Mastering HashSet in Java with Tap Academy

🚀 Day 58 at Tap Academy – Core Java Journey Today’s session was all about understanding powerful data structures and concepts that improve performance and efficiency in Java. 📚 What I learned today: 🔹 HashSet and its features 🔹 Hashing, Hash Functions & Hash Table properties 🔹 Load Factor and Bucket Locations 🔹 When to use HashSet effectively 🔹 LinkedHashSet and its advantages 🔹 Introduction to Map interface 🔹 HashMap and LinkedHashMap concepts These concepts helped me understand how data is stored, retrieved, and managed efficiently using hashing techniques. It’s exciting to see how these structures play a crucial role in real-world applications! 💡 Every day is a step closer to becoming a better developer. #Java #CoreJava #LearningJourney #TapAcademy #Programming #DataStructures #100DaysOfCode #DeveloperLife

Day 54 of Sharing What I’ve Learned 🚀 HashSet in Java — Fast, Unique, and Efficient After exploring ArrayDeque, I learned another powerful collection in Java that focuses on uniqueness and fast lookups — HashSet. 🔹 What is HashSet? HashSet is an implementation of the Set interface that stores unique elements only. 👉 It does not allow duplicate values and is backed by a hash table. 🔹 Why use HashSet? ✔ No Duplicates Automatically ensures that every element is unique. ✔ Fast Performance Offers very fast add, remove, and contains operations on average. ✔ Simple and Efficient Best when you need to store only unique values without caring about order. 🔹 Key Features ✔ Stores unique elements ✔ Does not maintain insertion order ✔ Allows one null value ✔ Uses hashing for quick access 🔹 Important Methods ✔ add() ✔ remove() ✔ contains() ✔ size() ✔ isEmpty() 🔹 When should we use HashSet? 👉 Use HashSet when: ✔ You want to store unique values only ✔ You need fast searching ✔ Order of elements does not matter 🔹 When NOT to use? ❌ When you need duplicates ❌ When you need insertion order ❌ When you need sorted elements 🔹 Key Insight 💡 HashSet is not about keeping things in order — 👉 it is about keeping things unique and accessible quickly. 🔹 Day 54 Realization 🎯 Sometimes the best data structure is not the one that does the most — 👉 it is the one that does exactly what you need, efficiently. #Java #HashSet #DataStructures #CollectionsFramework #Programming #DeveloperJourney #100DaysOfCode #Day54 Grateful for guidance from, Sharath R TAP Academy

Headline: Exploring the "Leila and Majnu" 👫 of Java ☕ : Exception Handling at TAP Academy 🚀 Java development isn't just about writing code that works; it’s about writing code that doesn't break when the unexpected happens. Today at Tap Academy, we transitioned from the pillars of OOP into the essential world of Exception Handling with Sharath R sir. Key highlights from the session: 🔹 Functional Interfaces: Understanding the architecture behind JDK 8/9 features like Runnable and Comparator. 🔹 Errors vs. Exceptions: Learning to distinguish between faulty coding (Syntax Errors) and faulty inputs (Exceptions) that occur at runtime. 🔹 The Anatomy of a Crash: A deep dive into how the JVM and Runtime System (RTS) manage exception objects to prevent data loss. 🔹 Try-Catch Synergy: Why the try and catch blocks are the "Leila and Majnu" of Java—interdependent and essential for preventing abrupt program termination. Exception handling is the difference between a professional, resilient application and one that frustrates users with "App Not Responding" pop-ups. Looking forward to tomorrow's "twist" in the story as we explore multiple catch blocks! Sharath R TAP Academy #Java #Programming #TapAcademy #ExceptionHandling #SoftwareDevelopment #TechLearning #JavaFullStack #OOP #CodingLife

🚀 Day 31 at Tap Academy | Java Full Stack Development Today’s learning was all about Inheritance in Java – one of the core concepts of Object-Oriented Programming (OOP). 🔹 What is Inheritance? Inheritance allows one class to acquire the properties and behavior of another class, promoting code reusability and better structure. 💡 Key Advantages: ✔ Code Reusability ✔ Reduces Development Time & Effort ✔ Improves Maintainability 📚 Types of Inheritance in Java: 1️⃣ Single Inheritance 2️⃣ Multilevel Inheritance 3️⃣ Hierarchical Inheritance 4️⃣ Hybrid Inheritance ✨ Also learned that java.lang.Object is the root of all classes in Java. 📈 Every day is a step closer to becoming a better developer! #Java #OOP #Inheritance #LearningJourney #FullStackDevelopment #TapAcademy #100DaysOfCode #HarshitT

🚀 LinkedHashSet in Java Collections Continuing my journey in Set-based collections, I explored LinkedHashSet, which combines the power of HashSet + ordering. 🔹 What is LinkedHashSet? LinkedHashSet is a class in Java Collections Framework that: Stores unique elements Maintains insertion order 👉 It is an ordered version of HashSet 🔹 Key Properties ✅ Maintains insertion order ❌ Does not allow duplicates ✅ Allows only one null value ✅ Supports heterogeneous data ⚡ Faster than TreeSet, slightly slower than HashSet 🔹 Internal Working Uses Hash Table + Doubly Linked List Hashing ensures fast performance Linked list maintains order of insertion 👉 Like HashSet, it depends on: hashCode() equals() 🔹 Constructors LinkedHashSet() LinkedHashSet(int capacity) LinkedHashSet(Collection c) LinkedHashSet(int capacity, float loadFactor) ⭐ 👉 Default load factor = 0.75 🔹 Important Methods add(E e) remove(Object o) contains(Object o) size() isEmpty() clear() iterator() forEach() 🔹 Traversal (Accessing Elements) For-each loop Iterator Stream API ❌ No indexing ❌ No ListIterator 🔹 Performance Add / Remove / Search → O(1) (average) Slightly slower than HashSet (due to maintaining order) 🔹 LinkedHashSet vs HashSet HashSet → No order LinkedHashSet → Maintains insertion order 👉 Use LinkedHashSet when you need: Uniqueness + Order 🔹 When to Use LinkedHashSet? When duplicates are not allowed When insertion order matters When you need fast lookup + predictable iteration order 🔹 Learning Outcome Clear understanding of ordered vs unordered sets Strong clarity on hashing + linked structure Ability to choose between HashSet and LinkedHashSet 🙌 Special thanks to the amazing trainers at TAP Academy: kshitij kenganavar Sharath R MD SADIQUE Bibek Singh Vamsi yadav Hemanth Reddy Harshit T Ravi Magadum Somanna M G Rohit Ravinder TAP Academy Grateful to Tap Academy for building strong Java fundamentals 🚀 #TapAcademy #Week13Learning #CoreJava #CollectionsFramework #LinkedHashSet #HashSet #DataStructures #JavaFundamentals #LearningByDoing #FullStackJourney #VamsiLearns

🚀 Day 56 at Tap Academy – Core Java Journey Today’s session was focused on ArrayDeque in Java. I learned how ArrayDeque works as a dynamic array-based implementation of a double-ended queue (Deque), allowing insertion and deletion from both ends efficiently. 🔹 Key Takeaways: • Difference between Queue and Deque • Methods like addFirst(), addLast(), removeFirst(), removeLast() • Faster performance compared to Stack and LinkedList in many scenarios • Real-time use cases of ArrayDeque Consistent learning and hands-on practice are helping me strengthen my Java fundamentals step by step 💻 #Day56 #TapAcademy #CoreJava #JavaLearning #ArrayDeque #ProgrammingJourney #FutureDeveloper

Exploring one of the most powerful concepts in Java — Polymorphism, and I achieved it using Inheritance with a simple Plane program. In Java, polymorphism allows a single object to take multiple forms. Using inheritance and method overriding, I implemented a Plane example where different types of planes (like Cargo Plane and Passenger Plane) show different behaviors even though they share a common parent class. It was really interesting to see how a parent class reference can call different implementations at runtime — making the program dynamic and flexible. A big thank you to TAP Academy for teaching this concept so clearly and effortlessly. The real-time examples, like the Plane program, made it much easier to understand how inheritance and polymorphism work together. Excited to apply these concepts in real-world projects and keep growing 🚀 #Java #OOP #Polymorphism #Inheritance #CodingJourney #Learning #SoftwareDevelopment #TAPAcademy

Day 57 of Sharing What I’ve Learned🚀 PriorityQueue in Java — Processing Based on Priority After learning how TreeSet keeps elements sorted, I explored something even more practical — PriorityQueue. 👉 It doesn’t just store elements… it processes them based on priority 🔹 What is PriorityQueue? PriorityQueue is a part of the Java Collections Framework that stores elements in a way where the highest (or lowest) priority element is always processed first. 👉 It is internally based on a Heap (Min-Heap by default) 🔹 How does PriorityQueue work? 👉 Elements are not stored in full sorted order 👉 Only the head element is guaranteed to be the smallest (default) 👉 Insertion and removal maintain heap structure ✔ peek() → gives highest priority element ✔ poll() → removes highest priority element 🔹 Why use PriorityQueue? ✔ Priority-Based Processing Elements are handled based on importance, not insertion order ✔ Efficient Operations Insertion & deletion are faster than full sorting ✔ Real-World Use Cases 👉 Task scheduling 👉 CPU job scheduling 👉 Dijkstra’s Algorithm 👉 Event-driven systems 🔹 Key Features ✔ Allows duplicate elements ✔ Does NOT allow null values ✔ Not thread-safe ✔ Default is Min-Heap (smallest first) 🔹 Important Methods ✔ add() / offer() ✔ poll() ✔ peek() ✔ remove() 🔹 When should we use PriorityQueue? 👉 Use it when: ✔ You need to process elements by priority ✔ You don’t need full sorting ✔ You want efficient retrieval of min/max 🔹 When NOT to use? ❌ When you need full sorted traversal → use TreeSet ❌ When insertion order matters → use LinkedList/Queue ❌ When random access is required 🔹 Key Insight 💡 PriorityQueue doesn’t sort everything… 👉 It only guarantees the most important element comes first 🔹 Day 57 Realization 🎯 Not all problems need full sorting… 👉 Sometimes, knowing the “next most important” element is enough #Java #PriorityQueue #DataStructures #CollectionsFramework #Programming #DeveloperJourney #100DaysOfCode #Day57 Grateful for guidance from, Sharath R TAP Academy

Day 55 of Sharing What I’ve Learned 🚀 LinkedHashSet in Java — Order + Uniqueness Combined After learning how HashSet ensures uniqueness, I explored something even more practical — LinkedHashSet. 👉 It gives the best of both worlds: unique elements + predictable order 🔹 What is LinkedHashSet? LinkedHashSet is an implementation of the Set interface that maintains insertion order while storing unique elements. 👉 It is built on top of HashSet with a linked list to preserve order. 🔹 Why use LinkedHashSet? ✔ Maintains Order Elements are stored in the order they were inserted. ✔ No Duplicates Just like HashSet, duplicates are not allowed. ✔ Predictable Iteration Traversal happens in insertion order. 🔹 Key Features ✔ Stores unique elements ✔ Maintains insertion order ✔ Allows one null value ✔ Slightly slower than HashSet (due to ordering) 🔹 Important Methods ✔ add() ✔ remove() ✔ contains() ✔ size() ✔ isEmpty() 🔹 When should we use LinkedHashSet? 👉 Use LinkedHashSet when: ✔ You want unique elements ✔ You also need insertion order ✔ You want predictable iteration 🔹 When NOT to use? ❌ When order doesn’t matter → use HashSet ❌ When you need sorted order → use TreeSet 🔹 Key Insight 💡 LinkedHashSet is like HashSet with memory — 👉 it remembers the order in which elements were added. 🔹 Day 55 Realization 🎯 Sometimes small improvements (like maintaining order) 👉 can make a data structure much more useful in real-world applications. #Java #LinkedHashSet #DataStructures #CollectionsFramework #Programming #DeveloperJourney #100DaysOfCode #Day55 Grateful for guidance from, Sharath R TAP Academy

Java Learning Journey – Day 27 Today I learned about one of the core OOP concepts — Inheritance in Java. 🔹 What is Inheritance? It allows a class to inherit properties and methods from another class using extends. 🔹 Example Concept: A Dog class can inherit from an Animal class and reuse its features. 🔹 Key Benefits: • Code reusability • Simplifies program structure • Enhances functionality 🔹 Access Modifiers: • public → Accessible everywhere • protected → Accessible within package & subclasses • default → Package-level access • private → Accessible only within class 💡 Key Learning: Inheritance helps in building clean, reusable, and scalable applications. Step by step growing in my Java development journey #Java #JavaDeveloper #OOP #Inheritance #Programming #CodingJourney #SoftwareDevelopment #Hariom #HariomKumar #Hariomcse