Spring Boot Cheat Sheet for Developers

📘 Spring Boot Annotations Cheat Sheet Sharing a quick reference PDF covering important Spring Boot annotations used in real-world backend development. This includes: ✅ Core annotations ✅ REST API annotations ✅ Dependency Injection ✅ Configuration annotations ✅ Commonly used annotations in projects Perfect for quick revision & interview preparation 🚀 #SpringBoot #Java #BackendDevelopment #JavaDeveloper #Programming #InterviewPreparation

📘 Spring Boot Cheat Sheet – Complete Quick Guide Sharing a one-page cheat sheet that covers essential Spring Boot concepts for developers. This includes: ✅ Key features & architecture ✅ REST controller example ✅ Dependency Injection (best practices) ✅ Exception handling ✅ Actuator & logging ✅ Profiles & configuration Perfect for quick revision & backend interview preparation 🚀 #SpringBoot #Java #BackendDevelopment #JavaDeveloper #Programming #InterviewPreparation

Got hit with a NullPointerException today. I kept checking the logic again and again… Turns out, I forgot to initialize an object before using it. Fix: Proper initialization before calling methods Lesson learned: Always check for null before using objects. Debugging is frustrating but also the best teacher. #Java #Debugging #DeveloperLife

Dependency Injection is not just one thing. It usually shows up in a few common forms: constructor injection, setter injection, and field injection. Each one works a little differently, but the idea behind all of them is the same: write code that is cleaner, easier to manage, and simpler to test. The more you understand these types, the easier it becomes to build applications that are flexible and easier to maintain. #SoftwareEngineering #Java #SpringBoot #DependencyInjection #CleanCode

Day 5 - Java Set Interface internal working !! 👉 Set is a collection that cannot contain duplicate values and un-ordered collection and internally using HashMap. 👉 Set has three implementations HashSet, TreeSet and LinkedHashSet. 👉 add(E element) When we add a value, internally adds a value in 'map' by calling put(E, o); E - Key & o - dummy Object #java #Backend #coding #learning #springboot #developer

#Day81 of #100DaysOfCode Focused on understanding functions (methods) in Java and how to write reusable code. Covered: - Creating functions with and without return types - Passing parameters and using arguments - Implementing logic using functions Practiced problems like sum calculation, even/odd check, and factorial using functions. #Java #Programming #Functions #100DaysOfCode

Ever faced strange bugs because multiple objects were created unexpectedly? That’s where the Singleton Design Pattern comes in, but a basic Singleton is NOT thread safe. In real world applications (especially backend systems), this can lead to: - Race conditions - Data inconsistency - Hard to debug production issues In this article, I break down: - What Singleton really is - Why thread safety matters in modern applications - All major approaches to make it thread safe (with Java examples) - Best practices used in the industry If you're preparing for interviews, this is a must know concept. Read the full article here: https://lnkd.in/dbCyGExM #Java #SingletonDesignPattern #ThreadSafety #SystemDesign #SoftwareEngineering #BackendDevelopment #Programming

Day 45-What I Learned In a Day (JAVA) Today I explored some important concepts related to static in Java: 🔹 Static Method Learned how static methods belong to the class and can be called without creating an object. 🔹 Static Initializer (Static Block) Understood how a static block is executed only once when the class is loaded. 🔹 Single-Line Static Initializer Explored how we can initialize static variables in a single line. 🔹 Multi-Line Static Initializer Learned how to use static blocks for complex initialization logic. Practiced 👇 #Java #Programming #LearningJourney #Coding #100DaysOfCode

🚨 Java fact about constructors 👇 Constructors don’t have a return type… But something still returns an object 🤯 Example: class User { User() { System.out.println("Constructor called"); } } User user = new User(); 👉 What’s actually happening? - "new" keyword creates the object - Allocates memory - Calls the constructor - Returns the reference 👉 Important: Constructor itself does NOT return anything 👉 "new" keyword returns the object --- 👉 This is NOT a constructor: class User { void User() { } ❌ } 👉 It becomes a normal method 💡 Many people think constructor returns object… but actually new keyword does that Did you know this? 👇 #Java #CoreJava #Programming #BackendDeveloper #Coding #TechLearning