Deciding What Should Exist as a Service

Hello Everyone👋👋 How does Java handle multiple inheritance? Java does not support multiple inheritance through classes to avoid complexity and ambiguity. Instead, it supports multiple inheritance through interfaces, where a class can implement multiple interfaces. #Java #backend #frontend #FullStack #software #developer #programming #code #class #object #Array #ArrayList #collections #SpringBoot #SpringAI #AI #OpenAI #LLM #Claude #Nodejs #React #Angular #Microservices #inheritance #interface #abstract #interview

Becoming a Java Full Stack Developer is all about learning the right skills step by step. 🔹 Master Core Java & OOP concepts 🔹 Learn Spring Boot for backend development 🔹 Explore frontend technologies like React or Angular 🔹 Work with databases like MySQL & MongoDB 🔹 Build real-time projects Stay consistent and focus on practical learning to become a job-ready developer. #Java #FullStackDeveloper #JavaDeveloper #SpringBoot #React #WebDevelopment #Programming #SoftwareDevelopment #CareerGrowth

🚀 Exploring CompletableFuture in Java (When to use & when to avoid) While revisiting Java 8 concepts, I explored CompletableFuture and how it helps in handling asynchronous operations. 💡 A common backend scenario: An API needs to call multiple services: User Service Order Service Payment Service If executed sequentially: getUser(); getOrder(); getPayment(); ⏱️ Total time increases as each call waits for the previous one. 👉 Using CompletableFuture, we can execute them in parallel: CompletableFuture<String> user = CompletableFuture.supplyAsync(() -> getUser()); CompletableFuture<String> order = CompletableFuture.supplyAsync(() -> getOrder()); CompletableFuture<String> payment = CompletableFuture.supplyAsync(() -> getPayment()); CompletableFuture.allOf(user, order, payment).join(); ⚡ Independent tasks run concurrently → better performance ✅ When to use CompletableFuture: Calling multiple independent APIs Microservices communication Improving response time Parallel data fetching ⚠️ When to avoid: When tasks depend on each other Heavy blocking operations (like DB calls without proper thread management) Small/simple logic where async adds complexity 📌 My takeaway: Even if not used directly yet, understanding where it fits helps design better scalable systems. Looking forward to applying this in real projects. Have you used CompletableFuture in your applications? Any challenges or best practices? 👇 #Java #SpringBoot #BackendDevelopment #Microservices #CompletableFuture #JavaDeveloper #SoftwareEngineering

Hello Everyone👋👋 What is the difference between an Error and an Exception in Java? Both Error and Exception are subclasses of Throwable. Error: Represents serious problems that a reasonable application should not try to catch. They indicate unrecoverable conditions, typically related to the JVM environment itself (e.g., OutOfMemoryError, StackOverflowError). Exception: Represents conditions that an application might want to catch and handle. They are problems that happen during the normal execution of a program but can be gracefully recovered from. #Java #backend #frontend #AI #FullStack #software #developer #programming #code #class #object #inheritance #super #constructor #SpringBoot #SpringAI #Java26 #Array #ArrayList #GenAI #Claude #LLM #RAG #Microservices #AWS #SystemDesign #Nodejs #React #interview

🚀 Java Arrays felt limiting today… until I explored ArrayList. A normal array has a fixed size, which means once created, its size cannot grow. That’s where ArrayList feels super useful 👇 ✅ Dynamic size ✅ Maintains insertion order ✅ Allows duplicates ✅ Easy built-in methods like add(), remove(), get() Small example: ArrayList skills = new ArrayList<>(); skills.add("Java"); skills.add("Spring Boot"); skills.add("React"); System.out.println(skills); Output: [Java, Spring Boot, React] 💡 Key takeaway: Use ArrayList when the number of elements is not fixed. It gives the flexibility that normal arrays don’t. Still exploring how it resizes internally 👀 #Java #ArrayList #LearningInPublic #BackendDevelopment

Hello Everyone👋👋 What is the final variable? In Java, the final variable is used to restrict the user from updating it. If we initialize the final variable, we can't change its value. It once assigned to a value, can never be changed after that. The final variable, which is not assigned to any value, can only be assigned through the class constructor. #Java #backend #frontend #FullStack #software #developer #programming #code #class #object #Array #ArrayList #collections #super #constructor #SpringBoot #SpringAI #AI #GenAI #OpenAI #Nodejs #Angular #React #AWS #Java26 #interface #abstract #interview

Hello Everyone👋👋 What is Java String Pool? The Java String Pool is a special memory area where Java stores string literals to optimize memory usage. When a string literal is created, Java checks the pool to see if an identical string already exists. If it does, the same reference is used, reducing memory consumption and improving performance. #Java #backend #frontend #FullStack #software #developer #programming #code #class #object #lambda #inheritance #Array #ArrayList #collections #super #constructor #Java26 #GenAI #AI #OpenAI #Claude #Nodejs #Angular #React #interface #abstract #interview

Hello Everyone👋👋 What are the different types of access modifiers in Java? Public: Accessible from anywhere. Protected: Accessible within the same package or by subclasses in other packages. Default (package-private): Accessible only within the same package. Private: Accessible only within the same class. #Java #backend #frontend #FullStack #software #developer #programming #code #class #object #Array #ArrayList #collections #SpringBoot #SpringAI #OpenAI #GenAI #AI #Nodejs #React #Angular #multithreading #interface #abstract #super #constructor #interview

🚨 Java Developers — Beware of the FINALLY Block! Most devs think they understand how finally behaves until it overrides a return value, mutates an object, or hides an exception completely. Here are the most important — and dangerous — finally block traps every Java developer must know 👇 🔥 1. finally ALWAYS executes Even if the method returns or throws an exception. This is why cleanup logic goes here. But it also means: try { return 1; } finally { System.out.println("Still runs"); } ⚠️ 2. finally can override your return value This is the #1 interview trap. try { return 1; } finally { return 2; } 👉 Output: 2 finally silently replaces your original return. This has caused countless production bugs. 🧠 3. It can modify returned objects Even if the object is returned, finally still gets a chance to mutate it. StringBuilder sb = new StringBuilder("Hello"); try { return sb; } finally { sb.append(" World"); } 👉 Output : Hello World ➡️ Because reference types are not copied — only primitives are. 💥 4. finally can swallow exceptions Huge debugging nightmare. try { throw new RuntimeException("Original error"); } finally { return; // Exception is LOST } The program proceeds as if nothing went wrong! This is why return statements inside finally are dangerous. 🚫 5. Rare cases where finally does NOT run System.exit() JVM crash Hardware/power failure Fatal native code error Anywhere else → it ALWAYS runs. ✅ Best Practices for Safe Java Code ✔ Use finally for cleanup only ✔ Prefer try-with-resources (Java 7+) ✔ Avoid return inside finally ✔ Keep finally blocks minimal ✔ Avoid modifying returned objects 💡 When you understand the actual lifecycle of try → catch → finally, you avoid subtle, production-breaking bugs that even senior developers sometimes miss. #Java #JavaDeveloper #ProgrammingTips #CodeQuality #CleanCode #SoftwareEngineering #Developers #CodingTips #TechLearning #FullStackDeveloper #BackendDevelopment #JavaInterview #100DaysOfCode #LearningEveryday #TechCommunity

Hello Everyone👋👋 How does Java achieve platform independence? Java achieves platform independence through the use of the Java Virtual Machine (JVM). Java code is compiled into bytecode, which is then interpreted by the JVM on any platform, allowing the same code to run on different systems. #Java #backend #frontend #FullStack #software #developer #programming #code #class #object #inheritance #lambda #super #constructor #interface #abstract #SpringAI #AI #GenAI #SpringBoot #Nodejs #React #Angular #Java26 #multithreading #Array #interview