🌱 Spring Boot Interview Notes β€” 3 Years Experience

144 Questions Β· Full Answers Β· Code Examples Β· Real-World Production Scenarios


πŸ“‹ Table of Contents


πŸ”· Spring Core

🧠 Mental Model: Think of Spring IoC as a Restaurant Kitchen. You (the code) don’t fetch ingredients yourself. The Kitchen Manager (Spring Container) prepares beans and hands them to you when needed. You just declare what you need β€” Spring delivers it. β€œDon’t call us, we’ll call you.”

[ Your Code ]  declares β†’ [ IoC Container ]  injects β†’ [ Dependencies ]
   OrderService            ApplicationContext          PaymentService
                                                       InventoryService