79 lines
2.0 KiB
Java
Executable File
79 lines
2.0 KiB
Java
Executable File
/**
|
|
* 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 Kölling
|
|
* @version 2016.02.29
|
|
*/
|
|
public 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;
|
|
|
|
/**
|
|
* 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(int cost)
|
|
{
|
|
price = cost;
|
|
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 getBalance()
|
|
{
|
|
return balance;
|
|
}
|
|
|
|
/**
|
|
* Receive an amount of money 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.
|
|
System.out.println("##################");
|
|
System.out.println("# The BlueJ Line");
|
|
System.out.println("# Ticket");
|
|
System.out.println("# " + price + " cents.");
|
|
System.out.println("##################");
|
|
System.out.println();
|
|
|
|
// Update the total collected with the balance.
|
|
total = total + balance;
|
|
// Clear the balance.
|
|
balance = 0;
|
|
}
|
|
}
|