Today, I explored some interesting LeetCode problems to strengthen my Java and DSA fundamentals. Here’s a quick breakdown of what I solved 👇 🔹 Problem 1: Toeplitz Matrix 🧩 Question: Check whether all diagonals from top-left to bottom-right contain the same elements. 🧠 Approach: Traverse the matrix and compare each element with its bottom-right diagonal neighbor. If any mismatch occurs, return false; otherwise, true. This ensures every diagonal maintains uniformity. 📊 Complexity: Time: O(m × n) Space: O(1) 💡 Key Learning: Strengthened understanding of 2D array traversal and pattern validation. 🔹 Problem 2: Largest Number At Least Twice of Others 🧩 Question: Find the index of the largest element if it’s at least twice as large as every other element; otherwise, return -1. 🧠 Approach: Scan the array once to find the largest and second-largest elements. Check if the largest element is ≥ 2 × (second-largest). If true, return its index; else, return -1. 📊 Complexity: Time: O(n) Space: O(1) 💡 Key Learning: Practiced efficient single-pass array traversal and comparison logic. 🔹 Problem 3: Shortest Completing Word 🧩 Question: Given a license plate string and a list of words, find the shortest word that contains all the letters (and their frequencies) from the license plate. 🧠 Approach: Clean the license plate (keep only letters, make lowercase). Count frequency of each letter. For each word, check if it fulfills the required frequency. Track and return the shortest valid word. 📊 Complexity: Time: O(k × n), where k = number of words and n = average word length Space: O(1) 💡 Key Learning: Improved string manipulation, frequency mapping, and logical optimization. 🔥 Overall Takeaway: Practicing diverse problems like these boosts my problem-solving mindset, enhances Java coding efficiency, and builds confidence in tackling real-world algorithmic challenges 💪 Profile link ->https://lnkd.in/gFH_4R9a #Java #LeetCode #ProblemSolving #DSA #CodingPractice #LearningJourney #Developer #TechSkills #CodingInJava

🚀 Day 108 of Learning Java – Polymorphism Made Easy! Today I learned one of the most important OOP concepts in Java — Polymorphism 🔥 🔹 Poly = Many 🔹 Morphism = Forms/Behaviors ➡️ So one thing behaving in many different ways. ✅ What Polymorphism Means (Simple Language) Polymorphism lets the same method or object perform different actions depending on the situation. 📌 Example: A single function name like drive() can work differently for: Car Bike Bus Even though the method name is the same, the output changes based on the object. This makes our code clean, flexible, and easy to maintain. 🧠 Types of Polymorphism in Java 1️⃣ Compile-time Polymorphism (Method Overloading) Same method name, different parameters. 2️⃣ Run-time Polymorphism (Method Overriding) Child class gives its own version of the parent class method. 💡 Why It’s Important? ✔️ Reduces code duplication ✔️ Makes your code dynamic ✔️ Helps in writing reusable and extensible programs Excited to learn more concepts and keep leveling up every day! 🔥 #Day108 #Java #LearningJourney #OOP #Polymorphism #CodingJourney

My Java Learning Series Encapsulation: Where My OOP Journey Truly Begins Today marked a turning point in my Java journey. I dove into Object-Oriented Programming (OOP), and it struck me how elegantly it mirrors real-world systems—much like how the heart powers the human body: quietly, efficiently, and essentially. Java's OOP foundation rests on four core pillars: Encapsulation Inheritance Polymorphism Abstraction Today, I explored Encapsulation—and it felt like unlocking the secret to secure, robust software design. What I Discovered Encapsulation is fundamentally about data protection. It's the practice of concealing internal workings while exposing only what's essential. Think of it as a secure vault: ✓ Data members stay private ✓ Access is controlled through public getters and setters ✓ The this keyword acts as our guide—keeping instance and local variables distinct Constructors: The Foundation Builders Then came an eye-opening moment: understanding constructors. They're often confused with methods, but they're fundamentally different. A constructor: Shares its name with the class Returns nothing, yet initializes everything Is invoked automatically when an object is created This distinction clarified not just syntax, but design intent. Why This Resonates Encapsulation isn't merely a coding practice—it's a design philosophy. It trains us to build systems that are: Secure by default Easy to maintain Modular and scalable Today, I took my first deliberate step toward thinking like a software architect, not just a coder. #Java #OOP #Encapsulation #SoftwareDevelopment #LearningInPublic #Coding #Programming #Consistency #DailyLearning #CodeDaily TAP Academy

Day 26 : Today’s Java Learning: Interfaces Unlocked! Interfaces in Java aren’t just syntax—they’re a powerful design principle. I dove deep into how interfaces help achieve standardization, polymorphism, and loose coupling in code. Here's what I learned: 🔹 An interface is a collection of pure abstract methods—only method signatures, no bodies. 🔹 It acts like a contract: any class that implements it must honor its structure. 🔹 Interface references can point to implementing class objects, enabling flexible polymorphism. 💡 12 Key Rules of Interfaces I explored today: 1️⃣ Interfaces standardize method naming across implementations. 2️⃣ Promote polymorphism and loose coupling. 3️⃣ All methods are implicitly public abstract. 4️⃣ Specialized methods aren’t accessible via interface reference. 5️⃣ Partial implementation = abstract class. 6️⃣ No diamond problem—interfaces don’t inherit method bodies. 7️⃣ Interfaces cannot implement other interfaces. 8️⃣ But they can extend other interfaces (hello, multiple inheritance!). 9️⃣ A class can extend another class and implement interfaces (in that order). 🔟 Variables in interfaces are public static final by default. 1️⃣1️⃣ Empty interfaces = Marker Interfaces (used for tagging). 1️⃣2️⃣ You cannot instantiate an interface directly. 📌 This session helped me appreciate how interfaces shape scalable, maintainable code. Next up: diving into real-world use cases and design patterns using interfaces! If you’re exploring Java or building interview-ready logic, let’s connect and grow together. I love sharing my journey and learning from yours! #JavaLearning #InterfacesInJava #ObjectOrientedProgramming #Polymorphism #MarkerInterface #JavaInterviewPrep #CodeWithClarity #TapAcademy #LinkedInLearning #WomenWhoCode #TechJourney TAP Academy

📘 Day 72 | Learning Update 📌 Topic - Collection Framework in Java Today's I learned: ✅️ Stack Class in Java ✔️ Declaration of Stack Class ✔️ Methods of Stack Class ✔️ Implementation of Stack Class ✅️ Queue Interface In Java ✔️ Declaration of Queue Interface ✔️ Common Implementations of Queue Interface ✔️ Methods of Queue Interface 1️⃣ ArrayDeque – Resizable, double-ended queue. 🔹️Syntax, Methods & Example ( Non-Generic & Generic Collection of ArrayDeque ) 2️⃣ LinkedList – Doubly linked list implementation. 🔹️Syntax, Methods & Example ( Non-Generic & Generic Collection of LinkedList ) 3️⃣ PriorityQueue – Queue ordering elements by priority. 🔹️Syntax, Methods & Example ( Non-Generic & Generic Collection of PriorityQueue ) ✅️ Difference Between ArrayDeque, LinkedList & PriorityQueue ✅️ Map Interface in Java ✔️ Declaration of Map Interface ✔️ Common Implementations of Map Interface ✔️ Methods of Map Interface ✔️ Implementation of Map Interface 1️⃣ HashMap – Unordered key-value pairs using hashing. 🔹️Syntax, Methods & Example ( Non-Generic & Generic Collection of HashMap ) 2️⃣ LinkedHashMap – Insertion-ordered key-value pairs. 🔹️Syntax, Methods & Example ( Non-Generic & Generic Collection of LinkedHashMap ) 3️⃣ TreeMap – Sorted key-value pairs. 🔹️Syntax, Methods & Example ( Non-Generic & Generic Collection of TreeMap ) ✅️ Difference Between HashMap, LinkedHashMap & TreeMap 🚀 Thanks to my mentor PRATIKSHA INDROL Ma'am for helping me understand the Collection Framework in Java with simple and practical explanations.💻✨️ #Day72 #Domain #CoreJava #JavaProgramming #LearningJourney #FortuneCloud #CollectionFramework #180DayChallenge #JavaFullStackDeveloper

☕ Java Learning – Day 3 Progress Today’s focus was on one of the most powerful building blocks of any programming language Operators! 1. Learned how Arithmetic, Relational, Logical, Assignment, and Unary operators work behind every expression. 2. Practiced real examples like comparison between numbers, logical decisions, and simple calculations. 3. Realized how operators silently make code “think” and “decide.” Step by step, Java is becoming more fun and logical! 💻✨ #Java #CodingJourney #LearnInPublic #CodeEveryday #Developers

💻 Exploring the Power of Recursion in Java 🔁 Recently, I deepened my understanding of one of the most elegant concepts in programming — Recursion. Recursion allows a method to call itself, breaking complex problems into smaller, more manageable parts. It’s a foundational concept that strengthens problem-solving and logical thinking skills. In my recent Java practice, I implemented and explored recursion through the following examples: ✅ Printing numbers from 1 to n using recursion ✅ Printing numbers from n to 1 ✅ Calculating the factorial of a number ✅ Finding the sum of first n natural numbers ✅ Generating Fibonacci series using recursion Each of these programs reinforced how base cases and recursive calls work together to solve problems efficiently and elegantly. Here’s what I learned: ✨ Simplicity in logic often hides deep mathematical beauty. ✨ Recursive thinking is essential for mastering data structures like trees and graphs. ✨ Writing clean and efficient recursive code enhances both coding style and performance. I’m excited to continue building more projects in Java and exploring advanced topics like backtracking, divide & conquer, and dynamic programming. #Java #Recursion #Programming #LearningJourney #Coding #SoftwareDevelopment #StudentsWhoCode

👋 Hi Connections! 💻 Today I worked on an interesting Java problem — finding unique pairs in an array whose sum equals a target value! 🎯 🧩 Problem: Given an array and a target, find how many unique pairs exist such that their sum = target. ⚙️ My Approach: I used the two-pointer technique on a sorted array: ➡️ Initialize two pointers (start and end). ➡️ If the current sum is less than the target → move start forward. ➡️ If the sum is greater → move end backward. ➡️ If the sum equals the target → record it, skip duplicates, and move both pointers. ✨ This avoids unnecessary comparisons and handles duplicates smartly, giving a clean O(n) solution! 💡 What I Learned: ✅ The two-pointer method is perfect for pair-sum problems. ✅ Skipping duplicates carefully improves accuracy and avoids redundancy. ✅ Thinking in patterns rather than brute-force leads to elegant solutions. Every problem solved is one more step in improving my DSA intuition and optimization mindset 💪🔥 #Java #DSA #Coding #ProblemSolving #TwoPointers #LeetCode #Programming #LearningEveryday

🌟 Day 22 of My Java Learning Series 🌟 Today’s focus: Inheritance — a core pillar of OOP that unlocks code reusability, modularity, and scalability. 🔍 Covered Concepts: Types: Single, Multilevel, Hierarchical Advantages: Less duplication, better maintainability Rules: No inheritance of private members or constructors this() vs super() — constructor chaining made clear Method types: Inherited, Overridden, Specialized Access Specifiers: public, protected, default, private 💡 Manual implementation + debugging = clarity unlocked! Each concept felt like a puzzle piece falling into place. Let’s connect if you’re learning Java or prepping for interviews — I’d love to grow together! #JavaLearning #OOPsConcepts #InheritanceInJava #thisVsSuper #AccessSpecifiers #CodeNewbie #WomenInTech #100DaysOfCode #TapAcademy #InterviewPrep #SowmyaLearnsJava #JavaDeveloper #LearningNeverStops #TechJourney TAP Academy

🧠 Today I Learned: Constructor Chaining in Java Hey everyone 👋 Today, I explored a very interesting concept in Java — Constructor Chaining. 🔹 What is Constructor Chaining? Constructor Chaining is a process where one constructor calls another constructor. It helps to reuse code and initialize objects in a clean and consistent way. Constructor Chaining can be achieved in two ways: 1️⃣ Within the same class → using the this() call 2️⃣ From child class to parent class → using the super() call 💡 Focus of My Learning Today: I focused on Local Constructor Chaining — i.e., chaining constructors within the same class. If a constructor calls another constructor in the same class, it’s called Local Chaining. 👉 It is achieved using the this() call method. Example: class Student { Student() { this(101, "Bala"); System.out.println("Default Constructor"); } Student(int id, String name) { System.out.println("Parameterized Constructor: " + id + " " + name); } } Output: Parameterized Constructor: 101 Bala Default Constructor 🔍 Key Differences Between this and this() this: 🔹The this keyword is used to refer to the current executing object in heap memory. 🔹It is used to overcome shadowing problems between instance variables and local variables. 🔹The this keyword can be used inside methods or constructors, and it can appear anywhere within the class. this(): 🔹The this() call is used to call another constructor within the same class. 🔹It can be used only inside constructors. 🔹It must always appear as the first statement inside a constructor — otherwise, the compiler will throw an error. ✨ Key Takeaways this → refers to the current object (helps resolve shadowing). this() → used for constructor chaining within the same class. Always remember: this() must be the first statement inside a constructor. 💬 Learning these subtle differences made the concept much clearer for me. If you're learning Java, try experimenting with both this and this() to really feel the difference! 🚀 #Java #LearningJourney #OOPs #ConstructorChaining #thisKeyword #JavaDeveloper #LinkedInLearning