🏦 Kotlin CLI Banking System (Practice Project)

This project is built entirely for practice purposes, aiming to review and reinforce core programming concepts in Kotlin. It simulates a simple banking system via the command line (CLI) and is structured using clean design principles.

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Login and Register Menu

Bank Menu

Create Bank Account

Transaction Menu

🎯 Project Purpose

• ✅ Practice Kotlin Basics:
  Variables, conditionals, loops (for, while, do-while), functions, lambda expressions, collections, error handling, etc.

• ✅ Review Object-Oriented Programming (OOP) Principles:

  • Classes and Objects
  • Inheritance
  • Polymorphism (Overriding & Overloading)
  • Encapsulation (Access Modifiers)
  • Abstraction (Abstract Classes and Methods)
  • Special Kotlin classes: data, enum, sealed, anonymous
  • companion object

• ✅ Apply Clean Architecture & Separation of Concerns (SoC):
  Code is modularized into model, dao, service, and view layers to ensure maintainability and scalability.

• ✅ Use Basic Design Patterns:

  • DAO (Data Access Object) pattern
  • Singleton for services
  • In-memory storage for data simulation

• ✅ Prepare for Coroutine Integration:
  Although not the focus here, the project structure is ready to support Kotlin Coroutines for asynchronous operations.

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📁 Project Structure

├── data/
│   ├── dao/           → Interfaces & in-memory implementations
│   └── model/         → Data classes (User, BankAccount, Transaction)
├── service/           → Business logic for users, accounts, and transactions
├── utils/             → Coroutine utils (optional)
├── view/              → Console-based UI for interaction
└── Main.kt            → Entry point

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🚀 How to Run

git clone  https://github.com/alanhasn/Kotlin-CLI-Banking-System-with-OOP-Coroutines-DAO-SoC-Practice

// now you can run Main.kt file

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✅ Notes

• This is not a production-grade system, but rather a personal practice project.
• Ideal for anyone preparing for a Kotlin exam or reviewing concepts before building real apps.

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Feel free to fork, modify, and expand it!