Java Static vs Non-Static Execution Order

☕ Java Core Concepts – Interview Question 📌 What is Runtime (Dynamic) Polymorphism? In Java, Runtime Polymorphism (also called Dynamic Method Dispatch) is a concept where the method to be executed is determined at runtime, not at compile time. 🔹 Key Points: ✔ Achieved through Method Overriding ✔ Method call is resolved during execution ✔ Depends on the object type, not reference type 🔹 How it Works: • A parent class reference points to a child class object • The overridden method in the child class is executed 🔹 Why it’s Important: ✔ Enables flexibility and extensibility ✔ Supports runtime decision making ✔ Improves code reusability 💡 In Short: Runtime polymorphism allows Java to decide which method to call at runtime, based on the actual object, enabling dynamic behavior in applications. 👉For Java Course Details  Visit :https://lnkd.in/gwBnvJPR . #Java #CoreJava #Polymorphism #JavaInterview #Programming #Coding #TechSkills

Ever wondered what happens internally when a Java class gets loaded? 🤔 When a class is used for the first time, JVM follows a fixed sequence: 1️⃣ Static Variable Initialization 2️⃣ Static Block Execution 3️⃣ Class Becomes Ready And when an object is created: 4️⃣ Instance Variable Initialization 5️⃣ Instance Block Execution 6️⃣ Constructor Execution So the actual flow looks like this: Static Variable → Static Block → Instance Variable → Instance Block → Constructor Important points: Static blocks run only once when the class is loaded Constructors run every time an object is created Static methods can be called without creating an object Non-static methods require an object This is one of the most commonly asked concepts in Java interviews. #Java #JVM #JavaDeveloper #Programming #Coding #SoftwareEngineer #BackendDevelopment #JavaInterview #Developers

📒 Day 29 of Java | Binding says, “I know who to call,” while static methods in method hiding are like twins — same name, different behavior. Today I learned about binding in Java, which refers to the process of linking a method call with its method body. 👉 There are two types of binding: ➲ Static Binding: The method call is resolved at compile time. It is used for method overloading, private methods, final methods, and static methods. ➲ Dynamic Binding: The method call is resolved at runtime. It is mainly used for method overriding and supports runtime polymorphism. 👉 I also learned about method hiding in Java. When a subclass defines a static method with the same signature as a static method in the parent class, it is called method hiding. These concepts made Java’s method handling feel even more interesting. #Java #CoreJava #Programming #Coding #ObjectOrientedProgramming #LearnInPublic #100DaysOfCode #DeveloperJourney #SoftwareDeveloper #BuildInPublic #StudentDeveloper #TechStudents

Java is called an object-oriented language… but that’s not entirely true. Here’s the Truth 👇 🔹 Not everything in Java is an object Primitive types like int, char, double exist outside OOP 🔹 Static breaks pure OOP Static methods and variables belong to the class, not objects 🔹 You can write Java without creating a single object (main method is static for a reason) So no, Java is not 100% object-oriented. #Java #Programming #OOP #SoftwareDevelopment #Coding

Stop being confused by Java Collections. Here's the whole picture in 30 seconds 👇 Most developers use ArrayList for everything. But Java gives you a powerful toolkit — if you know when to use what. 📋 LIST — When ORDER matters & duplicates are OK ArrayList → Fast reads ⚡ LinkedList → Fast inserts/deletes 🔁 🔷 SET — When UNIQUENESS matters HashSet → Fastest, no order LinkedHashSet → Insertion order TreeSet → Sorted order 📊 🔁 QUEUE — When the SEQUENCE of processing matters PriorityQueue → Process by priority ArrayDeque → Fast stack/queue ops 🗺️ MAP — When KEY-VALUE pairs matter HashMap → Fastest lookups 🔑 LinkedHashMap → Preserves insertion order TreeMap → Sorted by keys 🧠 Quick Decision Rule: Need duplicates? → List Need uniqueness? → Set Need FIFO/Priority? → Queue Need key-value? → Map The right collection = cleaner code + better performance. 🚀 Save this. Share it with a dev who still uses ArrayList for everything. 😄 #Java #Collections #Programming #SoftwareDevelopment #100DaysOfCode #JavaDeveloper #Coding #TechEducation #SDET

🚀 Java Practice: Longest Substring Without Repeating Characters Today I practiced a classic string problem in Java – finding the Longest Substring Without Repeating Characters. 🔹 Problem Statement: Given a string, find the longest substring that does not contain any repeating characters. 🔹 Approach I Used: I implemented a simple nested loop approach: Start checking substring from each index. Keep adding characters until a duplicate character appears. If a duplicate is found, break the loop. Track the maximum length substring during iteration. 💡 Key Concepts Used: String manipulation Nested loops indexOf() method Conditional logic 🧠 Why this problem is useful? This problem helps strengthen understanding of strings, loops, and algorithmic thinking, which are very important for coding interviews and problem solving. 📌 Example Input: "tessdfgteststest" 📌 Output: Longest substring without repeating characters. #Java #DSA #CodingPractice #ProblemSolving #JavaDeveloper #Programming #LearningJourney

This one Java concept silently breaks your understanding of OOP. Static methods are not overridden. They are hidden. Most developers don’t realize this until an interview exposes it. Let’s take a simple example: look at code image Challenge: What do you think this prints? What will be the output if we remove static from both methods? Let’s see how you reason about it 👇 #Java #BackendDevelopment #SoftwareEngineering #OOP #JavaDeveloper

🚀 Master Java Streams API – The Complete Guide with Practical Examples If you're still writing long loops in Java… you're missing out on one of the most powerful features introduced in Java 8. I’ve published a complete, practical guide on Java Streams API covering: ✅ What Streams really are (beyond theory) ✅ Intermediate vs Terminal operations ✅ Real-world examples (filter, map, reduce, grouping) ✅ Performance tips & when NOT to use streams ✅ Clean, readable, production-ready code Streams bring functional programming to Java, making your code more concise, readable, and maintainable. 💡Whether you're preparing for interviews or building scalable backend systems, this guide will help you level up. 🔗 Read here: https://lnkd.in/gD6ETYDH⁠ 💬 What’s your favorite Stream operation? map, filter, or reduce? #Java #JavaStreams #BackendDevelopment #SpringBoot #Programming #Coding #SoftwareEngineering #TechBlog #Developers #100DaysOfCode

⛓️💥 𝐒𝐲𝐬𝐭𝐞𝐦.𝐨𝐮𝐭.𝐩𝐫𝐢𝐧𝐭𝐥𝐧("𝐇𝐞𝐥𝐥𝐨 𝐖𝐨𝐫𝐥𝐝"); let's break this line to understand step by step We use this in almost every Java program. But have you ever thought what’s happening behind the scenes? 🪩 𝐒𝐲𝐬𝐭𝐞𝐦 A predefined class in Java from java.lang package ♟️𝐨𝐮𝐭 "out" is actually an object of type PrintStream. PrintStream is a class inside "System" class. 𝐏𝐫𝐢𝐧𝐭𝐒𝐭𝐫𝐞𝐚𝐦 : A class used to print output ♟️ 𝐩𝐫𝐢𝐧𝐭𝐥𝐧() (Instance method) A method of PrintStream class Used to print output with a new line 🔍 Putting it all together 𝐒𝐲𝐬𝐭𝐞𝐦.𝐨𝐮𝐭.𝐩𝐫𝐢𝐧𝐭𝐥𝐧("𝐇𝐞𝐥𝐥𝐨"); "System" → class "out" → static reference variable "println()" → method ➡️ So internally we are calling println() method using PrintStream object ("out") 🎈 𝐈𝐦𝐩𝐨𝐫𝐭𝐚𝐧𝐭 𝐈𝐧𝐬𝐢𝐠𝐡𝐭 "out" is already created [static] That’s why we don’t use "new" here 🎈 𝐒𝐢𝐦𝐩𝐥𝐞 𝐰𝐚𝐲 𝐭𝐨 𝐮𝐧𝐝𝐞𝐫𝐬𝐭𝐚𝐧𝐝 System → class out → object println() → action 📞We are calling 𝐩𝐫𝐢𝐧𝐭𝐥𝐧() method of PrintStream object (out) to print output. #Java #JavaDeveloper #JavaBackend #Programming #TechJourney #LearnBySharing #JavaConcepts #Coding #InterviewPrep

Day 3 of Java Interview Prep 🚀 4 Pillars of OOP 👇 1. Encapsulation 2. Inheritance 3. Polymorphism 4. Abstraction 💡 If you understand this, you understand Java Follow for Day 4 🔥