Object-Oriented Software
Engineering:
Using UML, Patterns and Java, 3rd
Edition
Bernd Bruegge, Allen Dutoit
Exercise: Modeling with UML
Modeling with UML
1) Model an ATM
Draw a use case diagram for an ATM (cash terminal). The system includes two
actors: a customer, who draws money from his account either on the money
chip on his bank card or in cash, and a security man, who fills money into the
ATM.
Use cases should include: DrawCash, LoadMoneyChip, CheckAccountBallance, FillATM. Also
include the following exceptional cases: OutOfMoney, TransactionAborted (i.e.,
customer selected the cancel button without completing the transaction) and
MoneyChipOutOfOrder.
Remark: It is possible to use inheritance between use cases!
Write the flow of events and specify all fields for the use case CheckAccountBalance
that you drew before. Specify relationships.
Solution:
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Object-Oriented Software
Engineering:
Using UML, Patterns and Java, 3rd
Edition
Bernd Bruegge, Allen Dutoit
Exercise: Modeling with UML
Use case name CheckAccountBalance
Participating Actors Initiated by Customer
Flow of events 1. The Customer inserts his bank card into the
ATM.
2. The ATM welcomes the Customer
and opens the main menu.
3. The ATM waits for the selection from
the Customer.
4. The Customer selects the
“CheckAccountBalance” function by pressing the
appropriate button.
5. The ATM system shows the enter
PIN screen to the Customer.
7. The Customer enters his correct PIN and
confirms it.
5. The ATM system shows the actual
balance of the Customer’s account.
Entry condition The ATM is working and Customer is in front of
the terminal.
Exit condition The Customer can view his account balance.
Quality The ATM stays online for the whole period of the
requirements CheckAccountBalance use case.
Figure 1
2) Model a book
Draw a class diagram representing a book defined by the following statement:
“A book is composed of a number of parts, which in turn are composed of a
number of chapters. Chapters are composed of sections.” First, focus only on
classes and associations.
Add multiplicity to the class diagram you produced.
Refine the class diagram to include the following attributes:
Book includes a publisher, publication date, and an ISBN
Part includes a title and a number
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Object-Oriented Software
Engineering:
Using UML, Patterns and Java, 3rd
Edition
Bernd Bruegge, Allen Dutoit
Exercise: Modeling with UML
Chapter includes a title, a number, and an abstract
Section includes a title and a number
Consider the refined class diagram. Note that the Part, Chapter, and Section
classes all include a title and a number attribute. Use inheritance to factor out
these two attributes .
Solution:
1.)
Book
1
*
Part
1
*
Chapter
1
*
Section
2.)
3.)
3/7
Object-Oriented Software
Engineering:
Using UML, Patterns and Java, 3rd
Edition
Bernd Bruegge, Allen Dutoit
Exercise: Modeling with UML
3) Happy Hour Message
Draw a sequence diagram for the HappyHourMessage scenario in the figure below.
Draw only the first five messages exchanged.
Solution:
Scenario name HappyHourMessage
Participating actor bob, alice: BarFlies
john: Friend
instances
Flow of events 1. Bob and Alice are sitting in their favorite
pub and it’s happy hour.
They want to invite their common friend
John who likes cocktails and didn’t know
about the newly scheduled happy hour.
Alice takes out her “mobile phone” and
activates the “SMS” function.
2. Alice enters John’s cell phone number and
writes the message about the happy hour
into the “SMS text field”. She sends the
message and waits for John’s answer.
3. John, who is still at work, is alerted by a
sound of his cell phone that a new “SMS”
has arrived. He reads the lines from Alice
and answers that he will come
immediately. He quits working and leaves
the office.
4. Alice receives John’s answer at her
“mobile phone”.
Figure 2
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Object-Oriented Software
Engineering:
Using UML, Patterns and Java, 3rd
Edition
Bernd Bruegge, Allen Dutoit
Exercise: Modeling with UML
Solution:
4) Model an online bookstore
Consider the process of ordering a book via Internet. Draw an activity diagram
representing each step of the process, from the moment you open the shop’s
web page to the point when you start reading the book, including login or
registration. Include activities that others need to perform.
Add additional exception handling to the activity diagram you have
developed. Model the following three exceptions:
1. The order got lost in the Internet
2. The wrong book is packaged
3. The ordered book is no longer available
Solution:
5/7
Object-Oriented Software
Engineering:
Using UML, Patterns and Java, 3rd
Edition
Bernd Bruegge, Allen Dutoit
Exercise: Modeling with UML
6/7
Object-Oriented Software
Engineering:
Using UML, Patterns and Java, 3rd
Edition
Bernd Bruegge, Allen Dutoit
Exercise: Modeling with UML
7/7
