Bank Accounts Management System - p. 448
This system provides the basic services to manage bank accounts at a
bank called OOBank. OOBank has many branches, each of which has an
address and branch number. A client opens accounts at a branch. Each
account is uniquely identified by an account number; it has a balance
and a credit or overdraft limit. There are many types of accounts,
including: A mortgage account (which has a property as collateral), a
chequing account, and a credit card account (which has an expiry date
and can have secondary cards attached to it). It is possible to have a joint
account (e.g. for a husband and wife). Each type of account has a
particular interest rate, a monthly fee and a specific set of privileges (e.g.
ability to write cheques, insurance for purchases etc. OOBank is divided
into divisions and subdivisions (such as Planning, Investments and
Consumer), the branches are considered subdivisions of the Consumer
Division. Each division has a manager and a set of other employees.
Each customer is assigned a particular employee as his or her ‘personal
banker’.
© Lethbridge/Laganière 2002
Chapter 5: Modelling with classes - Bank Account
Problem
x1
Marking nouns: potentially good classes, definitely
bad classes, and classes we are unsure about
This system provides the basic services to manage bank accounts at a
bank called OOBank. OOBank has many branches, each of which has an
address and branch number. A client opens accounts at a branch. Each
account is uniquely identified by an account number; it has a balance
and a credit or overdraft limit. There are many types of accounts,
including: A mortgage account (which has a property as collateral), a
chequing account, and a credit card account (which has an expiry date
and can have secondary cards attached to it). It is possible to have a joint
account (e.g. for a husband and wife). Each type of account has a
particular interest rate, a monthly fee and a specific set of privileges (e.g.
ability to write cheques, insurance for purchases etc. OOBank is divided
into divisions and subdivisions (such as Planning, Investments and
Consumer), the branches are considered subdivisions of the Consumer
Division. Each division has a manager and a set of other employees.
Each customer is assigned a particular employee as his or her ‘personal
banker’.
© Lethbridge/Laganière 2002
Chapter 5: Modelling with classes - Bank Account
Problem
x2
Draft Class Diagram with classes Client and
Account, and their association
Client
1..2
acco untHol der
Account
*
acco untNum ber
type
© Lethbridge/Laganière 2002
Chapter 5: Modelling with classes - Bank Account
Problem
x3
Draft Class Diagram with Account attributes
and subclasses
Client
*
1..2
acco untHol der
*
Account
acco untNum ber
op ened Da te
close dDate
in teres tRate
mo nthl yFee
ba lance
creditOrOverdra ftLi mit
ChequingAccount
© Lethbridge/Laganière 2002
MortgageAccount
CreditCardAccount
Chapter 5: Modelling with classes - Bank Account
Problem
x4
Draft Class Diagram with CreditCard and
attributes of Account subclasses
Client
*
1..2
accou ntHold er
*
Account
accou ntNumb er
ope nedDate
cl osed Da te
interestRa te
mon thlyFe e
bal ance
cre ditOrOverdraftLim it
CreditCard
nam e
1..*
ChequingAccount
MortgageAccount
co llateralPro perty
© Lethbridge/Laganière 2002
CreditCardAccount
expiryDate
bran d
Chapter 5: Modelling with classes - Bank Account
Problem
x5
Problem statement - checking off what we have done
(Classes, associations, attributes, generalizations)
This system provides the basic services to manage bank accounts at a
bank called OOBank. OOBank has many branches, each of which has an
address and branch number. A client opens accounts at a branch. Each
account is uniquely identified by an account number; it has a balance
and a credit or overdraft limit. There are many types of accounts,
including: A mortgage account (which has a property as collateral), a
chequing account, and a credit card account (which has an expiry date
and can have secondary cards attached to it). It is possible to have a joint
account (e.g. for a husband and wife). Each type of account has a
particular interest rate, a monthly fee and a specific set of privileges (e.g.
ability to write cheques, insurance for purchases etc. OOBank is divided
into divisions and subdivisions (such as Planning, Investments and
Consumer), the branches are considered subdivisions of the Consumer
Division. Each division has a manager and a set of other employees.
Each customer is assigned a particular employee as his or her ‘personal
banker’.
© Lethbridge/Laganière 2002
Chapter 5: Modelling with classes - Bank Account
Problem
x6
Looking at what we know about Employees
(Classes, associations, attributes, generalizations)
This system provides the basic services to manage bank accounts at a
bank called OOBank. OOBank has many branches, each of which has an
address and branch number. A client opens accounts at a branch. Each
account is uniquely identified by an account number; it has a balance
and a credit or overdraft limit. There are many types of accounts,
including: A mortgage account (which has a property as collateral), a
chequing account, and a credit card account (which has an expiry date
and can have secondary cards attached to it). It is possible to have a joint
account (e.g. for a husband and wife). Each type of account has a
particular interest rate, a monthly fee and a specific set of privileges (e.g.
ability to write cheques, insurance for purchases etc. OOBank is divided
into divisions and subdivisions (such as Planning, Investments and
Consumer), the branches are considered subdivisions of the Consumer
Division. Each division has a manager and a set of other
employees. Each customer is assigned a particular employee
as his or her ‘personal banker’.
© Lethbridge/Laganière 2002
Chapter 5: Modelling with classes - Bank Account
Problem
x7
Draft Class Diagram with Branch and
Employee
Client
Employee
*
pers onal Banker
Branch
*
Account
1..2
accou ntHold er
*
accou ntNumb er
ope nedDate
cl osed Da te
interestRa te
mon thlyFe e
bal ance
cre ditOrOverdraftLim it
CreditCard
nam e
1..*
ChequingAccount
MortgageAccount
co llateralPro perty
© Lethbridge/Laganière 2002
CreditCardAccount
expiryDate
bran d
Chapter 5: Modelling with classes - Bank Account
Problem
x8
Looking at what we know about Branches
(Classes, associations, attributes, generalizations)
This system provides the basic services to manage bank accounts at a
bank called OOBank. OOBank has many branches, each of which has an
address and branch number. A client opens accounts at a branch. Each
account is uniquely identified by an account number; it has a balance
and a credit or overdraft limit. There are many types of accounts,
including: A mortgage account (which has a property as collateral), a
chequing account, and a credit card account (which has an expiry date
and can have secondary cards attached to it). It is possible to have a joint
account (e.g. for a husband and wife). Each type of account has a
particular interest rate, a monthly fee and a specific set of privileges (e.g.
ability to write cheques, insurance for purchases etc. OOBank is divided
into divisions and subdivisions (such as Planning, Investments and
Consumer), the branches are considered subdivisions of the Consumer
Division. Each division has a manager and a set of other employees.
Each customer is assigned a particular employee as his or her ‘personal
banker’.
© Lethbridge/Laganière 2002
Chapter 5: Modelling with classes - Bank Account
Problem
x9
Draft Class Diagram with
OrganizationalUnit
worksFor
su bdivis ion
*
Organiz ationalUnit 0..1
ma nage r
0..1
*
0..1
Employee
Client
*
pe rsona lBanker
Branch
*
Account
1..2
acco untHol der
*
acco untNum ber
op ened Da te
close dDate
in teres tRate
mo nthl yFee
ba lance
creditOrOverdra ftLi mit
CreditCard
na me
1..*
ChequingAccount
MortgageAccount
colla teral Property
© Lethbridge/Laganière 2002
CreditCardAccount
expi ryDate
bra nd
Chapter 5: Modelling with classes - Bank Account
Problem
x10
Problem statement after adding OrganizationalUnit
(Classes, associations, attributes, generalizations)
This system provides the basic services to manage bank accounts at a
bank called OOBank. OOBank has many branches, each of which has an
address and branch number. A client opens accounts at a branch. Each
account is uniquely identified by an account number; it has a balance
and a credit or overdraft limit. There are many types of accounts,
including: A mortgage account (which has a property as collateral), a
chequing account, and a credit card account (which has an expiry date
and can have secondary cards attached to it). It is possible to have a joint
account (e.g. for a husband and wife). Each type of account has a
particular interest rate, a monthly fee and a specific set of privileges (e.g.
ability to write cheques, insurance for purchases etc. OOBank is divided
into divisions and subdivisions (such as Planning, Investments and
Consumer), the branches are considered subdivisions of the Consumer
Division. Each division has a manager and a set of other employees.
Each customer is assigned a particular employee as his or her ‘personal
banker’.
© Lethbridge/Laganière 2002
Chapter 5: Modelling with classes - Bank Account
Problem
x11
Thinking about how to deal with privileges
(Classes, associations, attributes, generalizations)
This system provides the basic services to manage bank accounts at a
bank called OOBank. OOBank has many branches, each of which has an
address and branch number. A client opens accounts at a branch. Each
account is uniquely identified by an account number; it has a balance
and a credit or overdraft limit. There are many types of accounts,
including: A mortgage account (which has a property as collateral), a
chequing account, and a credit card account (which has an expiry date
and can have secondary cards attached to it). It is possible to have a joint
account (e.g. for a husband and wife). Each type of account has a
particular interest rate, a monthly fee and a specific set of privileges (e.g.
ability to write cheques, insurance for purchases etc. OOBank is divided
into divisions and subdivisions (such as Planning, Investments and
Consumer), the branches are considered subdivisions of the Consumer
Division. Each division has a manager and a set of other employees.
Each customer is assigned a particular employee as his or her ‘personal
banker’.
© Lethbridge/Laganière 2002
Chapter 5: Modelling with classes - Bank Account
Problem
x12
Draft Class Diagram
with AccountType
works For
sub divisi on
*
OrganizationalUnit 0..1
man ager
0..1
Employee
AccountType
Client
*
interestRa te
mon thlyFe e
ch ecksAl lowed
ins uranceAvai labl e
Branch
*
0..1
pers onal Banker
1..2
accou ntHold er
*
*
Account
*
accou ntNumb er
ope nedDate
cl osed Da te
interestRa te
mon thlyFe e
bal ance
cre ditOrOverdraftLim it
CreditCard
nam e
1..*
ChequingAccount
MortgageAccount
co llateralPro perty
© Lethbridge/Laganière 2002
CreditCardAccount
expiryDate
bran d
Chapter 5: Modelling with classes - Bank Account
Problem
x13
Bank Account System Class diagram with
final touches
works For
Person
sub divisi on
*
nam e
OrganizationalUnit 0..1
man ager
0..1
Employee
AccountType
add ress
num ber
Client
*
interestRa te
mon thlyFe e
ch ecksAl lowed
ins uranceAvai labl e
peri odicFee
peri od
Branch
*
0..1
pers onal Banker
1..2
accou ntHold er
*
*
Account
*
accou ntNumb er
ope nedDate
cl osed Da te
interestRa te
mon thlyFe e
bal ance
cre ditOrOverdraftLim it
CreditCard
nam e
1..*
ChequingAccount
MortgageAccount
co llateralPro perty
© Lethbridge/Laganière 2002
CreditCardAccount
expiryDate
bran d
Chapter 5: Modelling with classes - Bank Account
Problem
x14