2. Download and open the Nave Ticket Machine project Ive posted -- adapted from the project in Chapter 2 of the BlueJ textbook used in IOOP. a. In the main() method in class SingletonTesting, note added line of code to instantiate a second TicketMachine object with, say, a different price than that in the first, and demonstrate functionality. b. Revise class TicketMachine to make it a Singleton. In the line that creates the initial [single] instance, call the TicketMachine constructor using 500 as the cost of a ticket. c. Try to re-run your demo code that creates a new TicketMachine(...) [wont compile!] d. Comment out the lines in your demo to create a second TicketMachine, and revise the original line to work with the Singleton object and demonstrate functionality. [Hint: In your test driver, youll need to get the instance, not create a new Ticket Machine.]

Deliverables: Zip of TicketMachine project plus your WORD doc with screen shots and results

Heres the code for the 2 java files:

**** TicketMachine: ****

/**

* 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.

*

*

*/

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;

}

}

**** SingletonTesting: ****

public class SingletonTesting

{

public static void main(String[] args)

{

TicketMachine tm1 = new TicketMachine(500);

TicketMachine tm2 = new TicketMachine(200);

System.out.println("Tm1 Price = " + tm1.getPrice());

System.out.println("Tm2 Price = " + tm2.getPrice());

}

}

2. Download and open the Nave Ticket Machine project I've posted -- adapted from the project in Chapter 2 of the BlueJ textbook used in IOOP. a. In the main() method in class SingletonTesting, note added line of code to instantiate a second TicketMachine object with, say, a different price than that in the first, and demonstrate functionality. b. Revise class TicketMachine to make it a Singleton. In the line that creates the initial [single] instance, call the TicketMachine constructor using 500 as the cost of a ticket. c. Try to re-run your demo code that creates a new TicketMachine(...) [won't compile!] d. Comment out the lines in your demo to create a second TicketMachine, and revise the original line to work with the Singleton object - and demonstrate functionality. [Hint: In your test driver, you'll need to get the instance, not create a new Ticket Machine.] Peliverables: Zip of TicketMachine project plus your WORD doc with screen shots and results