🛠️ Online Complaint Management System using Java

A console-based Online Complaint Management System developed using Core Java, Object-Oriented Programming (OOP), Collections Framework, and File Handling. This project allows users to register, submit complaints, track complaint status, and provide feedback, while administrators can manage and resolve complaints efficiently.

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📌 Project Overview

The Online Complaint Management System is designed to simplify complaint handling through a role-based console application. It demonstrates Java programming concepts and follows a modular project structure suitable for academic learning and GitHub portfolio projects.

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✨ Features

👤 User Module

• User Registration
• Secure Login
• Submit New Complaint
• Auto Complaint ID Generation
• View Complaint History
• Track Complaint Status
• Submit Feedback & Rating
• Logout

👨‍💼 Admin Module

• Admin Login
• View All Complaints
• Search Complaint by ID
• Search Complaints by Category
• Search Complaints by Status
• Update Complaint Status
• Complaint Statistics Dashboard
• Logout

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🔄 Project Workflow

User Registration/Login
          │
          ▼
Complaint Submission
          │
          ▼
Complaint ID Generation
          │
          ▼
Category & Priority Assignment
          │
          ▼
Admin Review
          │
          ▼
Status Update
          │
          ▼
Resolution
          │
          ▼
Feedback Submission
          │
          ▼
Complaint Closure

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🛠️ Technology Stack

• Core Java
• Object-Oriented Programming (OOP)
• Java Collections (ArrayList)
• File Handling (Serialization)
• Java Time API
• VS Code
• Git & GitHub

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📂 Project Structure

OnlineComplaintManagementSystem
│
├── src
│   ├── model
│   │     ├── User.java
│   │     ├── Admin.java
│   │     └── Complaint.java
│   │
│   ├── service
│   │     ├── UserService.java
│   │     └── ComplaintService.java
│   │
│   ├── storage
│   │     └── FileManager.java
│   │
│   ├── utils
│   │     ├── IDGenerator.java
│   │     └── Validator.java
│   │
│   └── Main.java
│
├── data
│     ├── users.dat
│     └── complaints.dat
│
├── screenshots
│
├── README.md
└── LICENSE

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📋 Functional Modules

User

• Register
• Login
• Submit Complaint
• View Own Complaints
• Submit Feedback
• Logout

Admin

• Login
• View All Complaints
• Search Complaint
• Update Complaint Status
• Search by Category
• Search by Status
• View Statistics
• Logout

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📊 Complaint Status Flow

Submitted
    │
    ▼
Under Review
    │
    ▼
In Progress
    │
    ▼
Resolved
    │
    ▼
Closed

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💾 Data Storage

The project uses Java File Handling for persistent storage.

• users.dat → Stores registered users
• complaints.dat → Stores complaint records

Data remains available even after restarting the application.

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▶️ How to Run

Compile

javac Main.java

Run

java Main

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📸 Screenshots

Project Structure

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Home Menu

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User Registration

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User Login

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Submit Complaint

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View Complaints

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Admin Dashboard

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Complaint Status Update

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Source Code (VS Code)

🧪 Sample Admin Credentials

Email    : admin@gmail.com
Password : admin123

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🎯 Concepts Used

• Classes & Objects
• Encapsulation
• Inheritance
• Polymorphism
• Abstraction
• Collections Framework
• File Handling
• Exception Handling
• Modular Programming

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🚀 Future Enhancements

• Java Swing GUI
• JavaFX Interface
• JDBC with MySQL Database
• Email Notifications
• Complaint Assignment to Staff
• PDF Report Generation
• Search Filters
• REST API Integration
• Spring Boot Version
• Web Application

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👩‍💻 Author

Muskan

B.Tech (Computer Science & Engineering)

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⭐ Learning Outcomes

Through this project, I learned:

• Object-Oriented Programming
• Java Collections
• File Handling
• Modular Application Design
• Role-Based Authentication
• Complaint Workflow Design
• Console Application Development
• Git & GitHub Project Management

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📄 License

This project is licensed under the MIT License.

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⭐ If you found this project useful, consider giving it a Star on GitHub!