Dependency Injection in Spring — LIVE Code Example | Constructor vs Setter vs Field Injection

Dependency Injection — Writing ALL 3 Types in Real Java Code! Theory is great — but code is better! In this video, we write all 3 types of Dependency Injection in Spring with a real BusinessClass example using Dependency1 and Dependency2. You'll see exactly how Field, Setter, and Constructor injection look in code, and why Spring recommends Constructor Injection every single time! 📌 What You'll Learn: ✅ Setting up @Component for Dependency1 and Dependency2 ✅ Field Injection — @Autowired directly on fields (why it's risky!) ✅ Setter Injection — setDependency1() and setDependency2() with @Autowired ✅ Constructor Injection — BusinessClass(Dependency2, Dependency1) the right way ✅ Why this.dependency1 = dep1 in constructor is cleaner and safer ✅ Spring's official recommendation — Constructor Injection and why ✅ Real side-by-side comparison of all 3 approaches in one class ✅ When to use Setter vs Constructor injection in real projects 🧠 Who Is This For? 👉 Java developers who watched Part 1 and want to see real code 👉 Spring beginners who learn best by writing actual code 👉 Devs preparing for Spring Boot & Java backend interviews 👉 Anyone who wants to stop using field injection and do it the right way 🔔 Subscribe — New Spring videos every week! 👍 Like if constructor injection finally clicked for you! 💬 Comment — Were you doing field injection before? No judgment! 😄👇 #DependencyInjection #SpringFramework #SpringBoot #ConstructorInjection #SetterInjection #FieldInjection #Autowired #JavaSpring #SpringCode #JavaDeveloper #BackendDevelopment #LearnJava #JavaProgramming #SpringCore #LiveCoding #JavaBackend #SpringTutorial #JavaBeginners #CodingTutorial #JavaDev #TechEducation #SpringInterview #JavaInterview #ProgrammingTips #SpringSeries #RealCode #DICode #SpringAnnotations #JavaCode #CodeWalkthrough