What are Sealed Classes in Java 17?

🚀 Wrapping up my mini-series on Java Sealed Classes! Over the last two days, I explored what sealed classes are and how the permits keyword helps control inheritance. Today, let’s put everything together with one complete example — showing how sealed, final, and non-sealed subclasses can work in harmony. 💡 Here’s why I find sealed classes so valuable: - They bring clarity to your codebase — you instantly know all possible subclasses. - They add a layer of security and control, preventing unwanted inheritance. - They make your design cleaner and more maintainable in the long run. - And they work beautifully with pattern matching and switch expressions since the compiler knows every subclass. In short, sealed classes give Java developers the right balance between structure and flexibility — a small feature that makes a big impact on code quality. #Java #Java17 #SealedClasses #CleanCode #ProgrammingTips #OOP #CodeDesign #SoftwareDevelopment #JavaDeveloper

In Java 25, you don’t even need to write the class name, public static void main(String[] args), or System.out.println() anymore 😲 Just type: void main() { IO.println("Java 25 Version The Game Changer"); } …and it runs perfectly! 🚀 Java 25 is truly “The Game Changer.” 🔥 #Java #Java25 #Coding #Programming #Developer #JDK25 #Innovation #JavaUpdates

🚀 Top 3 Features of Java 17 🤔 Java 17 release had a productivity and performance leap. Here’s why 👇 1️⃣ SEALED CLASSES — Compile-time control over inheritance 🔹Design safe, explicit hierarchies: 🔹e.g., public sealed class Shape permits Circle, Square {} 🔹Restricts which classes can extend yours, preventing unintended subclassing. 2️⃣ TEXT BLOCKS — Multi-line literals made readable 🔹No escaping or concatenation headaches for JSON, SQL, or HTML. String query = """ SELECT * FROM users WHERE status = 'ACTIVE' """; 3️⃣ PATTERN MATCHING for instanceof — Cleaner, safer type checks 🔹Eliminates boilerplate casting and accidental errors. 🔹Before Java 17: if (obj instanceof String) { String s = (String) obj; System.out.println(s.toUpperCase()); } 🔹With Java 17 pattern matching: if (obj instanceof String s) { System.out.println(s.toUpperCase()); } 💡Java 17 also boosts G1/ZGC performance, startup speed, and native packaging — perfect for cloud-native microservices. #Java17 #JVM #Developers #Coding #Microservices #Programming #Tech

🚀 Let’s dive deeper into Java Sealed Classes: The permits keyword! Yesterday we talked about what sealed classes are and why they’re useful. Today, we’ll explore how to control inheritance using permits. What is permits? The permits keyword specifies exactly which classes are allowed to extend a sealed class. This ensures the hierarchy is strictly controlled and prevents unexpected or unwanted subclassing. Important Rule: Any class listed in the permits clause must be declared as one of the following: - final → cannot be subclassed further - sealed → can have its own limited set of subclasses - non-sealed → removes the restriction, allowing open inheritance ✅ Key takeaway: The permits keyword combined with final, sealed, or non-sealed lets you design safe, predictable, and maintainable class hierarchies. #Java #Java17 #SealedClasses #PermitsKeyword #OOP #CleanCode #ProgrammingTips #SoftwareDevelopment

Access Modifiers in Java — A Core Concept Every Developer Should Know Strengthening my Java fundamentals by revisiting Access Modifiers, one of the key building blocks for writing secure and well-structured code. ✔ private – Accessible only within the class ✔ default – Accessible within the same package ✔ protected – Accessible within the same package + subclasses (even across packages) ✔ public – Accessible from anywhere A clear understanding of these modifiers helps in building better class designs, improving encapsulation, and preparing for advanced concepts like OOP, Collections, Advanced Java, and Spring Boot. Thanks to my mentor Anand Kumar Buddarapu #Java #Programming #LearningJourney #JavaDeveloper #AccessModifiers #CleanCode

//Unlearn & Relearn “Can _ and $ be used as variable names?” 🔹 _ cannot be used as an identifier in Java 8 and above. It became a reserved keyword to avoid confusion and to support future language features. ex: int _ = 10; // Not allowed in modern Java 🔹 $ can still be used as an identifier, but it’s strongly discouraged: int $ = 100; // Valid but not recommended The $ symbol is commonly used by the compiler for things like inner classes and generated code, so using it in real projects reduces clarity. Remember: $ → Allowed, but avoid using it _ → Not allowed as a standalone identifier (Java 8+)

⁉️Say goodbye to boilerplate code! If you're still writing bulky anonymous inner classes in Java, it's time to level up. The introduction of Functional Interfaces and Lambda Expressions in Java 8 was a game-changer. Q. Why do they matter? 1. Cleaner, more readable code: Write concise and expressive code by representing an interface with a single abstract method. 2. Enables functional programming: Pass behavior as arguments, unlocking powerful features like the Stream API. 3. Reduces overhead: More lightweight than traditional inner classes, leading to better performance and smaller application footprints. Consider the classic Runnable example: java // Old way Thread t = new Thread(new Runnable() { public void run() { System.out.println("Classic Java"); } }); // Modern way with a lambda Thread t = new Thread(() -> System.out.println("Modern Java")); Use code with caution. This change isn't just cosmetic—it unlocks a more powerful and modern approach to Java development. 🫠What's your favorite use-case for lambdas or the Stream API? Share your thoughts below! #Java #Java8 #Programming #CleanCode #DeveloperTips #SoftwareDevelopment

Deadlock in Java A Deadlock happens when two or more threads are blocked forever — waiting for each other’s resources. This usually occurs when each thread holds a lock and is waiting for another lock to be released. Example scenario: Thread A has Lock1 and waiting for Lock2 Thread B has Lock2 and waiting for Lock1 Both are stuck → this is DEADLOCK ❌ Why it happens? Because of circular dependency between threads. How to prevent it? Always acquire locks in same order Use tryLock() (ReentrantLock) Minimize synchronized blocks Avoid nested locks Conclusion Deadlocks can freeze your entire application. As developers, we must design our locking strategy carefully in multithreading to avoid such situations. #Java #Multithreading #Deadlock #ThreadLifeCycle #JavaDeveloper #LearningJourney #100DaysOfCode #TapAcademy 🚀

Skimmed this handy roundup of Java 25—and it’s a strong LTS jump for everyday coding. Record patterns, sequenced collections, and (preview) string templates clean up routine code, while module import declarations + compact source files cut boilerplate; on the runtime side, structured concurrency, scoped values, and new JFR profiling round out the upgrade. If you’re still on 21 LTS, which feature would tip you to 25 first? #womenwhocode #softwaredeveloper #softwareengineer https://lnkd.in/ep_8qpP3

🚀 Just published my Java AST Parser Package! 🚀 I'm excited to share my latest open-source contribution - a powerful Java Abstract Syntax Tree (AST) parser that makes it easier to analyze and process Java source code programmatically. 📦 npm Package and Docs : (npm i java-ast-parser) 👇 https://lnkd.in/g-q6tG-z 📦 Check it out on GitHub: 👇 https://lnkd.in/gmxAGJvB Note:- I'd love your feedback and contributions! If you find this useful, please consider: ⭐ Starring the repo 🔍 Opening issues for bugs/feature requests 💡 Submitting PRs for improvements #Java #AST #OpenSource #Programming #DeveloperTools #CodeAnalysis #JavaDevelopment #GitHub