Chapter 2, Problem 1E

Create a TicketMachine object on the object bench and take a look at its methods. You should see the following: getBalance, getPrice, insertMoney, and printTicket. Try out the getPrice method. You should see a return value containing the price of the tickets that was set when this object was created. Use the insertMoney method to simulate inserting an amount of money into the machine. The machine stores as a balance the amount of money inserted. Use getBalance to check that the machine has kept an accurate record of the amount just inserted. You can insert several separate amounts of money into the machine, just like you might insert multiple coins or bills into a real machine. Try inserting the exact amount required for a ticket, and use getBalance to ensure that the balance Is Increased correctly. As this is a simple machine, a ticket will not be issued automatically, so once you have inserted enough money, call the printTicket method. A facsimile ticket should be printed in the BlueJ terminal window.

Program Plan Intro

Creating a TicketMachine object and using functions of the object class.

Program Plan:

Write a JAVA program to create an object of the class TicketMachine with the main function and the required set of statements to accomplish the following:

Use of the getPrice method to check the return value containing the price of a ticket

Use of insertMoney to inserting money into the machine

Check the balance using getBalance method to keep an accurate record of the money.

Generate a ticket using printTicket method when inserted enough money.

Program Description Answer

Program Description:

The following JAVA program prompts the user to insert enough money to a TicketMachine before trying to print a ticket.

Explanation of Solution

Program:

// TicketMachine is a working model of the ticket printing machine.

// Through constructor, the price of the ticket is passed.

// For printing tickets, enough money has to be entered into the machine.

class TicketMachine

{

// Cost per ticket.

private int price;

// Customer entered amount.

private int balance;

// The amount present in the machine.

private int total;

// Constructor to take and initialized the price of the ticket.

public TicketMachine(int cost)

{

// Cost of ticket allocated.

price = cost;

//declaring the value of variable

balance =0;

//declaring the value of variable

total = 0;

}

// Gets the ticket price

public int getPrice()

{

//return the value of price

return price;

}

// declaring the nee method .

public int getBalance()

{

//return the value of balance.

return balance;

}

// decaling method for money

public void insertMoney(int amount)

{

//add the balance

balance = balance + amount;

}

//Ticket has to be printed.

// Update the total money present in the machine and change the balance for // next ticket to zero.

public void printTicket()

{

//message for printing of a ticket.

System.out.println(“###################�);

//message for printing of a ticket.

System.out.println(“# The Bluej line�);

//message for printing of a ticket.

System.out.println(“# Ticket�);

//message for printing of a ticket.

System.out.println(“# “+ price + “ cents.�);

//message for printing of a ticket.

System.out.println(“###################�);

//message for printing of a ticket.

System.out.println();

// Total money is update for the machine.

total = total + balance;

// balance is cleared for the next ticket.

balance = 0;

}

}

/&

The main class which has the main method to create and

call the object of the TicketMachine.

*/

public class Main

{

// Main method to call the methods

public static void main(String[] args) {

/**

Creating object 'obj' of class TicketMachine.

and the cost of the ticket = 1000.

*/

TicketMachine obj = new TicketMachine(1000);

// To see the price of the ticket

System.out.println("The price of the ticket = " + obj.getPrice());

// Inserting amount into the TicketMachine.

obj.insertMoney(1000);

// Checking for the balance in the TicketMachine.

System.out.println("Balance = " + obj.getBalance());

/&

Balance should be enough to print the ticket

Assuming that cost of ticket is 1000.

*/

if(obj.getBalance()>=1000)

{

// Print the ticket

obj.printTicket();

}

// Checking the balance is increasing on inserting more money .

obj.insertMoney(100);

System.out.println("New Balance = " + obj.getBalance());

}

}

Sample Output