ATM System Class and Sequence Diagrams

This document presents a solution for an ATM system design, focusing on class and sequence diagrams. The class diagram outlines the structure of the system, including classes like Account, AccountData, and ATMState, along with their attributes and operations. The sequence diagram illustrates the interaction between objects for a specific sequence of operations: OPEN, LOGIN, PIN, DEPOSIT, BALANCE, suspend, and close. The solution provides a detailed look at how the system transitions between states and manages account data.

Contents
Centralized.......................................................................................................................................1
Class Diagram..............................................................................................................................1
Sequence Diagram...........................................................................................................................6

Centralized
Class Diagram

Class Account:
S// point to current state
LS[0] // point to start state
LS[1] // point to idle state
LS[2] // point to ready state
Operations:
create(){
S->create()
currState = S.getID()
IF currState == 0 THEN
S = LS[1] //change ATM state from “Start” to “Idle”
ENDIF
}
Open(int p, int y, int a){
S->open(p,y,a);
currState = S.getID()
If(currState == 1) then
AccountData ad = new AccountData(p,y,a,”active”);
End if
}
Pin(int p){
S->pin(p)
currState = S.getID()
IF( currState = 1 && p == ad.getPint())
Set S = LS[2];
END IF
}

Deposit(int d){
S->deposit(d);
currState = S.getID()
IF(currState = 2 )
Ad.deposit(d);
End IF
}
Withdraw(int y){
S->withdraw(y);
currState = S.getID()
IF(currState = 2 )
Ad.withdraw(y);
End IF
}

Balance(){
S->balance()
currState = S.getID()
IF(currState = 2 ) THEN
Return ad.balance();
END IF
}
Logout(){
S->logout()
currState = S.getID()
IF(currState = 2 ) THEN
S = LS[1];
End IF
}
Suspend(){
S->suspend()
currState = S.getID()
IF(currState = 2 ) THEN
Ad.setAccountStatus(“suspend”);
End IF
}

activated(){
S->activated()
currState = S.getID()
IF(currState = 2 ) THEN
Ad.setAccountStatus(“activated”);
End IF
}
Close(){
S->close()
currState = S.getID()
IF(currState = 2 ) THEN
S = LS[1];
End IF
}
Class AccountData:
setPin(int pincode){
pin = pincode
}
Deposit(int d){

Balance = balance + d
}
withdraw(int w){
Balance = balance - w;
}
Balance(){
Return balance;
}
setAccountStatus(String status){
accountStatus = status;
}
Class “ATMState”
getID(){
Return ID;
}
Class “Start”
ID = 0
Create(){
// no action defined
}
Class “Idle”

ID = 1
pin(int p){
Ad.setPint(p);
}
open(int p,int y,int a){
ad.setPin(p)
ad.setIdentification(y)
ad.setBalance(a)
}
login(int y){
ad.setsetIdentification(y)
}
Class “Ready”
ID = 3
deposit(int d){
Ad.setBalance(ad.getBalace() + d)
}
withdraw(int w){
ad.setBalance(ad.getBalance() – w)
}
balance(){
// display ad.getBalance()
}
close(){
// eject card
}

Sequence Diagram
Provide a sequence diagram for the following operation sequence:
OPEN(123,111,1000), LOGIN(111), PIN(123), DEPOSIT(200), BALANCE(),
suspend(), close.