How does Spring Boot build on top of Core Java basics?

Explanation & Concept

Core Java provides the standard library, collections, and concurrency primitives. **Spring Boot** adds an enterprise framework layer providing: 1. Inversion of Control (IoC) and Dependency Injection (DI) to manage object lifecycles. 2. Opinionated starter templates that configure databases, web servers (embedded Tomcat), and metrics automatically. 3. Aspect-Oriented Programming (AOP) for declarative transactions (`@Transactional`).

Code Example

java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.*;

@SpringBootApplication
@RestController
public class QuickApp {
    @GetMapping("/api/greet")
    public String greet(@RequestParam(defaultValue = "World") String name) {
        return "Hello, " + name + " from Spring Boot!";
    }

    public static void main(String[] args) {
        SpringApplication.run(QuickApp.class, args);
    }
}

How It Works & Key Takeaways

Spring Boot converts standard Java classes into production-grade REST APIs with embedded servers and automatic JSON serialization in just a few annotations.