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HackerRank Java Solutions




Welcome to the HackerRank Java Solutions repository! Here you'll find my solutions to various HackerRank Java practice questions, organized by categories. If you're stuck on any of the challenges, feel free to check this repository for guidance and solutions.

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30 Days of Code

Advanced

Challenge Solution
Can You Access? Solution.java
Covariant Return Types Solution.java
Java Annotations Solution.java
Java Factory Pattern Solution.java
Java Lambda Expressions Solution.java
Java MD5 Solution.java
Java Reflection - Attributes Solution.java
Java SHA-256 Solution.java
Java Singleton Pattern Solution.java
Java Varargs - Simple Addition Solution.java
Java Visitor Pattern Solution.java
Prime Checker Solution.java

BigNumber

Challenge Solution
Java BigDecimal Solution.java
Java BigInteger Solution.java
Java Primality Test Solution.java

Data Structures

Challenge Solution
Java 1D Array (Part 2) Solution.java
Java 1D Array Solution.java
Java 2D Array Solution.java
Java ArrayList Solution.java
Java BitSet Solution.java
Java Dequeue Solution.java
Java Generics Solution.java
Java Hashset Solution.java
Java List Solution.java
Java Map Solution.java
Java Priority Queue Solution.java
Java Sort Solution.java
Java Stack Solution.java
Java Subarray Solution.java

Exception Handling

Challenge Solution
Java Exception Handling (Try-catch) Solution.java
Java Exception Handling Solution.java

Introduction

Challenge Solution
Java Stdin and Stdout I Solution.java
Java Currency Formatter Solution.java
Java Datatypes Solution.java
Java Date and Time Solution.java
Java End-of-file Solution.java
Java If-Else Solution.java
Java Int to String Solution.java
Java Loops I Solution.java
Java Loops II Solution.java
Java Output Formatting Solution.java
Java Static Initializer Block Solution.java
Java Stdin and Stdout II Solution.java
Welcome to Java Solution.java

Object Oriented Programming

Challenge Solution
Java Abstract Class Solution.java
Java Inheritance I Solution.java
Java Inheritance II Solution.java
Java Instanceof Keyword Solution.java
Java Interface Solution.java
Java Iterator Solution.java
Java Method Overriding 2 (Super Keyword) Solution.java
Java Method Overriding Solution.java

Strings

Challenge Solution
Java Anagrams Solution.java
Java Regex 2 - Duplicate Words Solution.java
Java Regex Solution.java
Java String Tokens Solution.java
Java Strings Introduction Solution.java
Java Substring Comparisons Solution.java
Java Substring Solution.java
Pattern Syntax Checker Solution.java
Tag Content Extractor Solution.java
Valid Username Regular Expression Solution.java

These solutions are my own work and were created for educational purposes on HackerRank. They may not be the most optimal solutions, but they passed HackerRank’s test cases.

We welcome contributions to enhance this collection of HackerRank Java Solutions:

  • Improve Existing Solutions: Optimize or clarify current solutions.
  • Add Explanations: Provide detailed explanations of code and problem-solving approaches.
  • Improve Documentation: Enhance the README, code comments or other documentation.

This project is open source and available under the MIT License.

Connect with me:

_mr_2001__ pavith-bambaravanage-465300293 @pavith_db pavith_db pavithd2020@gmail.com