print a ticket.
     * Update the total collected and
     * reduce the balance to zero.
     */
    public void printTicket()
    {
        // Simulate the printing of a ticket.
        if (balance == price) {
            System.out.println("##################");
            System.out.println("# The BlueJ Line");
            System.out.println("# Ticket");
            System.out.println("# " + price + " cents.");
            System.out.println("##################");
            System.out.println();
            balance = 0;
        } else if (balance < price) {
            System.out.println("Not enough money inserted. Please insert " + (price - balance) + " more cents.");
            System.out.println();
        } else if (balance > price) {
            System.out.println("##################");
            System.out.println("# The BlueJ Line");
            System.out.println("# Ticket");
            System.out.println("# " + price + " cents.");
            System.out.println("##################");
            System.out.println();
            System.out.println((balance - price) + " cents change returned.");
            System.out.println();
            balance = 0;
        }

        // Update the total collected with the balance.
        total = (total + balance) - (balance - price);

    }

    public int ticketsSold()
    {
        // Calculates how many tickets have been sold.
        sold = total / price;
        return sold;
    }

    public void emptyMachine()
    {
        total = 0;
    }

    public void setPrice(int newPrice)
    {
        price = newPrice;
    }

    public void refeundBalance()
    {
        int amountToRefund;
        amountToRefund = balance;
        System.out.println(amountToRefund + " cents refunded.");
        System.out.println();
    }
}