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🚀 Data Structures & Algorithms in Java

Clean Code • Strong Fundamentals • Interview Ready

📌 About

This repository contains well-structured implementations of core Data Structures and Algorithms in Java.

✨ Focus:

  • Writing clean and readable code
  • Understanding time & space complexity
  • Building strong problem-solving skills

🧠 Topics Covered

🟦 Java Fundamentals

  • Variables & Data Types
  • Control Flow
  • Methods
  • Basic OOP Concepts

📊 Arrays

  • Traversal techniques
  • Searching methods
  • Common problem patterns
  • Complexity analysis

🔤 Strings

  • Character manipulation
  • Pattern-based problems
  • Efficient traversal

🔍 Searching Algorithms

  • Linear Search
  • Binary Search
  • ⏱ Complexity comparison: O(n) vs O(log n)

🔄 Sorting Algorithms

  • Bubble Sort
  • Selection Sort
  • Insertion Sort
  • Internal working & optimization

🔁 Recursion

  • Base case design
  • Recursive thinking
  • Stack memory behavior

🔗 Linked List

  • Singly Linked List
  • Doubly Linked List
  • Insertion & Deletion
  • Reversal techniques

📚 Stack

  • Array & Linked List implementation
  • LIFO principle
  • Applications:
    • Expression evaluation
    • Undo operations

🚶 Queue

  • Array & Linked List implementation
  • FIFO principle
  • Circular Queue & Deque

⚡ Bit Manipulation

  • Bitwise Operators: AND, OR, XOR, NOT, Shift
  • Tricks:
    • Check even/odd
    • Power of 2
    • Set/Unset bits
  • Performance optimizations

#️⃣ Hashing

  • Introduction to Hashing
  • Frequency Counting
  • HashMap Basics in Java
  • HashSet Basics in Java
  • Key-Value Mapping
  • Fast Lookup Operations
  • Time Complexity of HashMap (O(1) average case)

🛠️ Approach

✔ Write logic before coding
✔ Focus on clarity over clever tricks
✔ Analyze time & space complexity
✔ Organize solutions topic-wise

🎯 Goal

Build a strong foundation in DSA to:

  • Crack technical interviews 💼
  • Become a better problem solver 🧩
  • Prepare for backend development 🚀

🌟 Future Improvements

  • Add advanced topics (Trees, Graphs, DP)
  • Include real interview questions
  • Add visual explanations

⭐ Support

If you find this helpful, consider giving it a ⭐ on GitHub!

💡 Consistency > Motivation