LinkedHashSet Internal Working in Java | HashMap + Linked List Explained

How does LinkedHashSet maintain UNIQUE elements while preserving INSERTION ORDER? In this video, we go inside LinkedHashSet and understand how it uses LinkedHashMap, hashing, buckets, and a doubly-linked list to store and iterate elements. You will see the complete internal flow of: set.add("Apple") ↓ LinkedHashSet ↓ LinkedHashMap ↓ Hash calculation ↓ Bucket selection ↓ LinkedHashMap.Entry ↓ Hash table + doubly-linked list ↓ Insertion order We also visualize how multiple elements such as Apple, Banana, Orange, and Mango are added one by one, and what happens when a duplicate element is added. 🔥 Topics covered: • What is LinkedHashSet? • Why LinkedHashSet instead of HashSet? • LinkedHashSet internal working • LinkedHashMap internal structure • Hash table and bucket selection • LinkedHashMap.Entry • Doubly-linked list • How insertion order is maintained • How duplicate elements are detected • HashSet vs LinkedHashSet • Average O(1) basic operations • Real-world use case 📚 Core Java Masterclass Module 3 – Collections Framework Part 2 – LinkedHashSet This video is part of the KG Tech Studio Java Backend Masterclass. ▶ Next: TreeSet Internal Working in Java If you're preparing for Java interviews or working with Java Collections, this series covers the concepts from fundamentals to internal implementation. 👍 Like the video if it helped you understand LinkedHashSet. 💬 Comment below: What would you like to see explained next? 🔔 Subscribe to KG Tech Studio for Core Java, Java Backend, Spring Boot, Microservices and AI/ML content. #Java #LinkedHashSet #JavaCollections #CoreJava #JavaBackend