Understanding class definitions - Objects First with Java: A Practical Introduction Using BlueJ - page 21

Code 2.1
continued
The TicketMachine
class

* @author David J. Barnes and Michael Kölling
* @version 2011.07.31
*/
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;

}