Java Memory Management: Heap vs Stack Explained

Exploring the Heart of Java: Object Class Methods 💡 Every class in Java inherits from the Object class — the true parent of all! It defines 9 powerful methods that shape how objects behave 👇 ✨ getClass() → reveals runtime class info ✨ hashCode() → unique object identifier ✨ equals() → compares objects meaningfully ✨ clone() → duplicates an object ✨ toString() → turns object into readable text ✨ wait(), notify(), notifyAll() → manage thread communication resource from : Oracle These methods may look simple, but they’re the foundation for polymorphism, comparison, and synchronization in Java. #Java #OOPs #LearningJourney #FullStackDeveloper #ObjectClass #JavaProgramming

Day 20: Exploring Java Interfaces with Static, Private, and Public Methods 🧑💻 Today I practiced Java interfaces and learned: Static methods – Called using the interface name (Calculator.add(...)) Private methods – Used inside the interface to support other methods Public methods – Implemented in the class (multiply(...)) Example: int sum = Calculator.add(5, 10); SimpleCalculator calc = new SimpleCalculator(); int product = calc.multiply(5, 10); 💡 Key takeaway: Interfaces in Java can now have static, private, and default methods, making code modular and reusable. ✅ Note: Before Java 1.8, interfaces could only have abstract methods. From Java 1.8, default and static methods were introduced. From Java 1.9, private methods in interfaces became possible to help reuse code inside the interface. 10000 Coders #Java #Interface #OOps #LearningEveryDay #100DaysOfCode #Day20 #CodingJourney

🌠𝐔𝐧𝐝𝐞𝐫𝐬𝐭𝐚𝐧𝐝𝐢𝐧𝐠 𝐩𝐮𝐛𝐥𝐢𝐜 𝐬𝐭𝐚𝐭𝐢𝐜 𝐯𝐨𝐢𝐝 𝐦𝐚𝐢𝐧(𝐒𝐭𝐫𝐢𝐧𝐠[] 𝐚𝐫𝐠𝐬) 𝐢𝐧 𝐉𝐚𝐯𝐚: The line public static void main(String[] args) is the entry point for every standalone Java program. When you run a Java application, this is the method where the Java Virtual Machine (JVM) starts program execution. Let's break down each part so you understand why it is written exactly this way: 󠁯⤷ 𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭 𝐁𝐫𝐞𝐚𝐤𝐝𝐨𝐰𝐧: ⬩ 𝐩𝐮𝐛𝐥𝐢𝐜 ➜ This makes the method accessible to the Java runtime from outside the class. If it were not public, the JVM could not start your program. ⬩ 𝐬𝐭𝐚𝐭𝐢𝐜 ➜ Static means the method belongs to the class itself, not to an object. The JVM needs to call it without creating a class object. This is crucial — remember, before your program starts, there is no object to call methods on. ⬩ 𝐯𝐨𝐢𝐝 ➜ The method does not return a value to the JVM. ⬩ 𝐦𝐚𝐢𝐧 ➜ This is the special name Java expects for the entry method. If you spell it differently, the JVM won't recognize or run your code. ⬩ 𝐒𝐭𝐫𝐢𝐧𝐠 [] 𝐚𝐫𝐠𝐬 ➜ This parameter lets you pass information (command-line arguments) to your program from outside when you run it. Each argument (if any) will be a string in this array. #Corejava #JavaBasics #Java Codegnan Support Team Codegnan Thanks to my mentor: Anand Kumar Buddarapu Saketh Kallepu Uppugundla Sairam

I recently implemented Virtual Threads in Java — a new feature that makes handling multiple tasks faster and easier! In simple terms, virtual threads are lightweight threads that let your program do many things at the same time without slowing down your system. Instead of each thread using a lot of system memory (like traditional ones), virtual threads are super efficient — you can create thousands of them with little overhead.This feature made my application more scalable and responsive, especially when dealing with tasks like API calls or database queries that usually wait for input/output. Here’s what I learned:Virtual Threads make concurrency easier — no need for complex async code. Perfect for I/O‑heavy tasks (network calls, database operations). Simple to use with the new Java APIs (Thread.ofVirtual(), Executors.newVirtualThreadPerTaskExecutor()). Loving how Java keeps evolving to make developers’ lives simpler! 🚀 #Java #VirtualThreads #LearningByDoing

Today, I learned about the final keyword in Java and how it helps maintain data integrity and design consistency in applications. final Variable: Value can’t be changed once assigned final Method: Cannot be overridden final Class: Cannot be inherited Understanding these fundamentals is essential in writing secure, optimized, and predictable Java code ✅ #Java #OOP #LearningJourney #SoftwareDevelopment

💻 public static void main(String[] args) 🌟 Every Java application needs a starting line, and that's precisely what the public static void main(String[] args) method is! Think of it as the main switch 💡 that the Java Virtual Machine (JVM) flips to kick off your program's execution. Without it, your code is just a collection of instructions with no starting point! Here is a spotlight on each component's vital role: • public 🔓: This is an access modifier. It makes the method accessible from anywhere, including outside the class. The JVM needs to call this method to start your program, so it must be publicly accessible. • static 🏛️: This keyword means the method belongs to the class itself, rather than any specific object of that class. This is crucial because it allows the JVM to call the main method directly without having to first create an instance (object) of the class. • void 🛑: This specifies the return type is empty. The main method does not return any value. Once the program's execution within this method is complete, the program simply terminates. • main 🎯: This is the standard, recognized name for the entry point method in Java. The JVM specifically looks for a method named main to begin execution. Don't change this name! • (String[] args) 🗣️: This declares a parameter that is an array of String objects. This array is how your program receives command-line arguments that users can pass to the Java program when it's executed. #Java #Programming #JDK #JRE #JVM #CoreJava Codegnan Anand Kumar Buddarapu

☕ Revisiting Java Core Concepts Today, I explored some of the core fundamentals of Java that every developer should understand clearly. 💡 Currently, I’m following the sessions by Faisal Memon, and his explanations are helping me strengthen my understanding of Java step by step. 🙌 For those revising or learning Java — here’s a quick recap 👇 🔹 JDK, JRE, and JVM — understanding how a Java program actually runs: ➡️ It all starts with a .java file (your source code). ➡️ Using the javac compiler (part of the JDK), the source code is compiled into a .class file, which contains bytecode. ➡️ This bytecode is platform-independent, meaning it can run on any system — “Write Once, Run Anywhere.” ➡️ The JRE (Java Runtime Environment) is used to run this .class (bytecode) file. It provides the necessary libraries and runtime environment. ➡️ Inside the JRE, the JVM (Java Virtual Machine) executes the bytecode, converting it into machine code, and finally produces the output on screen. 🔹 Java 25 (LTS) — the latest Long-Term Support version, focused on performance, reliability, and modern Java enhancements. 🔹 Variables and Constants — • Variables can change during program execution. • Constants are declared using the final keyword to prevent modification. 🔹 Comments in Java — improving code readability and documentation: • Single-line → // • Multi-line → /* ... */ • JavaDoc → /** ... */ used for generating documentation. Understanding this complete flow — from writing code to seeing output — really strengthened my grasp of how Java works under the hood. 🚀 #Java #JDK #JRE #JVM #Java25 #Programming #Learning #Developers #CodingJourney #FaisalMemon #LearningJourney

📌 Today's Focus: Static & Non-Static Blocks in Java ⚙️ Here’s what I explored today 👇 🧠 Understanding Blocks in Java: 🔹 Static Block: Runs only once when the class is loaded into memory. 🔹 Non-Static (Instance) Block: Runs every time an object is created. 🔍 Code Flow (From My Notes): 1️⃣ When the program starts → static block executes automatically. 2️⃣ Each time new StaticDemo() is created → non-static block executes. 3️⃣ Static blocks are ideal for initialization tasks (like setting up config or loading resources). 🧩 Execution Order Example: Class loads → static block called Object 1 created → non-static block called Object 2 created → non-static block called 🎯 Key Learning: Static blocks execute once per class, Non-static blocks execute once per object. #Java #StaticBlock #NonStaticBlock #JavaBasics #OOP #JVM #DailyJava #DeveloperJourney #CodeEveryday Anand Kumar Buddarapu

⚙️ Java Thread Pools: Reuse Threads, Boost Performance Creating and destroying threads repeatedly can slow your program down that’s where thread pools come in. They manage threads efficiently, keeping your system fast and stable even under heavy workloads. Here’s what this guide covers: ▪️ What Is a Thread Pool? → A collection of pre-created threads ready to execute multiple tasks, managed by the Executor Framework. ▪️ Why Use Thread Pools? → Boost performance, control active threads, and prevent system overload — perfect for servers and schedulers. ▪️ Executor Framework → Simplifies thread management with ExecutorService. Use execute() or submit() to assign tasks easily. ▪️ Creating a Thread Pool → Use Executors.newFixedThreadPool(), newCachedThreadPool(), or newScheduledThreadPool() depending on your needs. ▪️ Types of Thread Pools → Fixed, Cached, Single, and Scheduled — each designed for a different workload pattern. ▪️ Shutting Down Safely → Always call shutdown() to avoid resource leaks and ensure clean task completion. ▪️ Best Practices → Pick the right pool, use bounded queues, and handle exceptions gracefully. ▪️ Interview Q&A → Understand ExecutorService, lifecycle methods, and how to manage thread lifecycle effectively. 📌 Like, Save & Follow CRIO.DO for real-world Java concepts simplified. 💻 Learn Java the Crio Way At CRIO.DO, you’ll build backend systems that use ExecutorService, concurrency models, and thread pools exactly how modern applications run. 🚀 Start your FREE trial today - https://lnkd.in/gzGCCUkZ and learn by doing, not memorizing. #Java #Multithreading #ExecutorService #ThreadPool #Concurrency #CrioDo #BackendEngineering #LearnCoding #JavaInterview #SoftwareDevelopment

🚀 #Day56 of My Java Journey Today, I learned about Static Blocks and Non-Static (Instance) Blocks in Java. 𝟏. 𝐒𝐭𝐚𝐭𝐢𝐜 𝐁𝐥𝐨𝐜𝐤: ➜ Declared using the static keyword. 𝑺𝒚𝒏𝒕𝒂𝒙: static{ //statements } ➜ A static block runs only once, when the class is loaded into memory ➜ Executes before main method ➜ Mainly used for initializing static variables ➜ Static block executes only once per class loading, even if multiple objects are created. 𝟐. 𝐍𝐨𝐧-𝐒𝐭𝐚𝐭𝐢𝐜 / 𝐈𝐧𝐬𝐭𝐚𝐧𝐜𝐞 𝐁𝐥𝐨𝐜𝐤: ➜ No keyword 𝑺𝒚𝒏𝒕𝒂𝒙: { //statements } ➜ A non-static block runs each time an object is created. ➜ It executes just before the constructor. 𝙀𝙭𝙚𝙘𝙪𝙩𝙞𝙤𝙣 𝙁𝙡𝙤𝙬: Static Block → main() → Non-Static Block → Constructor 10000 Coders #Java #OOP #BlocksInJava #StaticBlock #InstanceBlock #LearningJourney #CodingEveryday #JavaProgramming