Mohamed Aymen Elarbi’s Post

Day 18 of #50DaysOfCode – Java Today’s challenge: Calculate the Product of Digits in a Number! A simple yet logical problem that enhances understanding of loops and arithmetic operations 💡 📘 Example: Input → 234 Output → 24 (2 × 3 × 4 = 24) #Java #CodingChallenge #50DaysOfCode #CodeEveryday #LogicBuilding #LearnToCode #ProgrammingBasics

🌟 Main Method in Java The main method is the entry point of every Java program. It allows the OS to hand over control to your code for execution. 📝 Signature: public static void main(String[] args) 💡 public → accessible to OS 💡 static → no object needed 💡 void → no return 💡 String[] args → command-line arguments ✅ Example: class Demo { public static void main(String[] args) { System.out.println("Hello World!"); } } #Java #ProgrammingBasics #Coding #HelloWorld #LearningJourney #ComputerScience

🔹 The 4 Pillars of Object-Oriented Programming in Java Understanding the core principles of Object-Oriented Programming — Encapsulation, Inheritance, Polymorphism, and Abstraction — is essential for writing clean, reusable, and scalable code in Java. In this post, Otávio Borges breaks down each of these pillars with clear examples to help developers strengthen their object-oriented mindset. 💡 #Java #OOP #ObjectOrientedProgramming #JavaDevelopers #Programming #SoftwareDevelopment #Coding #LearnJava #BrasilJUG #DevsJava

Day 23 of #50DaysOfCode – Java 💻 Today’s challenge was to check whether a number is a Perfect Number. A Perfect Number is a number that is equal to the sum of all its positive divisors (excluding itself). Example: 6 → 1 + 2 + 3 = 6 28 → 1 + 2 + 4 + 7 + 14 = 28 This problem helped me strengthen my understanding of loops, conditions, and mathematical logic 🔍✨ #Java #CodingChallenge #50DaysOfCode #LearnToCode #ProgrammingBasics #LogicBuilding #CodeDaily #ProblemSolving

💡 Java Collections — Under the Hood Understanding how collections work = writing faster, efficient code. 🔹 HashMap → Key-value, hash buckets + tree structure (since Java 8) 🔹 HashSet → Built on HashMap 🔹 ArrayList → Dynamic resizing arrays 🔹 LinkedList → Doubly linked nodes 🔹 TreeMap → Red-black tree sorted by key Master these, and performance tuning becomes instinctive ⚙️ 💬 Which one do you use most often — and why? #Java #DataStructures #Coding #SystemDesign #BackendDevelopment

🚀 Exploring Abstraction in Java! Today, I practiced one of the key OOP concepts — Abstraction using an example program in Java. In this program, I created an abstract class Shape and implemented different subclasses like Square, Rectangle, and Circle, each providing its own logic for calculating the area. ✨ Key Concepts Covered: Abstract classes and methods Method overriding Dynamic method dispatch Code reusability and clarity through abstraction 🧠 Output: The program accepts input for each shape and displays the calculated area dynamically. Learning abstraction helped me understand how we can hide implementation details and focus only on essential functionalities. 💻 #Java #OOPs #Abstraction #LearningByCoding #ProgrammingJourney #CodePractice

Day 22 of #50DaysOfCode – Java 🚀 Today’s challenge was to check whether a number is a Strong Number 💪 A Strong Number is a number in which the sum of the factorials of each digit equals the original number. Example: 145 → 1! + 4! + 5! = 145 ✔️ (Strong Number) This problem helped me practice: ✔️ Using loops inside loops ✔️ Calculating factorials ✔️ Strengthening logic-building skills #Java #CodingChallenge #50DaysOfCode #LogicBuilding #ProgrammingBasics #LearnToCode #DailyCoding #StrongNumber

Why Java Is Fast, Even With All That Syntax ? People often say: “Java has too many lines of code.” “It’s not modern enough.” But here’s the truth: Java's structure is its strength. The reason Java runs faster than many languages lies in its JVM optimizations, Just-In-Time (JIT) compilation, and static typing, which together make execution smoother and memory management smarter. Its “syntactic heaviness” isn’t a flaw, it's a framework of clarity. Every extra line ensures type safety, readability, and long-term scalability, things that lightweight languages often compromise. Java might make you type more, but it also makes your systems run faster, safer, and longer. #Java #Coding #SoftwareDevelopment #BackendEngineering #DevelopersCommunity #JVM #TechInsights #Programming

“𝒀𝒆𝒉 𝒐𝒓𝒊𝒈𝒊𝒏𝒂𝒍 𝒘𝒂𝒍𝒂 𝒌𝒚𝒖𝒏 𝒃𝒂𝒅𝒂𝒍 𝒈𝒂𝒚𝒂?” If you’ve ever asked that while cloning objects in Java — this post is for you! Here’s a simple visual breakdown of Shallow vs Deep Copy. #Java #LearningEveryday #SoftwareDevelopment #Coding

Another late-night success Solved a tricky binary search + sliding window problem efficiently in Java, optimizing power distribution logic in minimal runtime. 📊 Runtime: 31 ms 💡 Beats 89.29% of Java submissions 🧩 Concepts used: Binary Search, Prefix Sum, Sliding Window Each accepted solution reminds me that writing clean, efficient code isn’t just about passing tests — it’s about thinking like the system itself. #Java #LeetCode #ProblemSolving #Algorithms #CodingJourney