UML - ATM Transaction - Class Diagram

class diagram on ATM transaction case

study so in the previous videos we have

discussed what is the problem statement

what are the functional and

non-functional requirements how to draw

the useless diagram what are the do's

and don'ts to be followed up when

drawing the use case diagram in this

particular video we are going to discuss

what is the class diagram for this

respective problem so a class is

something that encapsulate s--

information and the barrier behavior

means the operations the stock the top

section of the class holds the class

name and optionally it is stereotype the

middle section holds the attributes of

the information that a class is holding

the lower section that means this

particular part holds the operations or

the behavior of a class so that means

these operations are on the attributes

which will be in this second section the

lower section holds the operations or

the behavior of a class we can also show

the visibility of each attribute and

operation data type of each attribute

and the signature of each operation on

these diagrams so what are the

visibility just see here whenever we are

having these attributes they'll be

coming with this icons whenever you are

having the methods or the operations

they'll be coming with this icon with a

magenta color and here you see whenever

you are having something public

visibility the member variable or the

attribute with the public visibility

nothing will come here in case a private

this lock will be coming here in case of

protected this key will be coming here

in case of package this hammer will be

coming there so these are the symbols

you will be getting if you work with

this rational rows software so I have

taken this one from the rational rows of

the screenshot so in case of metals in

case of operations this icons will be

coming for all of them and they will be

written or they will be included in the

third section of this rectangular box

there is a class and here we are having

for the public

no icon will be there for private lock

for protected we're having key and for

package we'll be having this hammer

symbol and this is our class name and

here the class name must be purposeful

from the very class name that

nomenclature should be done in such a

way that we can get the idea what is the

purpose of the class so here is the

class diagram which we are suggesting

for this ATM transaction case study so

here we are having this card reader

having one attribute and we are having

this set of methods and operations to be

carried out there is a accept card eject

card and read card so these are the

methods were having this is the

attribute and these are respective class

name so here you can also mention not

only the card number but card number :

in de jure so the respective data type

cannot be also mentioned here this is a

ATM screen this is our cash dispenser

and here we are having this cash balance

and this two methods are there one is

the provide cash another one is a

provide received so here we are having

this account class and we're having this

account number pin balance and these are

the respective operations which can be

carried out on them there is open read

griffons withdraw funds deduct funds and

verify funds so these are the respective

menthols and operations were having we

know that in our class diagram also we

have discussed that one that these

classes can be divided into two

different categories one is your

transient class another one is your

persistent class so if you click if you

go if you select this one and go for

right click on rational rules it will be

getting their respective property the

window will come and there you can

select the radio buttons are there they

will can select either transient or part

system whenever you are selecting one

class has a persistent class then the

respective DDL can be generated from the

software and if you run the DDL then

that on the database the respective

tables will get created with these

respective attributes so the respective

create query create table table name so

in this way that create queries that DDL

will get generated in a certain script

so these facilities are available in

a proper UML tool so let us go for one

practical demonstration to show you that

how this class diagrams can be drawn and

what are the other features of the

software using rational rules so here is

the demonstration for you in this class

we shall show you how to draw the class

diagram using rational rule software so

at first we shall go for the logical

view and if you double click on this men

this window will pop up now here we are

having this respective toolbar

containing so many different tools

required for the class diagram so here

we are having this tool that is a class

so I'm selecting here I am giving the

name as class 1 reading another class

here as class 2

creating another class here as class

three okay so here we are having three

classes we have created red button click

while going for this new attribute so

here the syntax is name : type is equal

to initial value so going for this VAR 1

1 : integer in this way I am going to

create another 2

you

okay so these are the variables we have

created here now if we go for the open

specification then if you go for the

attributes here we are having the list

of attributes whatever we have created

so now these are the attributes we are

having here and this attribute data type

can be changed from this drop-down list

so I think you are getting me that how

we have changed how we can change the

attribute data type here so I can go for

this long type and go for apply then ok

so now it has got changed in this way so

you can double click here when you can

change this one and you can make this

one as protected if you go for apply

then these are symbol of the protected

so if you go for the public go for apply

it will be of the type public and then

if you go for the private if you go for

apply then it is coming with a lock so

in case of public there will be no key

no lock you can find it here in cursor

protected it will be coming with the key

here and in case of private it will be

coming with this lock here okay so in

this way we are having this list of

variables with the different scopes and

the data types can be changed from here

also the data that can be changed from

here also okay now we have done it now

whenever will be creating such classes

it is having mainly three sections so

one is that containing the class name

next one is the list of attributes and

then last one will be the corresponding

methods to be inserted so here we can go

for the new operation to insert this

method but I want to show you something

different here let us go for the

sequence diagram here so if you if want

initiate sequence diagram you are

supposed to click here and then go for

the logical view go for okay give a new

name say new sequence diagram one moving

for okay so now we have we have created

this sequence diagram here so now when

this particular sequence diagram is

being selected so here this respective

toolbar will be coming and the class

will be selected the another toolbar

will be coming here so now I am going

for this now going for the right button

click open specification

so I'm selecting this class as class 1

giving the name as object 1 going for

apply and ok so this is a sequence

diagram and here we are having this OB 1

colon class 1 so this is object name it

is the class name here we are having

this so now let me go for the another

insertion of another class here going

for open specification

no see until this whatever you have done

if you go for this compilation if you go

for this check model you see that is no

a that is coming there is no error you

can also come to this check model you

can find that that is no error here

there is no either one of the classes

have got created and it is our check

model is working fine okay

no see here from here to here we are

going for one sequence flow and giving

the sliminess function one function one

to function want to go for a plane okay

so so that is my function one two here

now if you go for the check model if you

go for check model it will show some

error message we can also find this

error message here so this error message

it is showing unresolved reference to

operation with named function one two in

message function one two between OB one

and OB two in the sequence diagram new

sequence diagram one so that is the

error message it is giving now remember

whenever you are having such function

which is which is against this

particular directed line unit direct

line from class 1 to class 2 then this

function must be the member function for

this class - let me show you this one so

win for this new operation and here we

are going for this function 1 2 so this

is a function we are having so now we

can this a public one so this is a class

2 type class and this is my detailing if

you go for the detailing we are having

this one so now if you go for the

respective attributes and operations so

here you see this operation we are

having so now go for ok so operation

means here the method so now if you go

for the check model you can find that

there is no error there is no error only

the check model is being written here so

that is no error so now if I go for

another unit Direction line from here to

here and if you give this name as

function to one in that case and go for

applying ok

so now if I go for this check model once

again

there is some error you can find this

error coming so due to the function to

one between the object one and object to

so what we shall do as this particular

unidirectional this line is is directed

towards this class one OB one so that's

why in class one we should include that

operation so it shall go for function

two one now if I go for this and if I go

for this this check model you can find

that there is no air that is coming

there is no error is coming so

arbitrarily we cannot put these

functions arbitrary we should not put

these functions and also these functions

are quite correlated with this sequence

diagram and what about the functions we

are mentioning they are to be placed in

the respective class as the methods

so all this class diagrams sequence

diagram all these things are highly

related so here we can only have the

object name or the class name or object

name : class name that means until and

unless these classes are getting created

we cannot make them as a heading for

this sequence diagram so I think you

were getting my issue that how this

codes are getting created so now if I if

I include another function here

so function two one two I'm going for

the other one so now if I go for the if

I select this one go for the double

click and if you go for this detail and

if you select this persistent now what

is the difference between persistent

class and transient class in case a

persistent class we are expecting that

will be one table which will be formed

against this particular class in the

underneath layer of database so that can

also be done here the schema can also be

produced from this rational rows just

select this one and Pryor going there

you should make this one confirm that

you have made this one persistent and

then you go for these tools DDL that is

a data definition language generate code

select the respective database here this

is a respective file which will be

created containing create table class

one and then we are having this VAR one

one of the type long word one two of the

type integer

so the respective conversions of data

types will take place depending upon the

target database and in this way the

database will get created at the

respective schema definition will be

written in this DD L 1 dot SQL script so

later going to the oracle environment we

can run this script and all the schemas

will get will get created at one shot so

in this way you see the detail

generation has got completed so DDL one

toward SQL file will get generated

accordingly so in this way the

respective class diagram and the

sequence diagrams are related so let me

come to the sequence diagram once again

so now if you select this one and if you

go for double-click and here we are

having the detailing so you can make

this one synchronous you can make this

one synchronous if you go for apply and

then you can find that it is the

respective symbol has come and here also

if you make this one as timeout say so

all these options are there simple

synchronous bulking timeout and as

synchronous so if you go for apply and

then if you go for this respective

refresh so

you are getting this particular time of

notation has come so we got we can also

have this one we can also go for this so

there is a self-loop we can do and here

you can write some descriptions so

sequence diagrams and class diagrams how

can we draw them in our rational rule

software that has been depicted in this

demonstration