Object-oriented analysis

A product is to be install control software for ATM. The problem concerns the financial transaction to the following constraints.

C1: Each card has PIN. If the PIN is incorret then card reject.

C2: Deposit. Print report showing the date, amount depositted, and account number

C3: Withdraw up to $200 in units of $20 and account may not be overdrawn. Print report showing the date, amount withdraw, account number, and account balance.

C4: Determine account balance. On sreen display

C5: Transfer funds between accounts. The transfering account can not be overdraw. Print report showing the date, amount transfer, and two account number

C6: Card reject if PIN number is incorrect or quit

 

1.Class modeling

Stage 1: Concise Problem Definition

The ATM controlled withdraw, deposite, account balance and transfer funds. To access the account. user have to enter correct PIN number. Quit to terminated the transaction.

Stage 2: Informal Strategy

The ATM controlled withdraw, deposite, account balance and transfer funds. To access the account. user have to enter correct PIN number. Quit to terminated the transaction. Print report for any financial transaction and reject card in case of incorrect PIN number, quit or completion on the transaction.

Stage 3: Formalize the strategy

The Atm controlled withdraw, deposite, account balance and transfer funds. To access the account. user have to enter correct PIN number. Quit to terminated the transaction. Print report for any financial transaction and reject card in case of incorrect PIN number, quit or completion on the transaction.

There are three class as ATM class, Transaction class, and Report class. The problem specified four operation of financial transaction so that their four method of transaction class as Withdraw, Deposite, Balance, and Transfer class. The report also contents four method as descriped above.

2.Dynamic modeling

Dynamic model for ATM class is shown as below

Dynamic model for Transaction class is shown as below

Dynamic model for Printer class is shown as below

3. Functional modeling

Object-oriented design

1. Determine the actions of the class

2. Design the product in terms of clients of objects is shown as below

 

3. Proceed to the detailed design

 

Class Name	Printer
Method Name	PrintWithdraw
Modifier, Type	public void
Agrument	Account data structure, Date
Error message	Printer Error
Files access	none
Files changed	none
Method called	none
Narrative	Print withdraw slip

 

Class Name	Printer
Method Name	PrintDeposite
Modifier, Type	public void
Agrument	Account data structure, Date
Error message	Printer Error
Files access	none
Files changed	none
Method called	none
Narrative	Print deposite slip

Class Name	Printer
Method Name	PrintTransfer
Modifier, Type	public void
Agrument	Account data structure, Date
Error message	Printer Error
Files access	none
Files changed	none
Method called	none
Narrative	Print transfer funds slip

Class Name	Transaction
Method Name	Withdraw
Modifier, Type	public boolean
Agrument	Account data structure
Error message	Error if overdrawn
Files access	user's account
Files changed	user's account
Method called	none
Narrative	performs withdraw from user's account

Class Name	Transaction
Method Name	Deposite
Modifier, Type	public boolean
Agrument	Account data structure
Error message	error if update can not exist
Files access	user's account
Files changed	user's account
Method called	none
Narrative	performs update ba;lance in user's account

Class Name	Transaction
Method Name	Balance
Modifier, Type	public boolean
Agrument	Account data structure
Error message	error in case of can not get user's account
Files access	user's account
Files changed	none
Method called	none
Narrative	Show user's account balance on monitor

Class Name	Transaction
Method Name	Transfer
Modifier, Type	public boolean
Agrument	Account data structure of user, Account data structure of transfer account
Error message	error in case of failed transaction
Files access	user's account and transfered's account
Files changed	user's account and transfered's account
Method called	none
Narrative	performs transfer funds between two accounts

Class Name	ATM
Method Name	GetPIN
Modifier, Type	public String
Agrument	none
Error message	error if null string
Files access	none
Files changed	none
Method called	none
Narrative	get PIN number from keypad

Class Name	ATM
Method Name	VerifyPIN
Modifier, Type	public booleam
Agrument	user's pin as string
Error message	error if no card in slot
Files access	none
Files changed	none
Method called	none
Narrative	verify PIN number on card and user's enter on keypad

Class Name	ATM
Method Name	Quit
Modifier, Type	public void
Agrument	none
Error message	error if card in slot
Files access	none
Files changed	none
Method called	none
Narrative	eject card from slot

Remark: main function sitted in ATM class wich call instantaneous of transaction class if PIN number are correct. In case of incorrect PIN , the software call quit method to eject card.