Online Complaint Management System - Java

A console-based complaint management system built using Java and Object-Oriented Programming principles.

The application allows users to register, login, and submit complaints with different categories and priorities. The project follows a layered architecture similar to real-world enterprise applications.

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Features

User Features

• User registration
• User login authentication
• Create complaints
• Generate unique complaint IDs
• View user complaints
• Input validation

Complaint Management

• Complaint categories:

  • Technical
  • Billing
  • Service
  • Product
  • Infrastructure
  • Other

• Complaint priorities:

  • Critical
  • High
  • Medium
  • Low

Architecture Features

• Object-Oriented Programming
• Repository Pattern
• Service Layer Pattern
• Model Driven Design
• Enum-based status management
• Modular package structure

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Project Architecture

src/

├── main/

│ └── Main.java

├── model/

│ ├── User.java

│ ├── Complaint.java

│ ├── Role.java

│ ├── ComplaintCategory.java

│ ├── ComplaintPriority.java

│ └── ComplaintStatus.java

├── repository/

│ ├── UserRepository.java

│ └── ComplaintRepository.java

├── service/

│ ├── UserService.java

│ └── ComplaintService.java

└── utility/

├── IdGenerator.java

├── ValidationUtil.java

└── FileManager.java

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Technologies Used

• Java
• Object-Oriented Programming
• Collections Framework
• Exception Handling
• Java Enums
• Layered Architecture

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Application Workflow

User Registration

↓

User Login

↓

Create Complaint

↓

Assign Category

↓

Select Priority

↓

Generate Complaint ID

↓

Track Complaint Status

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Sample Output

Complaint Created Successfully

Complaint ID : CMP1002

User ID : 1001

Title : Projector is Not Working

Description : Projector in classroom is not switching on

Category : INFRASTRUCTURE

Priority : HIGH

Status : OPEN

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Screenshots

Application Main Menu

Shows the starting menu where users can register, login, or exit.

User Registration

User creates an account with name, email, and password.

User Login

Authentication flow for registered users.

Creating Complaint

User submits a complaint by entering title, description, category, and priority.

Complaint Generated Successfully

System generates a unique complaint ID and displays complaint details.

Project Structure

Layered architecture containing model, repository, service, and utility packages.

How To Run

Clone repository:

git clone https://github.com/vyawaha/online-complaint-management-system-java.git

Compile:

javac -cp src src/model/.java src/repository/.java src/utility/.java src/service/.java

Compile Main:

javac -cp src src/main/Main.java

Run:

java -cp src main.Main

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Future Improvements

• Database integration using MySQL
• File-based persistence
• Complete Admin dashboard
• Complaint search and filtering
• REST API using Spring Boot
• Web-based frontend

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Learning Outcomes

Through this project I practiced:

• Java OOP concepts
• Software architecture design
• Repository and service patterns
• Clean code organization
• Building console-based enterprise applications

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Author

Muktai Vyawahare

Computer Science Engineering Student