Practical No 9

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 Practical No 9 :Draw class diagram sequence diagram state transition diagram for assign project.

Class diagram is a static diagram. It represents the static view of an application. Class diagram is not only used for visualizing, describing, and documenting different aspects of a system but also for constructing executable code of the software application.

Class diagram describes the attributes and operations of a class and also the constraints imposed on the system.Class diagram shows a collection of classes, interfaces, associations, collaborations, and constraints. It is also known as a structural diagram.

Purpose of Class Diagrams

The purpose of class diagram is to model the static view of an application. Class diagrams are the only diagrams which can be directly mapped with object-oriented languages and thus widely used at the time of construction.


Sequence Diagram

Sequence diagrams show an overview of the interactions between objects in a system over time. Also called event diagrams or event scenarios, sequence diagrams depict the sequential events that occur and the processes that are completed.

Each object has a vertical lifeline descending from it to show the different processes that exist simultaneously in the system during the time period captured by the diagram.

The interactions between them are represented by horizontal arrows that can go from left to right and vice versa. These arrows actually depict messages in the system and the style of arrow tells you whether the messages are synchronous, asynchronous, or whether the message creates or deletes objects in the system. The arrows descend in the order in which the events they represent occur.





State Transition Diagram 

State Transition Diagram are also known as Dynamic models. As the name suggests, it is a type of diagram that is used to represent different transition (changing) states of a System. It is generally used to graphically represent all possible transition states a system can have and model such systems. It is very essential and important and right for object-oriented modeling from the beginning.

    The System consists of various states that are being represented using various symbols in the state transition diagram. You can see the symbols and their description given below :

    1. Initial State –

    2.Final State -


    3.Simple State –


    4.Composite State –





    Result: Hence we have drawn class diagram sequence diagram and state transition diagram for bank management system.


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