Java 25 Solves Lazy Initialization Problem with StableValue API

🚀 Java Fundamentals: Process vs Thread & Thread Creation in Java Ever wondered about the difference between a Process and a Thread in Java? Or how to efficiently create and manage threads? Let’s break it down! 🧠 Process vs Thread: • Process: An independent program in execution with its own memory space. • Thread: A lightweight unit within a process that shares memory and resources. 🧵 How to Create Threads in Java: ✅ Extend the Thread class ✅ Implement the Runnable interface ✅ Use ExecutorService (Recommended for better management) 💡 Quick Q&A: Q1: Can a thread exist without a process? A1: No. A thread is always part of a process and cannot exist independently. Q2: Which method is better for creating threads—extending Thread or implementing Runnable? A2: Implementing Runnable is generally better because it allows your class to extend other classes, promotes flexibility, and follows the composition-over-inheritance principle. Q3: Why is ExecutorService preferred for thread management? A3: ExecutorService provides a high-level API, manages thread lifecycles efficiently, reduces overhead, and supports thread pooling for better performance. Whether you’re working on concurrent applications or optimizing performance, mastering threads is key! 💻 What’s your go-to approach for multithreading in Java? Share your experiences below! 👇 #Java #Multithreading #Concurrency #SoftwareDevelopment #Coding #TechTips #Programming #Developer

🎯 Java Generics & PECS: Writing Flexible & Type-Safe Code Generics in Java allow you to write reusable, type-safe code. But when dealing with collections and inheritance, the PECS principle helps: PECS Principle Producer → Extends (? extends T) If a collection produces objects for you, use extends. Example: List<? extends Number> → safe to read, not safe to write. Consumer → Super (? super T) If a collection consumes objects you provide, use super. Example: List<? super Integer> → safe to write, reading gives Object. 💡 Rule of Thumb: “Producer extends, Consumer super.” Example Copy code Java List<? extends Number> numbers = List.of(1, 2.5); Number n = numbers.get(0); // ✅ safe // numbers.add(3); // ❌ compile error List<? super Integer> integers = new ArrayList<Number>(); integers.add(10); // ✅ safe Object o = integers.get(0); // ✅ returns Object Why it matters: Makes libraries and APIs flexible and type-safe. Avoids runtime ClassCastException. Widely used in collections, streams, and frameworks. #Java #Generics #CleanCode #JavaTips #SoftwareEngineering #BackendEngineering #PECS

Hello Java Developers, 🚀 Day 13 – Java Revision Series Today’s topic covers a lesser-known but very important enhancement introduced in Java 9. ❓ Question Why do interfaces support private and private static methods in Java? ✅ Answer Before Java 9, interfaces could have: abstract methods default methods static methods But there was no way to share common logic internally inside an interface. To solve this problem, Java 9 introduced: private methods private static methods inside interfaces. 🔹 Why Were Private Methods Introduced in Interfaces? Default methods often contain duplicate logic. Without private methods: Code duplication increased Interfaces became harder to maintain Private methods allow: Code reuse inside the interface Cleaner and more maintainable default methods Better encapsulation 🔹 Private Method in Interface A private method: Can be used by default methods Can be used by other private methods Cannot be accessed outside the interface Cannot be overridden by implementing classes 📌 Used for instance-level shared logic. 🔹 Private Static Method in Interface A private static method: Is shared across all implementations Can be called only from: default methods static methods inside the interface Does not depend on object state 📌 Used for utility/helper logic. #Java #CoreJava #NestedClasses #StaticKeyword #OOP #JavaDeveloper #LearningInPublic #InterviewPreparation

Day 13 & 14 - 🚀Methods in Java and Their Types In Java, a method is a block of code that performs a specific task. Methods help write clean, reusable, and well-structured code. 🔹 What is a Method? A method: ✔ Reduces code duplication ✔ Improves readability ✔ Makes programs easier to maintain 🔹 Basic Method Syntax accessModifier returnType methodName(parameters) { // method body } ➡️Types of Methods in Java 1️⃣ Predefined Methods Built-in Java methods like println() and sqrt() 2️⃣ User-Defined Methods Methods created by the programmer 3️⃣ Static Methods Belong to the class and can be called without creating an object 4️⃣ Instance Methods Belong to objects and are called using object references. 🔹 Method Overloading When multiple methods have the same name but different parameters, it’s called method overloading. ✨ Pro Tip: Small, well-named methods make your Java code cleaner and more professional. 💬 Are you learning Java right now? Let’s grow together 🚀 #Java #CoreJava #Programming #OOP #JavaMethods #CodingJourney

📌 start() vs run() in Java Threads Understanding the difference between start() and run() is essential when working with threads in Java. 1️⃣ run() Method • Contains the task logic • Calling run() directly does NOT create a new thread • Executes like a normal method on the current thread Example: Thread t = new Thread(task); t.run();  // no new thread created 2️⃣ start() Method • Creates a new thread • Invokes run() internally • Execution happens asynchronously Example: Thread t = new Thread(task); t.start(); // new thread created 3️⃣ Execution Difference Calling run(): • Same call stack • Sequential execution • No concurrency Calling start(): • New call stack • Concurrent execution • JVM manages scheduling 4️⃣ Common Mistake Calling run() instead of start() results in single-threaded execution, even though Thread is used. 🧠 Key Takeaway • run() defines the task • start() starts a new thread Always use start() to achieve true multithreading. #Java #Multithreading #Concurrency #CoreJava #BackendDevelopment

📌 Can We Use try and finally Without catch in Java? Yes, Java allows using try and finally without a catch block. Example: try {   // code that may throw an exception } finally {   // cleanup code } 1️⃣ Why This Is Allowed • The finally block is meant for cleanup • Java guarantees finally execution • Exception handling can be deferred to the caller 2️⃣ What Happens If an Exception Occurs • Exception is thrown from try • finally block executes • Exception propagates to the calling method 3️⃣ When This Pattern Is Useful • Resource cleanup when you don't want to handle the exception locally • Logging or releasing locks • Framework-level code where exception handling is centralized 4️⃣ Important Rule • The exception is NOT swallowed • finally does not handle the exception • Caller must handle or declare it 5️⃣ Example Flow try → finally → caller 🧠 Key Takeaways • catch is optional • finally is optional • try is mandatory when using either • finally executes even when an exception is thrown Using try–finally helps ensure cleanup without forcing local exception handling. #Java #CoreJava #ExceptionHandling #Programming #BackendDevelopment

📘 Day 5 – Refreshing Java Fundamentals Today I focused on revising one of the most important concepts in Java: Exception Handling. I practiced and revised the following topics: 🔹 try-catch – handling runtime errors gracefully 🔹 Multiple catch blocks – managing different exception types 🔹 finally – executing important code regardless of exceptions 🔹 throw – explicitly throwing exceptions 🔹 throws – propagating exceptions to the calling method Exception handling helps build robust, stable, and production-ready applications by preventing unexpected crashes and ensuring smooth execution. This revision is strengthening my core Java concepts, which are essential for backend development and frameworks like Spring Boot. 📈 Consistent learning and daily practice — one step closer to becoming a better Java developer. #Java #JavaFundamentals #ExceptionHandling #BackendDevelopment #LearningJourney #SoftwareEngineering #DailyLearning #Programming

Conditional Statements in Java After understanding operators, the next important topic is conditional statements. Conditional statements help the program make decisions based on conditions. In simple words, they tell Java what to do and when to do it. 𝗪𝗵𝘆 𝗖𝗼𝗻𝗱𝗶𝘁𝗶𝗼𝗻𝗮𝗹 𝗦𝘁𝗮𝘁𝗲𝗺𝗲𝗻𝘁𝘀 𝗔𝗿𝗲 𝗜𝗺𝗽𝗼𝗿𝘁𝗮𝗻𝘁 In real applications, the program must behave differently in different situations. For example: 1. Allow login only if credentials are correct 2. Apply discount only if conditions are satisfied 3. Place order only if stock is available All these decisions are handled using conditional statements. 𝗧𝘆𝗽𝗲𝘀 𝗼𝗳 𝗖𝗼𝗻𝗱𝗶𝘁𝗶𝗼𝗻𝗮𝗹 𝗦𝘁𝗮𝘁𝗲𝗺𝗲𝗻𝘁𝘀 𝗶𝗻 𝗝𝗮𝘃𝗮 𝗶𝗳 𝘀𝘁𝗮𝘁𝗲𝗺𝗲𝗻𝘁 - Used when an action needs to be performed only if a condition is true. Example use case: Check if product stock is available. 𝗶𝗳-𝗲𝗹𝘀𝗲 𝘀𝘁𝗮𝘁𝗲𝗺𝗲𝗻𝘁 - Used when there are two possible outcomes. Example use case: -If payment is successful, place order. -Else, show payment failed message. 𝗲𝗹𝘀𝗲-𝗶𝗳 𝗹𝗮𝗱𝗱𝗲𝗿 - Used when multiple conditions need to be checked one after another. Example use case: Different discount percentages based on order amount. 𝘀𝘄𝗶𝘁𝗰𝗵 𝘀𝘁𝗮𝘁𝗲𝗺𝗲𝗻𝘁 - Used when a single variable is compared against multiple fixed values. Example use case: Different order status like PLACED, SHIPPED, DELIVERED. 𝗪𝗵𝘆 𝗧𝗵𝗶𝘀 𝗧𝗼𝗽𝗶𝗰 𝗜𝘀 𝗩𝗲𝗿𝘆 𝗜𝗺𝗽𝗼𝗿𝘁𝗮𝗻𝘁 Conditional statements are used in: 1. Business logic 2. Validation 3. Decision making 4. Flow control Without clear understanding of this topic, writing real application logic becomes difficult. In my learning approach, I focus on understanding when to use which condition, not just syntax. #Java #CoreJava #ConditionalStatements #IfElse #Switch #JavaLearning #BackendDevelopment #JavaFullStack

This is the first article in a series on what developers can expect when upgrading between LTS versions of Java. In this part, we'll look at the key changes that programmers will encounter when switching from Java 8 to Java 11. https://lnkd.in/epdNUcQ3

Switch Exhaustiveness with Sealed Classes In Java In this article, we will be focusing on how sealed classes enable exhaustive switch statements, why this matters, and subtle rules that control when a switch is considered truly exhaustive https://lnkd.in/gswrpsfW #java