Java Mindset for Backend Developers

💻 Revisiting Java Fundamentals from Scratch After working on Spring Boot, REST APIs, and backend projects, I realized the importance of having a strong foundation. So I’ve decided to revisit Java from scratch to strengthen my core concepts. 📌 Why I’m doing this: ✔ To improve problem-solving skills ✔ To write cleaner and more efficient code ✔ To deeply understand core concepts like OOP, collections, and memory management 📌 What I’ll focus on: 🔹 Core Java basics 🔹 OOP principles 🔹 Collections Framework 🔹 Exception Handling 🔹 Multithreading (basics) 📌 My goal: Not just to use frameworks, but to understand what’s happening behind the scenes. Building stronger fundamentals, step by step 🚀 #Java #LearningJourney #BackendDevelopment #Programming #SoftwareDevelopment

My first Java code was a disaster. Nested loops inside nested loops. No exception handling. God classes everywhere. My senior dev reviewed it and said "this works but it will haunt you later." He was right. I spent 3 weeks refactoring it. Clean code is not about being perfect. It is about respecting your future self. What is the worst code you ever wrote and laughed about later? Tell me below. #Java #CleanCode #SoftwareDevelopment #BackendDevelopment #JavaDeveloper #CodeReview

Choosing the right dependency injection approach is important for writing clean and maintainable Spring Boot applications. This visual guide compares Field Injection (@Autowired) with Constructor Injection and explains why one is preferred over the other. What’s covered: 👉 Field Injection (@Autowired) and its limitations 👉 Constructor Injection as the recommended approach 👉 Key problems like hidden dependencies and testing difficulty 👉 Benefits like immutability, better testability, and SOLID principles 👉 How circular dependencies are handled Key takeaway: • Constructor Injection is the recommended approach • Makes dependencies explicit and code more maintainable • Improves testability and avoids common runtime issues Pro tip: Using Lombok’s @RequiredArgsConstructor can reduce boilerplate while following best practices. Useful for: ✔ Java developers ✔ Spring Boot learners ✔ Interview preparation A must-know concept for writing clean and scalable backend code. #SpringBoot #SpringFramework #Java #DependencyInjection #CleanCode #BackendDevelopment #Developers

💡 Think before you catch! If your code is full of try-catch blocks, it might be time to rethink your design, not your exception handling. Here’s a better approach I’ve learned while working with Spring Boot: #SpringBoot #Java #CleanArchitecture #Backend #CodingTips #Developers https://lnkd.in/gTaW-Tbj

Most people think they know Java basics… until questions like these show up Try this, 👉 JDK vs JRE vs JVM Who actually runs your code? And what do you really need to install? 👉 Primitive types How many are there? Which one is not even numeric? Be honest — confident or guessing? 😄 I’ll drop more later today. #Java #Coding #Developers

Ever wondered what happens after you write Java code? 🤔 👉 .java → .class → JVM → Execution That’s where JVM Architecture comes in! ⚙️ Class Loader 🧠 Memory Areas 🚀 Execution Engine ♻️ Garbage Collector All working together to run your code smoothly 💯 Drop a 🔥 if this helped you! #Java #JVMArchitecture #CodingJourney #ProgrammerLife #SoftwareEngineer #LearnProgramming #TechExplained #CodeDaily #Developers #JavaLearning

Day 14/60 🚀 Extends Thread vs Implements Runnable — Clear Comparison In Java multithreading, there are two main ways to create a thread: 👉 Extending the "Thread" class 👉 Implementing the "Runnable" interface This comparison highlights the key differences 👇 --- 💡 When you extend the Thread class 🔹 You cannot extend another class (Java doesn’t support multiple inheritance) 🔹 Task logic and thread execution are tightly coupled 🔹 Code reusability is limited 🔹 Slight overhead due to additional Thread methods 🔹 Maintenance becomes harder as code grows 👉 Best suited for simple or quick implementations --- 💡 When you implement Runnable interface 🔹 You can still extend another class 🔹 Task and thread are loosely coupled 🔹 Better code reusability (same task can run in multiple threads) 🔹 No unnecessary overhead 🔹 Easier to maintain and scale 👉 Preferred in real-world applications --- 🔥 Core Idea Both approaches ultimately execute the same method: ➡️ "run()" But the difference lies in design flexibility and scalability --- ⚖️ Simple Conclusion ✔ Use Thread → when simplicity matters ✔ Use Runnable → when flexibility, scalability, and clean design matter --- 📌 One-line takeaway: Runnable focuses on task, Thread focuses on execution --- #Java #Multithreading #CoreJava #Thread #Runnable #JavaDeveloper #Programming #SoftwareEngineering #BackendDevelopment #Concurrency #TechConcepts #CodingJourney #DeveloperLife #InterviewPreparation #FreshersJobs #LearnJava #100DaysOfCode #WomenInTech #CareerGrowth #LinkedInLearning #CodeNewbie

A small Java mistake once taught me a big engineering lesson. We had a microservice that was “working fine” in lower environments… but in production, it started slowing down under load. After digging in, the issue wasn’t infrastructure or scaling. It was a simple thing: 👉 Improper use of parallel streams + blocking calls What looked clean in code was actually hurting performance at scale. That experience changed how I write Java: ✔ Always think about thread behavior ✔ Avoid mixing blocking and parallel operations ✔ Measure before optimizing 💡 Insight: In Java, the code that looks elegant isn’t always the code that scales. Sometimes, simplicity beats cleverness. #Java #BackendDevelopment #Performance #SoftwareEngineering #LessonsLearned

Java + Spring Boot Journey What I’ll focus on: • Java fundamentals • Data Structures & Algorithms • Spring Boot (REST APIs) Goal: Build real-world projects and stay consistent. I’ll be sharing my progress here regularly. #Java #SpringBoot #Coding #BackendDevelopment

I spent years writing Java 8 code. Turns out I was only using about 20% of what it could do. Here are 9 Java 8 features that changed how I write code — swipe through the carousel to see all of them with real before/after examples. 👇 ― Most devs stop at lambdas and streams. Fair. They're great. But there's a whole layer underneath that nobody talks about: → Collectors that group, count, and join data in one line → Optional that chains safely instead of crashing on null → CompletableFuture that makes async code actually readable → Map methods that eliminate 6-line "check then insert" patterns → Predicate chaining that turns filter logic into reusable building blocks These aren't niche. They're in every modern Java codebase. ― The one that hit me hardest? computeIfAbsent. Before I found it, I was writing this every time:  if (!map.containsKey(key)) {   map.put(key, new ArrayList<>());  }  map.get(key).add(value); After:  map.computeIfAbsent(key, k -> new ArrayList<>()).add(value); Same logic. One line. No cognitive overhead. That's what Java 8 does when you actually use it. ― Swipe through the carousel for all 11 tricks — each slide has a concrete code example so you can start using it today. Save it for your next code review. 🔖 If you've been writing Java for a while and one of these was new to you — drop it in the comments. Curious which ones land. ― ♻️ Repost if this would help someone on your team. 🔔 Follow for more posts like this every week. #Java #Java8 #JavaDeveloper #JavaProgramming #SoftwareDevelopment #SoftwareEngineering #CleanCode #BackendDevelopment #BackendEngineering #Programming #Coding #CodeNewbie #100DaysOfCode #DevTips #TechTips #LearnToCode #OpenSource #SpringBoot #Microservices #Tech