📚 Java Collection Framework

Your Complete Guide to Java Collections

Master List, Set, Queue, Map and all collection interfaces with practical implementations

Theory · Practical · Get Started

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📖 Table of Contents

• About
• Collection Hierarchy
• Projects
• Technologies
• Getting Started
• Learning Topics
• Contributing
• Contact

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🎯 About

The Java Collection Framework provides a unified architecture to store and manipulate groups of objects. This repository offers both theoretical understanding and practical implementations to help you master collections in Java.

Why Learn Collections?

• 🚀 Performance - Choose the right data structure for optimal performance
• 🔄 Reusability - Pre-built implementations save development time
• 📊 Algorithms - Built-in sorting, searching, and manipulation methods
• 🎯 Interview Ready - Most asked topic in Java interviews

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🏗️ Collection Hierarchy

                         ┌─────────────────┐
                         │    Iterable     │
                         └────────┬────────┘
                                  │
                         ┌────────▼────────┐
                         │   Collection    │
                         └────────┬────────┘
              ┌───────────────────┼───────────────────┐
              │                   │                   │
      ┌───────▼───────┐   ┌──────▼──────┐    ┌──────▼──────┐
      │     List      │   │    Set      │    │    Queue    │
      └───────┬───────┘   └──────┬──────┘    └──────┬──────┘
              │                  │                   │
    ┌─────────┼─────────┐    ┌───┴───┐         ┌────┴────┐
    │         │         │    │       │         │         │
ArrayList  LinkedList Vector HashSet TreeSet PriorityQueue Deque


                         ┌─────────────────┐
                         │      Map        │ (Separate Hierarchy)
                         └────────┬────────┘
              ┌───────────────────┼───────────────────┐
              │                   │                   │
          HashMap            TreeMap            LinkedHashMap

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📁 Projects

📖 Theory

Comprehensive theoretical documentation covering:

Topic	Description
Interfaces	Collection, List, Set, Queue, Map, Iterator
Classes	ArrayList, LinkedList, HashSet, TreeSet, HashMap
Algorithms	Sorting, Searching, Shuffling, Reversing
Comparators	Comparable vs Comparator interfaces

💻 Practical (IMPLEMENTATION)

Hands-on coding examples demonstrating:

Implementation	What You'll Learn
List Operations	Add, remove, get, indexOf, subList
Set Operations	Union, intersection, difference
Map Operations	put, get, keySet, values, entrySet
Queue Operations	offer, poll, peek, priority ordering

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🛠️ Technologies

Technology	Purpose
	Java 8+
	Eclipse IDE
	Version Control

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🚀 Getting Started

Prerequisites

• Java JDK 8 or higher
• Any Java IDE (Eclipse/IntelliJ/VS Code)

Installation

# Clone the repository
git clone https://github.com/Shubh2-0/Collection-Framework.git

# Navigate to project
cd Collection-Framework

# Open in your IDE and explore!

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📚 Learning Topics

List Interface

• ✅ ArrayList - Dynamic arrays with fast random access
• ✅ LinkedList - Doubly-linked list implementation
• ✅ Vector - Synchronized dynamic array

Set Interface

• ✅ HashSet - Unordered, no duplicates, O(1) operations
• ✅ LinkedHashSet - Maintains insertion order
• ✅ TreeSet - Sorted set using Red-Black tree

Map Interface

• ✅ HashMap - Key-value pairs with O(1) average lookup
• ✅ LinkedHashMap - Maintains insertion order
• ✅ TreeMap - Sorted by keys using Red-Black tree

Queue Interface

• ✅ PriorityQueue - Elements ordered by priority
• ✅ ArrayDeque - Double-ended queue implementation
• ✅ LinkedList as Queue - FIFO operations

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🤝 Contributing

Contributions are welcome! Whether it's:

• 📝 Adding new implementations
• 🐛 Fixing bugs
• 📖 Improving documentation
• 💡 Suggesting new topics

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📬 Contact

Shubham Bhati - Java Developer

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⭐ Star this repository if it helped you master Java Collections!

Keywords: Java Collections ArrayList HashMap HashSet LinkedList TreeMap Queue Stack Data-Structures Interview-Prep