OOSE Unit-4 Super Fast Revision (Memory Tricks)

 

OOSE Unit-4 Super Fast Revision (Memory Tricks)

1. Object Oriented Design (OOD)

Remember Formula

OOD = Analysis → Design

OO Design converts requirements into classes, objects, and relationships.

Objectives Trick

CRARMQ

  • C = Classes
  • R = Relationships
  • A = Architecture
  • R = Reusability
  • M = Maintenance
  • Q = Quality

👉 OOD improves Reusability + Maintenance + Quality.

2. Conventional vs OO Design

Remember

Old = Functions

New = Objects

ConventionalOO Design
FunctionObject
DFDUML
Low ReuseHigh Reuse
Hard MaintenanceEasy Maintenance

Exam One Liner

OO Design combines Data + Functions.

Conventional Design keeps them separate.

3. CRC Cards

CRC Means

C = Class

R = Responsibility

C = Collaborator

Memory Trick

👉 WHO + WORK + HELPER

ClassResponsibilityCollaborator
StudentRegisterCourse

Remember

Class = Who

Responsibility = Work

Collaborator = Helper

4. Class Diagram

Formula

Class Diagram =

Class Name +
Attributes +
Methods +
Relationships

Example

Student

  • RollNo
  • Name

Methods:

  • Register()
  • Display()

Memory Trick

Class Diagram = Blueprint of Software

5. Interaction Diagram

Purpose

Shows communication between objects.

Types

Remember:

SC

  • S = Sequence Diagram
  • C = Collaboration Diagram

Sequence Example

Student
↓
Login Page
↓
Database
↓
Result

Memory Trick

Interaction Diagram = Object Conversation

6. State Chart Diagram

Formula

State → Transition → State

ATM Example

Idle
↓
Insert Card
↓
PIN
↓
Transaction
↓
Eject Card

Memory Trick

State Chart = Life Cycle of Object

7. Component Diagram

Remember

Shows Software Parts

Example:

UI
↓
Business Logic
↓
Database

Memory Trick

Component Diagram = Software Architecture View

8. Deployment Diagram

Remember

Shows Hardware Placement

Example:

Client PC
↓
Application Server
↓
Database Server

Memory Trick

Component = Software

Deployment = Hardware

🔥 Very Important Difference

Component Diagram → Software Structure

Deployment Diagram → Hardware Structure

9. ATM Case Study

Main Classes

CAAT

  • Customer
  • ATM
  • Account
  • Transaction

Functions

Insert Card

PIN

Balance Check

Withdraw

Deposit

Transfer

Receipt

Memory Trick

ATM = Money Operations

10. Payroll System

Main Classes

EPSD

  • Employee
  • Payroll
  • Salary
  • Department

Functions

Registration

Attendance

Salary Calculation

Tax Deduction

Report Generation

Salary Slip

Memory Trick

Payroll = Employee Salary System

11. Course Registration System

Main Classes

SCRF

  • Student
  • Course
  • Registration
  • Faculty

Functions

Login

Course Selection

Registration

Fee Payment

View Result

Memory Trick

Course Registration = Student + Course Management

30-Second Revision

OOD

➡ Analysis → Design

CRC

➡ Class + Responsibility + Collaborator

Class Diagram

➡ Class + Attributes + Methods

Interaction Diagram

➡ Sequence + Collaboration

State Chart

➡ Object Life Cycle

Component Diagram

➡ Software Structure

Deployment Diagram

➡ Hardware Structure

ATM

➡ Customer + ATM + Account + Transaction

Payroll

➡ Employee + Salary

Course Registration

➡ Student + Course + Registration + Faculty

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