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1. Commits on Mar 13, 2026

   • Add initial implementation of bike and car classes, along with user classes (Driver, Passenger) and ride management (Ride, RideMatchingService). This setup enables fare calculation based on vehicle…

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   • Add initial implementation of ride-sharing application with core classes: Location, Vehicle, Driver, Passenger, and RideSharingServiceApp. This setup allows for adding drivers and passengers, booki…

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   • Add Facade Pattern implementation with ApiGateway, UserService, and OrderService classes. The ApiGateway class simplifies interactions with user and order services, demonstrating the facade design …

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   • Add Composite Pattern implementation with File and Folder classes. The File class represents individual files, while the Folder class manages a collection of File instances, demonstrating the compo…

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2. Commits on Mar 6, 2026

   • Add Proxy Pattern implementation with HighResImage and ImageProxy classes. The HighResImage class loads and displays high-resolution images, while the ImageProxy class optimizes image loading by de…

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   • Add Decorator Pattern implementation with Beverage, Coffee, and various decorators (Milk, Whip Cream, Sugar). This allows for dynamic addition of features to coffee objects, demonstrating the flexi…

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   • Add Adapter Pattern implementation with NotificationService, EmailNotificationService, SendGridEmailService, and SendGridAdapter classes. The Adapter pattern allows the OrderService to utilize diff…

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   • Add Prototype Pattern implementation with ChessPiece and ChessBoard classes. The ChessPiece class allows for creating chess pieces with specific attributes, while the ChessBoard class manages the p…

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   • Add Builder Design Pattern implementation with Laptop and LaptopBuilder classes. The Laptop class allows for flexible specification of laptop attributes, while the LaptopBuilder class provides a fl…

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3. Commits on Mar 5, 2026

   • Add implementations of North Indian, South Indian, and Chinese dishes using the Abstract Factory Pattern. Introduce Food, Starter, MainCourse, and Dessert classes to enhance meal preparation flexib…

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   • Refactor Pizza and Burger classes to inherit from Food class, enhancing the factory pattern implementation. This change promotes code reuse and aligns with the design principles of the factory patt…

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   • Add Factory Pattern implementation with Food, Pizza, Burger, and Pasta classes. Introduce FoodFactory for object creation, enhancing the RestrauntService to utilize the factory for order processing…

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   • Add Singleton Pattern implementation with Logger class. The Logger class ensures a single instance is created for logging messages, tracks the number of logs, and demonstrates the singleton design …

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4. Commits on Feb 25, 2026

   • Add Mediator Pattern implementation with ControlTower and Airplane classes. The ControlTower manages communication between registered Airplane instances, allowing them to send and receive messages,…

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5. Commits on Feb 24, 2026

   • Add new implementations for OOP concepts: Introduce Shape and Rectangle classes for abstraction, Student class for encapsulation, Bank class for encapsulation with private attributes, Dog class for…

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   • Add State Pattern implementation with TransportMode, BikeMode, WalkMode, and TransportService classes. The TransportMode class defines the interface for different transport modes, while BikeMode an…

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6. Commits on Feb 23, 2026

   • Add Iterator Pattern implementation using a linked list for managing a playlist. Introduce Song, Node, Iterator, PlaylistIterator, and Playlist classes to demonstrate the iterator design pattern wi…

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   • Add Template Pattern implementation with DataParser and CSVParser classes. The DataParser class defines the template method for parsing, while CSVParser provides the specific implementation for par…

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   • Add Command Pattern implementation with BurgerOrder, PizzaOrder, Chef, Waiter, and Order classes. The BurgerOrder and PizzaOrder classes encapsulate order execution, while the Chef class handles co…

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   • Add Strategy Pattern implementation with DiscountStrategy, DiwaliStrategy, HoliStrategy, and DiscountService classes. The DiscountService utilizes different discount strategies to apply discounts, …

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7. Commits on Feb 20, 2026

   • Add Observer Pattern implementation with WeatherStation, TVDisplay, and MobileDisplay classes. The WeatherStation manages temperature updates and notifies registered observers, while TVDisplay and …

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8. Commits on Feb 18, 2026

   • Add Memento Pattern implementation with History, TextEditor, and TextMemento classes. The History class manages state saving and undo functionality, while TextEditor handles text manipulation and r…

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9. Commits on Feb 12, 2026

   • Add bad and good examples of the Dependency Inversion Principle (DIP) showcasing the transition from concrete implementations in the bad example to an abstracted approach using interfaces in the go…

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   • Add bad and good examples of the Interface Segregation Principle (ISP) demonstrating proper use of interfaces with separate responsibilities for Employee and Robot classes.

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   • Add bad and good examples of the Liskov Substitution Principle (LSP) with implementations for BankAccount, SavingsAccount, and FixedDepositAccount. Introduce WithdrawableAccount for better abstract…

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   • Add user and user repository classes for SRP demonstration, separating user data management and database operations. Include bad and good examples for clarity.

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10. Commits on Feb 11, 2026

    • Add examples of the Open/Closed Principle (OCP) with a bad implementation using conditional statements and a good implementation using abstract classes and polymorphism for payment processing.

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    • Add user and user repository classes to demonstrate Single Responsibility Principle (SRP) with separate responsibilities for user data management and database operations.

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    • Add UML Basics examples: association, aggregation, composition, inheritance, and dependency classes demonstrating OOP concepts with practical implementations.

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    • Add notification system with Email, SMS, and WhatsApp message classes. Implement abstract Message and Notifiable base classes for polymorphic behavior.

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    • Add .gitignore and expand README with course details

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11. Commits on Feb 9, 2026

    • base setup

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