🖥️ Java Practice

This repository contains a collection of Java practice programs organized from beginner to advanced.
The goal is to strengthen Java programming skills step by step — starting with basics, then moving to arrays, strings, OOP, and advanced concepts.

---

📂 Levels & Programs

🔹 Level 1 – Basics

• Hello World program
• Sum of two numbers
• Check even/odd number
• Find largest of two/three numbers
• Check leap year
• Swap two numbers (with and without third variable)
• Simple calculator using switch

---

🔹 Level 2 – Loops & Conditionals

• Multiplication table of a number
• Reverse a number
• Palindrome number check
• Armstrong number check
• Factorial (loop + recursion)
• Fibonacci series
• Sum of digits of a number
• Prime number check / Print primes in a range
• GCD & LCM of two numbers

---

🔹 Level 3 – Arrays

• Find largest & smallest element in an array
• Sort an array (Bubble sort, Selection sort)
• Linear search & Binary search
• Matrix addition, subtraction, multiplication
• Transpose of a matrix
• Remove duplicates from an array

---

🔹 Level 4 – Strings

• Reverse a string without using built-in methods
• Palindrome string check
• Count vowels & consonants in a string
• Find duplicate characters in a string
• Check if two strings are anagrams
• Convert string to uppercase & lowercase without built-in methods

---

🔹 Level 5 – Object-Oriented Programming (OOP)

• Student class (with details)
• Constructors (default & parameterized)
• Inheritance (Person → Student → Employee)
• Polymorphism (method overloading & overriding)
• Abstract class example
• Interface implementation
• Encapsulation (getters/setters)

---

🔹 Level 6 – Advanced Concepts

• Exception handling demo
• Multithreading (print even & odd numbers using 2 threads)
• File handling (read & write a text file)
• Collections demo (ArrayList, HashMap, HashSet)
• Implement a simple stack & queue using classes

---

🚀 How to Run

1. Clone the repository

   git clone https://github.com/SudharshanGeddam/Java-Practice.git