🚨 Understanding "Thread.sleep()" in Java Multithreading When working with multithreading, it’s Thread.sleep() only pauses the current thread for a specific time.It does NOT guarantee execution order between threads. Even if you write code like this: ➡ Start Thread 1 ➡ Pause using Thread.sleep() ➡ Start Thread 2 There is no guarantee that Thread 1 will complete before Thread 2 starts. Why? Because the JVM thread scheduler decides which thread runs first, not sleep(). ✔ Thread.sleep() → Only pauses the current thread ✔ It does NOT coordinate threads ✔ It does NOT ensure execution sequence So what should we use instead? ✅ join() – Wait for a thread to finish ✅ synchronized – Protect shared resources ✅ ReentrantLock – Advanced locking control ✅ ExecutorService – Efficient thread pool management 💡 Key takeaway:Multithreading is not just about creating threads — it's about managing thread coordination correctly. Incorrect synchronization is one of the most common causes of production bugs in concurrent systems. #Java #JavaDeveloper #JavaProgramming #JavaConcurrency #Multithreading #Spring #SpringBoot #SpringFramework #SpringBootDeveloper #BackendDevelopment #BackendDeveloper #SoftwareEngineering #Microservices #RESTAPI #APIDevelopment #JVM #JavaCommunity #Coding #Programming #TechLearning #DeveloperCommunity #100DaysOfCode
Java Multithreading: Understanding Thread.sleep() Limitations
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Understanding Java Class Loading & Memory Areas Today, I learned how Java manages memory during Class Loading. It helped me understand what happens behind the scenes when a program runs. Simple Example: class Demo { static int x = 10; // Stored in Method/Class Area void show() { int y = 5; // Stored in Stack System.out.println(x + y); } } public class Main { public static void main(String[] args) { Demo obj = new Demo(); // Object stored in Heap obj.show(); } } **When this program runs: 1.Class is loaded into Method Area 2.Static variable (x) is initialized once 3.Object (obj) is created in Heap 4.Method execution happens in Stack #Java #Programming #LearningJourney #SDLC #Coding #Developer #CareerGrowth
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🚀 Why Runnable is Preferred Over Thread in Java? Many beginners start with extending the Thread class, but in real-world development, Runnable (or lambda) is the preferred approach. Let’s understand why 👇 🔹 Problem with Thread Class Java supports single inheritance. 👉 If you write: class A extends Thread ❌ You cannot extend any other class 🔹 Real-Time Scenario class A extends B 👉 Now you want threading also… ❌ You CANNOT do: class A extends B, Thread // Not possible 🔹 Solution: Use Runnable(Functional Interface)✅ class A extends B implements Runnable { public void run() { System.out.println("Running"); } } 👉 Now you can: ✔ Extend another class ✔ Use threading ✔ Follow clean design 🔹 Why Runnable is Better? ✔ Supports flexibility ✔ Follows good design (separates task & thread) ✔ Works with modern APIs (ExecutorService, ThreadPool) ✔ Supports lambda expressions 🎯 Key Takeaway 👉 “Since Java supports single inheritance, we use Runnable instead of extending Thread to achieve better flexibility and design.” #Java #Multithreading #JavaDeveloper #Coding #SoftwareEngineering #Learning
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Understanding the foundation is key. The main() method in Java is more than just a starting point—it's the bridge between the operating system and your program. Without it, execution simply doesn’t begin. Grasping concepts like public, static, and void not only helps you write code, but also understand how Java actually runs behind the scenes. Every expert was once a beginner who chose to understand the basics deeply. 💡 #Java #JVM #ProgrammingFundamentals #SoftwareEngineering #BackendDevelopment #ComputerScience #TapAcademy #Developers 🚀
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Looks simple… but Java has its own logic 🧠 Two strings. Same value. Still not equal? 🤔 That’s where most developers get confused ⚠️ In Java, it’s not just about what you see… It’s about how it’s created internally If you understand this concept, you’re already ahead of many developers 🚀 🚨 Stop just watching tutorials… Real growth = Practice + Consistency 💯 🔥 Java Daily Practice ☕️ 👉 Join & start today 🔗 https://lnkd.in/gfhqgjGd 🚀 💬 What do you think the output will be? #Java #Debugging #Programming #BackendDeveloper #Coding #TechLearning
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Any kind of handshake to control program flow with threads is extremely expensive, error prone, and just plain wrong. Use wait()/notify(). Threads should be used to appropriate and organize work loads. Theoretically you could use one thread/process for your entire program. Would be extremely hard to organize and completely procedural but it's been done and is still done for some embedded systems to optimize performance, any time you need another thread requires synchronization locks which is execution time completely wasted.