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 — UML Class Diagrams

Reference appendix entry for sketching class diagrams — classes, attributes, methods, and relationship notation used throughout this book.

2 — UML Sequence Diagrams

Reference appendix entry for sequence diagrams — object interactions and message ordering over time.

3 — UML State Diagrams

Reference appendix entry for state diagrams — modeling object lifecycle and state transitions.

4 — UML Activity Diagrams

Reference appendix entry for activity diagrams — modeling control flow and business logic across objects.