📘 Java Data Structures Course

Welcome to the official repository for the Java Data Structures Course – a full hands-on journey into the world of data structures using Java 💻.

This course is designed to build strong foundations in data structures through clear explanations, real-world examples, and implementation from scratch. Whether you're a student preparing for university exams, interviews, or just want to master your skills — this is for you!

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🧠 What You’ll Learn

• 📦 ArrayList – dynamic arrays and internal logic
• 🔗 LinkedList – singly and doubly linked lists
• 🧱 Stack – LIFO behavior with use cases
• 📬 Queue – FIFO, circular queues, and variations
• 🧮 Recursion – single, double, and backtracking
• 🗃️ HashMap & HashSet – hashing fundamentals
• 🌲 Trees – binary trees, traversals, and BSTs
• 🕸️ Graphs – adjacency list, BFS, DFS, and basic pathfinding
• 🧩 Problem Solving – multiple coding problems for each structure

🔧 Each data structure includes:

• Full Java implementation from scratch
• A main class for quick testing
• A Problems class for common coding exercises

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📁 Project Structure

📦 data_structures_course/
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├── 📁 arraylist/         # Implementations + Problems for ArrayList
├── 📁 linkedlist/        # Singly/Doubly Linked List + Practice
├── 📁 stack/             # Stack logic + common problems
├── 📁 queue/             # Queue, Circular Queue, and applications
├── 📁 hashmap_hashset/   # Basic HashMap & HashSet examples
├── 📁 recursion/         # Single and double recursion patterns
├── 📁 trees/             # Binary Tree, BST, and traversal problems
├── 📁 graphs/            # Adjacency List/Matrix + BFS & DFS
├── 📁 utils/             # Input helpers or shared utilities
└── 📄 README.md          # Course overview and instructions