Java 25 Features: Understanding Virtual Threads

Java interrupts : In Java, there is no safe way to forcibly terminate a thread. Instead, Java uses a cooperative interruption mechanism. When Thread 1 (the main thread) decides that Thread 2 is no longer needed—perhaps because the data was found in a cache—it sends an interruption signal to Thread 2. Because this is cooperative, Thread 2 is not forced to stop immediately; rather, it must periodically check its own "interrupted status" and choose to shut down gracefully. Therefore, if Thread 2 is poorly written and ignores these signals, it may continue running indefinitely. Example: public static void main(String[] args) { // start the thread Thread taskThread = new Thread(new Task()); taskThread.start(); taskThread.interrupt(); // some reason System.out.println("Asking to stop"); } The reason of why interrupt method does not called immediately because of : data integrity Opne connections Or some half operation #Java #BackendDevelopment #SoftwareEngineering #MultiThreading #Concurrency #JavaPerformance #CodingTips #Programming #SystemDesign

Today while revising Core Java, I came across a small but interesting concept Anonymous Object ✅ class AnonymousObject { public void AnonymousObj() { System.out.println("Anonymous object practice"); } AnonymousObject() { System.out.println("In constructor"); } } public class Main { public static void main(String[] args) { new AnonymousObject().AnonymousObj(); new AnonymousObject().AnonymousObj(); } } Every time new AnonymousObject() is used, a new object is created and the constructor gets called. Simple concept, but clarity matters. 😊 #Java #CoreJava #Learning

🚀 Runnable vs Callable in Java Concurrency — Quick Notes Both Runnable and Callable are Functional Interfaces ✅ 👉 That means you can use Lambda Expressions with them (Java 8+) 🔹 Runnable (Java 1.0) * Functional Interface ✔️ * Method: run() * Return Type: ❌ No return value * Exception Handling: ❌ Cannot throw checked exceptions * Use Case: Fire-and-forget background tasks 🔹 Callable (Java 5.0) * Functional Interface ✔️ * Method: call() * Return Type: ✅ Returns result (Future<V>) * Exception Handling: ✅ Can throw checked exceptions * Use Case: Tasks that need results or error handling 💡 Key Difference * Use Runnable when you don’t care about the result * Use Callable when you need a result or better exception handling ⚡ Lambda Example Runnable r = () -> System.out.println("Running task"); Callable<Integer> c = () -> 10 + 20; 🔥 In modern Java (Java 8+ to Java 21 Virtual Threads), functional style + concurrency = clean & scalable code. #Java #Concurrency #Multithreading #FunctionalProgramming #JavaDeveloper #InterviewPrep

Most Java developers use primitives. But very few actually understand when NOT to use them. Here’s the truth 👇 In Java, "int", "double", "boolean" are primitives. They are: • Fast • Memory efficient • Simple But they come with hidden limitations: ❌ Cannot be "null" ❌ No built-in methods ❌ Not usable in Collections ("List<int>" won’t work) Now comes the powerful alternative: Wrapper Classes "Integer", "Double", "Boolean"... They bring: ✅ Null support ✅ Built-in utility methods ✅ Full compatibility with Collections & Generics So what’s the real rule? → Use primitives for performance-critical logic → Use wrappers when working with APIs, forms, or collections The difference looks small. But in real-world applications, it changes everything. #Java #Programming #BackendDevelopment #JavaDeveloper #CleanCode

Unlock the power of Java Access Modifiers. Discover how these tools shape visibility in your code. Essential insights in a concise guide.

The Foreign Function & Memory API in Java provides significantly easier access to functions in C libraries than the outdated JNI.

The Foreign Function & Memory API in Java provides significantly easier access to functions in C libraries than the outdated JNI.

🚀 Java Multithreading Simplified Multithreading is one of the most powerful features of Java, allowing applications to execute multiple tasks concurrently — improving performance, responsiveness, and overall efficiency. In modern software systems, multithreading is not just an optimization technique; it is a necessity. From handling thousands of web requests to processing background jobs and real-time data, threads play a crucial role behind the scenes. 🔍 What this covers This infographic provides a quick overview of: 🔹 What multithreading is and how it works 🔹 Why it is essential in modern applications 🔹 The thread lifecycle (New → Runnable → Running → Waiting → Terminated) 🔹 Different ways to create threads in Java (Thread vs Runnable) 🔹 Real-world use cases and key advantages ⚙️ Where multithreading is used • Web servers handling multiple client requests • Background processing (emails, notifications, batch jobs) • Real-time systems and streaming applications • High-performance enterprise applications 🧠 Key takeaway While creating threads in Java is relatively straightforward, managing them efficiently is where real expertise comes in. Concepts like synchronization, thread safety, and resource management are critical to avoid issues such as: • Race conditions • Deadlocks • Thread starvation 🚀 Best practice In production systems, it is recommended to use ExecutorService and thread pools instead of creating threads manually. This approach ensures better control, scalability, and optimal resource utilization. #Java #Multithreading #Concurrency #BackendDevelopment #SoftwareEngineering #SystemDesign #Developers #Programming #LearningJourney

Day 14 of Java I/O Journey Today I explored File Handling Methods in Java 📂 Understanding how Java manages files is essential for building real-world applications. 🔹 Important Methods • File.exists() → Checks whether a file or directory exists • File.createNewFile() → Creates a new file • File.delete() → Deletes a file or directory 🔹 Common Exceptions • FileNotFoundException → When the specified file path is invalid • IOException → General file operation errors • SecurityException → When access permission is denied 🔹 Key Takeaways ✔ Always check if a file exists before operations ✔ Handle exceptions properly to avoid runtime issues ✔ Close streams after file operations ✔ Validate permissions before reading or writing files 💡 File handling is not just about reading and writing — it’s about safely managing resources and preventing errors. Every day I’m moving one step closer to mastering Java fundamentals ⚡ What file handling methods do you use most often in Java? #Java #JavaIO #Programming #Coding #SoftwareDevelopment #Developers #LearningInPublic #100DaysOfCode #CodingJourney #JavaDeveloper #BackendDevelopment #TechSkills #Hariom #HariomKumar #Hariomcse

💡 Multithreading in Java — What I Learned in Real Projects At first, I thought multithreading was just about running tasks in parallel. But in real-world applications, it’s much more than that. ➡️ It’s about managing shared resources safely ➡️ It’s about avoiding race conditions ➡️ It’s about designing scalable systems Example: ExecutorService executor = Executors.newFixedThreadPool(5); for (int i = 0; i < 10; i++) { executor.submit(() -> { System.out.println(Thread.currentThread().getName()); }); } executor.shutdown(); ✨ What I learned: ✔ Thread pools are better than manual threads ✔ Synchronization is critical when data is shared ✔ Debugging concurrency issues is not easy 😅 ⚠️ Mistakes I made: - Ignoring thread safety initially - Creating too many threads - Not handling shutdown properly Multithreading is powerful — but only when used carefully. #Java #Multithreading #Concurrency #SoftwareEngineering #BackendDevelopment #LearningJourney