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15
Semester 1/Programming 1/Java/examples/projects/chapter02/better-ticket-machine/README.TXT Executable file
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Project: better-ticket-machine
Authors: David Barnes and Michael Kölling
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael Kölling
Pearson Education, 2016
It is discussed in chapter 2.
Purpose of project: To illustrate conditional statements.
How to start this project: Create one or more TicketMachine objects.

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Semester 1/Programming 1/Java/examples/projects/chapter02/better-ticket-machine/TicketMachine.ctxt Executable file
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#BlueJ class context
comment0.params=cost
comment0.target=TicketMachine(int)
comment0.text=\n\ Create\ a\ machine\ that\ issues\ tickets\ of\ the\ given\ price.\n
comment1.params=
comment1.target=int\ getPrice()
comment1.text=\n\ @Return\ The\ price\ of\ a\ ticket.\n
comment2.params=
comment2.target=int\ getBalance()
comment2.text=\n\ Return\ The\ amount\ of\ money\ already\ inserted\ for\ the\n\ next\ ticket.\n
comment3.params=amount
comment3.target=void\ insertMoney(int)
comment3.text=\n\ Receive\ an\ amount\ of\ money\ from\ a\ customer.\n\ Check\ that\ the\ amount\ is\ sensible.\n
comment4.params=
comment4.target=void\ printTicket()
comment4.text=\n\ Print\ a\ ticket\ if\ enough\ money\ has\ been\ inserted,\ and\n\ reduce\ the\ current\ balance\ by\ the\ ticket\ price.\ Print\n\ an\ error\ message\ if\ more\ money\ is\ required.\n
comment5.params=
comment5.target=int\ refundBalance()
comment5.text=\n\ Return\ the\ money\ in\ the\ balance.\n\ The\ balance\ is\ cleared.\n
numComments=6

102
Semester 1/Programming 1/Java/examples/projects/chapter02/better-ticket-machine/TicketMachine.java Executable file
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/**
* TicketMachine models a ticket machine that issues
* flat-fare tickets.
* The price of a ticket is specified via the constructor.
* Instances will check to ensure that a user only enters
* sensible amounts of money, and will only print a ticket
* if enough money has been input.
*
* @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.
*/
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.
* Check that the amount is sensible.
*/
public void insertMoney(int amount)
{
if(amount > 0) {
balance = balance + amount;
}
else {
System.out.println("Use a positive amount rather than: " +
amount);
}
}
/**
* Print a ticket if enough money has been inserted, and
* reduce the current balance by the ticket price. Print
* an error message if more money is required.
*/
public void printTicket()
{
if(balance >= price) {
// 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 price.
total = total + price;
// Reduce the balance by the price.
balance = balance - price;
}
else {
System.out.println("You must insert at least: " +
(price - balance) + " more cents.");
}
}
/**
* Return the money in the balance.
* The balance is cleared.
*/
public int refundBalance()
{
int amountToRefund;
amountToRefund = balance;
balance = 0;
return amountToRefund;
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter02/better-ticket-machine/package.bluej Executable file
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#BlueJ package file
objectbench.height=89
objectbench.width=692
package.editor.height=344
package.editor.width=584
package.editor.x=70
package.editor.y=80
package.numDependencies=0
package.numTargets=1
package.showExtends=true
package.showUses=true
project.charset=UTF-8
readme.editor.height=609
readme.editor.width=798
readme.editor.x=53
readme.editor.y=23
target1.editor.height=661
target1.editor.width=780
target1.editor.x=53
target1.editor.y=34
target1.height=60
target1.name=TicketMachine
target1.naviview.expanded=false
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=120
target1.x=190
target1.y=110

26
Semester 1/Programming 1/Java/examples/projects/chapter02/book-exercise/Book.java Executable file
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/**
* A class that maintains information on a book.
* This might form part of a larger application such
* as a library system, for instance.
*
* @author (Insert your name here.)
* @version (Insert today's date here.)
*/
class Book
{
// The fields.
private String author;
private String title;
/**
* Set the author and title fields when this object
* is constructed.
*/
public Book(String bookAuthor, String bookTitle)
{
author = bookAuthor;
title = bookTitle;
}
// Add the methods here ...
}

17
Semester 1/Programming 1/Java/examples/projects/chapter02/book-exercise/README.TXT Executable file
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Project: book-exercise
Authors: To be set.
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael Kölling
Pearson Education, 2016
It is discussed in chapter 2.
Purpose of project: This project forms the basis of a set of exercises
that can be found in Chapter 2.
How to start this project: Create one or more Book instances.
USER INSTRUCTIONS: Complete the exercises in Chapter 2.

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Semester 1/Programming 1/Java/examples/projects/chapter02/book-exercise/package.bluej Executable file
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#BlueJ package file
objectbench.height=100
objectbench.width=363
package.editor.height=400
package.editor.width=560
package.editor.x=70
package.editor.y=80
package.numDependencies=0
package.numTargets=1
package.showExtends=true
package.showUses=true
project.charset=UTF-8
readme.editor.height=700
readme.editor.width=900
readme.editor.x=53
readme.editor.y=23
target1.editor.height=700
target1.editor.width=900
target1.editor.x=70
target1.editor.y=50
target1.height=60
target1.name=Book
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=110
target1.x=150
target1.y=120

14
Semester 1/Programming 1/Java/examples/projects/chapter02/naive-ticket-machine/README.TXT Executable file
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Project: naive-ticket-machine
Authors: David Barnes and Michael Kölling
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael Kölling
Pearson Education, 2016
It is discussed in chapter 2.
Purpose of project: To illustrate the basics of fields, constructors, and methods.
How to start this project: Create one or more TicketMachine objects.

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Semester 1/Programming 1/Java/examples/projects/chapter02/naive-ticket-machine/TicketMachine.ctxt Executable file
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#BlueJ class context
comment0.params=cost
comment0.target=TicketMachine(int)
comment0.text=\n\ Create\ a\ machine\ that\ issues\ tickets\ of\ the\ given\ price.\n\ Note\ that\ the\ price\ must\ be\ greater\ than\ zero,\ and\ there\n\ are\ no\ checks\ to\ ensure\ this.\n
comment1.params=
comment1.target=int\ getPrice()
comment1.text=\n\ Return\ the\ price\ of\ a\ ticket.\n
comment2.params=
comment2.target=int\ getBalance()
comment2.text=\n\ Return\ the\ amount\ of\ money\ already\ inserted\ for\ the\n\ next\ ticket.\n
comment3.params=amount
comment3.target=void\ insertMoney(int)
comment3.text=\n\ Receive\ an\ amount\ of\ money\ from\ a\ customer.\n
comment4.params=
comment4.target=void\ printTicket()
comment4.text=\n\ Print\ a\ ticket.\n\ Update\ the\ total\ collected\ and\n\ reduce\ the\ balance\ to\ zero.\n
numComments=5

78
Semester 1/Programming 1/Java/examples/projects/chapter02/naive-ticket-machine/TicketMachine.java Executable file
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/**
* 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;
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter02/naive-ticket-machine/package.bluej Executable file
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#BlueJ package file
objectbench.height=89
objectbench.width=706
package.editor.height=327
package.editor.width=598
package.editor.x=70
package.editor.y=80
package.numDependencies=0
package.numTargets=1
package.showExtends=true
package.showUses=true
project.charset=UTF-8
readme.editor.height=611
readme.editor.width=835
readme.editor.x=53
readme.editor.y=23
target1.editor.height=619
target1.editor.width=777
target1.editor.x=69
target1.editor.y=25
target1.height=60
target1.name=TicketMachine
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=120
target1.x=170
target1.y=100