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Object-Oriented Programming

Object-Oriented Programming (OOP) is the most widely used programming paradigm, enabling developers to model complex systems as collaborating objects with data and behaviour. OOP fundamentals underpin Java, C++, Python, Ruby, Kotlin, Swift, and C# — understanding them deeply is foundational to becoming a professional software engineer.

What is Object-Oriented Programming?

OOP is built on four core principles: Encapsulation (hiding implementation details behind interfaces), Inheritance (extending and reusing behaviour from parent classes), Polymorphism (treating different objects uniformly through shared interfaces), and Abstraction (modelling concepts at the right level of detail). Modern OOP also encompasses SOLID principles, design patterns (Factory, Observer, Strategy, Decorator), and the distinction between composition and inheritance.

Why Object-Oriented Programming matters for your career

OOP skills are assessed in virtually every software engineering interview through design questions and coding challenges. Engineers who understand OOP deeply write more maintainable code and can work effectively across Java, Python, C++, and Kotlin codebases. Senior engineers are expected to apply design patterns naturally to solve architectural problems.

Career paths using Object-Oriented Programming

OOP is foundational for every software engineering role, particularly Backend Developer, Android Developer (Kotlin/Java), iOS Developer (Swift), Game Developer, and Enterprise Software Engineer roles where OOP patterns are dominant.

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Quadigi

Test Automation Engineer (Python)

VilniusFull Time
PythonObject-Oriented ProgrammingTest AutomationTesting+1

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Frequently asked questions

Is OOP better than functional programming?▼

Neither is inherently better — they're tools for different situations. OOP models entities and their interactions well; functional programming excels at data transformation pipelines. Modern languages like Kotlin and Scala blend both paradigms.

What are the SOLID principles?▼

SOLID stands for: Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion. These principles guide object-oriented design toward code that's easier to maintain and extend.

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