Object-Oriented Programming

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Coding
Theory
Quiz

    Encapsulation & Access Control

    • Bank Account with Private State

      Junior

    • User Factory - Static Factory Method Pattern

      Junior

    Inheritance & Polymorphism

    • Polymorphic Shape Area Calculator

      Junior

    • Vehicle Registry with Polymorphic Speed

      Junior

    • Employee Payroll System

      Junior

    • Operation Enum with Behavior

      Junior

    • Polymorphic Retail Product Catalog

      Mid

    • Multi-Format Media Metadata Extractor

      Mid

    • Smart Home Device Controller

      Mid

    • Bank Account Hierarchy

      Mid

    Abstraction & Interfaces

    • Payment Processor with Pluggable Providers

      Mid

    • Plugin-Based Notification Dispatcher

      Mid

    • Diamond Problem Resolver

      Mid

    Composition & Exceptions

    • Custom Exception Hierarchy with Global Handler

      Mid

    • Smart Home Device Refactor

      Mid

    • Logger Mixin Across Unrelated Classes

      Mid

    • Payment Gateway Exception Handler

      Mid

    Value Objects & Immutability

    • Complex Number with Operator Overloading

      Junior

    • Immutable Money Value Object

      Junior

    • Point Equals and HashCode

      Junior

    • Employee Comparable and Comparators

      Junior

    • Immutable Point with Copy-on-Write API

      Junior

    • Deep Copy Company Hierarchy

      Mid

    • Comparable Money Class

      Mid

    Generics & Type Safety

    • Generic Result Wrapper

      Junior

    • Generic Bounded Comparable Box

      Junior

    • Generic SQL Repository

      Mid

    • Type-Safe Event Bus

      Mid