Object-Oriented Programming for MAANG Interviews

A book-shaped table of contents for OOP: paradigm foundations, the four pillars, object relationships, SOLID/GRASP design principles, memory and runtime internals, GoF design patterns, language-specific OOP, and OOP at system scale — cross-linking existing pattern, concurrency, and low-level-design notes instead of duplicating them.

1 — Interfaces vs Abstract Classes

Examines Differences, Trade-offs, Language Implementations, and Interview Questions as the core sub-topics of interfaces vs abstract classes.

2 — Object Equality

Examines Identity, Equality, Hash Codes, Value Objects, and Reference Objects as the core sub-topics of object equality.

3 — Immutability

Examines Immutable Objects, Thread Safety, Builders, and Persistent Data Structures as the core sub-topics of immutability.

5 — Object Serialization

Examines Serialization, Deserialization, Versioning, and Security Concerns as the core sub-topics of object serialization.