Java WatchService for Real-Time File System Monitoring

# Executor Service in Java * What is ExecutorService? ExecutorService is a framework to manage and control thread execution. You don’t create threads manually… it manages them for you. ⸻ * Why use it? Without it → manual thread handling 😓 With it → controlled & reusable threads ⸻ * What can it do? ✔ Manage thread pool ✔ Execute tasks asynchronously ✔ Improve performance ⸻ * Common Types: • FixedThreadPool • CachedThreadPool • SingleThreadExecutor ⸻ * Simple Flow: 1. Submit task 2. Thread executes 3. Result returned #Java #ExecutorService #Multithreading #BackendDevelopment #Programming

Day 10 of Java I/O Journey Today I wrapped up core concepts with File Handling in Java 📂 🔹 Basic File Operations • Open → Access the file • Read → Get data from file • Write → Store data in file • Delete → Remove file when needed 🔹 Important Classes • File → Manage file & directory properties • Scanner → Read file content easily • FileInputStream / FileOutputStream → Handle binary data • FileReader / FileWriter → Handle text data 🔹 Key Learnings ✔ Always handle exceptions (IOException) ✔ Close files properly to avoid memory leaks ✔ Check file path & permissions before operations 💡 Now I can confidently read, write, and manage files in Java. From basics to real-world concepts — progress feels real now ⚡ What’s your go-to approach for file handling in Java? #Java #JavaIO #Programming #Coding #SoftwareDevelopment #Developers #LearningInPublic #100DaysOfCode #CodingJourney #JavaDeveloper #BackendDevelopment #TechSkills #Hariom #HariomKumar #Hariomcse

Day 8 of Java I/O Journey Today I explored Network Communication in Java 🌐 🔹 Socket → Connects a client to a server 🔹 ServerSocket → Listens and accepts client connections 💡 This is how real-world applications communicate over networks — from chat apps to web services. Learning how systems talk to each other is a big step forward Slowly moving from basics to real-world concepts! Have you ever built a client-server app in Java? #Java #LearningInPublic #100DaysOfCode #Programming #JavaIO #CodingJourney #Developers #Consistency #Hariom #HariomKumar #Hariomcse

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

Day 12 of Java I/O Journey Today I explored Serialization & Deserialization in Java 🔄 🔹 Serialization • Converts object → byte stream • Used to store or transfer objects • Uses ObjectOutputStream 🔹 Deserialization • Converts byte stream → object • Restores saved data • Uses ObjectInputStream 🔹 Key Concepts • Serializable → Marker interface to allow object serialization • serialVersionUID → Maintains version consistency • transient → Prevents sensitive data from being serialized 🔹 Best Practices ✔ Always define serialVersionUID ✔ Use transient for sensitive fields (like passwords) ✔ Customize with writeObject() and readObject() when needed 💡 This concept is powerful for saving objects and transferring data between systems. From understanding data flow to handling objects efficiently — learning is getting deeper every day ⚡ Have you ever used serialization in a real project? #Java #JavaIO #Programming #Coding #SoftwareDevelopment #Developers #LearningInPublic #100DaysOfCode #CodingJourney #JavaDeveloper #BackendDevelopment #TechSkills #Hariom #HariomKumar #Hariomcse

### Java Learning ### 👉 11/100 Today, I worked on a Java Multithreading program implementing the Producer-Consumer concept using: ✔️ Threads ✔️ Runnable Interface ✔️ Synchronization ✔️ wait() and notify() methods ✔️ Shared StringBuffer for thread communication 🚀 What the program does: The Producer thread generates data and stores it in a StringBuffer The Consumer thread waits until the Producer completes execution After notification, the Consumer accesses and prints the produced data 💡 Key Concepts Practiced: 🔹 Thread creation using Runnable 🔹 Inter-thread communication in Java 🔹 Use of synchronized block for safe shared resource access 🔹 Coordination between Producer and Consumer threads 🔹 Basics of concurrency handling in Java 📚 What I learned: This project helped me understand how multiple threads can communicate and work together safely using Java’s built-in synchronization mechanisms. Multithreading is one of the most important concepts in Java, especially for building efficient and real-world applications. #Java #Multithreading #ProducerConsumer #ThreadCommunication #Synchronization #CoreJava #JavaProgramming #CodingJourney #JavaDeveloper #LearningByDoing #100DaysOfCode 10000 Coders Raviteja T Mohammed Abdul Rahman

Day 11 of Java I/O Journey Today I focused on Exception Handling in Java ⚠️ 🔹 Types of Exceptions • Checked Exceptions → Handled at compile time (e.g., IOException, SQLException) • Unchecked Exceptions → Occur at runtime (e.g., NullPointerException, ArrayIndexOutOfBoundsException) 🔹 Key Keywords • try → Wrap code that may cause an exception • catch → Handle specific exceptions • finally → Executes important code (always runs) 🔹 What I Learned ✔ Use multiple catch blocks for different exceptions ✔ Always log errors for better debugging ✔ Create custom exceptions for cleaner and more meaningful code 💡 Exception handling makes your program more robust and reliable. Learning not just to write code, but to handle errors like a pro ⚡ How do you usually handle exceptions in your projects? #Java #JavaIO #Programming #Coding #SoftwareDevelopment #Developers #LearningInPublic #100DaysOfCode #CodingJourney #JavaDeveloper #BackendDevelopment #TechSkills #Hariom #HariomKumar #Hariomcse

🚀 Java Evolution: Java 8 → Java 25 (Latest LTS) Here’s a crisp comparison 👇 🔥 Big Shift Over Time Java 8 → Functional programming begins Java 17 → Clean, expressive code (Records, Sealed) Java 21 → Concurrency revolution (Virtual Threads) Java 25 → 🧠 Performance + simplicity + production-ready modern Java #Java #Backend #SoftwareEngineering #SystemDesign #Programming #Developers #TechEvolution

Day 5 of Java I/O Journey Today I explored Handling Files in Java 📂 🔹 File → Represents files and directories 🔹 FileInputStream → Reads data from files 🔹 FileOutputStream → Writes data to files 🔹 FileWriter → Writes text/characters Understanding file handling is crucial for building real-world applications where data needs to be stored and retrieved efficiently. Learning step by step, growing every day 💡 What’s your go-to way for handling files in Java? #Java #LearningInPublic #100DaysOfCode #Programming #JavaIO #CodingJourney #Developers #Consistency #Hariom #HariomKumar #Hariomcse

🚀 **Day 8 of My DSA Journey in Java** Today important concepts that every Java developer should know: 🔹 **Taking User Input in Java** Learned how to use the `Scanner` class to take input from users. Explored different methods like `nextInt()`, `nextFloat()`, `nextBoolean()`, and more to handle various data types. Also understood the importance of closing the scanner using `.close()` to prevent resource leaks. 🔹 **Java Garbage Collector** Understood how memory management works in Java. Objects created using the `new` keyword are stored in the heap memory, and Java automatically removes unused objects using the Garbage Collector. This eliminates the need for manual memory management (unlike C++) and helps avoid memory leaks. 💡 **Key Takeaway:** Java simplifies memory management and provides powerful tools for handling user input efficiently. #Java #DSA #LearningInPublic #Programming #105DaysOfCode #JavaDeveloper