Java List vs Set: Ordered vs Unique Elements

ArrayList vs LinkedList in Java In Java, both ArrayList and LinkedList are part of the Collection Framework and implement the List interface. Although they serve a similar purpose, their internal working and performance differ significantly. ✅ ArrayList Uses a dynamic array internally Provides fast random access using index Slower for insertion and deletion in the middle Better when frequent data retrieval is required 🔹 Best for: Searching and accessing elements frequently ✅ LinkedList Uses a doubly linked list internally Slower random access (no direct index access like array) Faster insertion and deletion (especially in the middle) Requires more memory due to node storage 🔹 Best for: Frequent insertion and deletion operations Key Difference ArrayList → Better for read operations LinkedList → Better for write operations Choosing the right collection depends on your application requirements and performance needs. ✨ Grateful for the support and collaboration from: 🔸 Anand Kumar Buddarapu Sir 🔸 Uppugundla Sairam Sir 🔸 Saketh Kallepu Sir #Java #CoreJava #ArrayList #LinkedList #Collections #DataStructures #JavaProgramming #LearningJava

Hey Java Developers are you aware of java 25 features! 🚀 Understanding Virtual Threads in Java (Simple Explanation) Recently explored one of the most powerful features in modern Java — Virtual Threads 🧵 👉 Earlier: In traditional Java, each thread was mapped to an OS thread (1:1). So if we created 10 threads → 10 OS threads. This made threads: ❌ Heavy (memory usage) ❌ Expensive (context switching) ❌ Limited in scalability That’s why we used thread pools like: Executors.newFixedThreadPool(10) 👉 Now (Virtual Threads): Java introduces lightweight threads managed by JVM instead of OS. ✔️ Many virtual threads run on a small number of OS threads ✔️ No need to manually limit thread count ✔️ Better scalability for high-concurrency applications Example: Executors.newVirtualThreadPerTaskExecutor() 💡 In short: Old model → 1:1 (Java thread : OS thread) New model → Many : Few (Virtual threads : OS threads) 🔥 Where it helps? Microservices API calls Database operations High concurrent systems This is a game changer for backend developers working with scalable systems. #Java #SpringBoot #Microservices #BackendDevelopment #VirtualThreads #Concurrency #SoftwareEngineering #NewFeatures

Over the last few months, I've been building applications with Java after 10 years of using C# and the .NET platform. And what I've found is a language far more modern than I remembered from college and past experiences. If you haven't kept up with the news since Java 8, you need to see Java Evolved, a project spearheaded by Bruno Borges (https://lnkd.in/dvyayNiU) It acts as a visual reference guide, showing the "before" and "after" of Java code. No theory, just practice. 🔹 From: Verbose classes ➡️ To: Concise Records. 🔹 From: Error-prone switch statements ➡️ To: Safe Switch Expressions. 🔹 From: Manual casts with instanceof ➡️ To: Smart Pattern Matching. Coming from C#, it feels familiar. It's Java embracing patterns that prioritize clarity and safety, without sacrificing the robustness of its ecosystem. It's a great tool to get up to speed, guide a code review, or simply rediscover the elegance of modern Java. Check it out, and maybe even contribute. ➡️ https://lnkd.in/dBUcppBt #Java #CSharp #DotNet #SoftwareDevelopment #CleanCode #OpenSource #Developer

🚀 Mastering Core Java | Day 17 📘 Topic: ArrayList vs LinkedList in Java Today I explored the key differences between two important List implementations in Java — ArrayList and LinkedList — and when to use each effectively. 🔹 ArrayList Backed by a dynamic array Stores elements contiguously ✅ Faster random access (O(1)) ❌ Slower insertion/deletion (shifting required) 📌 Best for frequent read operations List<String> list = new ArrayList<>(); list.add("Java"); list.get(0); 🔹 LinkedList Based on a doubly linked list Elements connected via pointers ❌ Slower random access (O(n)) ✅ Faster insertion/deletion 📌 Best for frequent modifications List<String> list = new LinkedList<>(); list.add("Java"); list.remove(0); --- 🔹 When to Choose? ✔ ArrayList → Frequent reads, fewer updates ✔ LinkedList → Frequent inserts/deletes, fewer reads 💡 Key Takeaway: Choosing the right data structure like ArrayList vs LinkedList can significantly improve performance and efficiency in real-world applications. Thanks to Vaibhav Barde sir Consistently learning and strengthening my Core Java fundamentals step by step. #CoreJava #JavaCollections #ArrayList #LinkedList #JavaDeveloper #LearningJourney #DataStructures #Day17 🚀

Method Overloading in Java -> more than just same method names Method overloading allows a class to have multiple methods with the same name but different parameter lists. Java decides which method to call based on the method signature, which includes: • Number of parameters • Type of parameters • Order of parameters One important detail many people miss: Changing only the return type does not create method overloading. Why does this concept matter? Because it improves code readability and flexibility. Instead of creating different method names for similar operations, we can keep the same method name and let Java decide the correct one during compile time. That’s why method overloading is also called compile-time polymorphism. Small concepts like this form the foundation of how Java’s Object-Oriented Programming model really works. #Java #JavaProgramming #OOP #BackendDevelopment #CSFundamentals

Use "Anonymous class " to display " happy Java Class!" Here are the steps to create an anonymous class version in Eclipse: Step 1: Create a New Java Project (if not already created) Open Eclipse If you already have the project from Part 1, you can reuse it Otherwise, go to File → New → Java Project Name it "ButtonCallbackDemo" (or any name you prefer) Click Finish Step 2: Create/Ensure Required Files Make sure you already have: ClickListener.java interface Button.java class If not, create them as shown in the previous guide. Step 3: Create the Main2 Class with Anonymous Class Right-click on the src folder → New → Class Name it Main2 Check the box "public static void main(String[] args)" Click Finish Step 4: Add the Anonymous Class Code Eclipse will generate a basic class. Replace it with: java public class Main2 {    public static void main(String[] args) {        Button button = new Button();          // Anonymous class implementation        button.setClickListener(new ClickListener() {            @Override            public void onClick() {                System.out.println("Happy Java class!");            }        });          button.click();    } }

Day 8 of Java Fundamentals 🚀 Today I started learning the Java Collections Framework, which is widely used in real-world applications. 🔹 List → Ordered, allows duplicates 🔹 Set → No duplicates 🔹 Map → Stores key-value pairs Understanding collections is essential for handling data efficiently in Java applications. Excited to dive deeper into this topic 💻 #Java #LearningInPublic #JavaDeveloper #Collections

Java Insight: "Effectively final" variables Not every variable needs to final to be used in lamda. "Effectively final" - a concept introduced in java 8. A variable is effectively final if - - it is assigned only once - its value is never modified afterwards Example: int count = 5; list.forEach(item -> { System.out.println(count)}); Even though "count" is not declared as "final", Java treats it as final as its value is not changed. Advantage: - thread safety and predictable behaviour in lamda #Java #Java8 #JavaTips