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# Hackerrank JAVA Solutions

<a href="https://www.hackerrank.com/chitturiarun">
 <img height=85 src="https://d3keuzeb2crhkn.cloudfront.net/hackerrank/assets/styleguide/logo_wordmark-f5c5eb61ab0a154c3ed9eda24d0b9e31.svg">
 </a>
 
 Efficient solutions to HackerRank JAVA problems
 
 <a href="https://www.hackerrank.com/chitturiarun">
 <img height=120 src="https://aruntech.xyz/JAVA.JPG">
 </a>

This repository consists of JAVA Solutions as of 1st April 2020
 
TOPICS:
* [Introduction](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction)
* [Strings](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings)
* [Big Number](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/BigNumber)
* [Data Structures](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures)
* [Object Oriented Programming](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Object%20Oriented%20Programming)
* [Exception Handling](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Exception%20Handling)
* [Advanced](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced)

# Java

|          Subdomain          |                                                         Challenge                                                        | Points |                                                                                         Solution                                                                                        |
|:---------------------------:|:------------------------------------------------------------------------------------------------------------------------:|:------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|
|         Introduction        | [Welcome to Java!](https://www.hackerrank.com/challenges/welcome-to-java)                                                |    3   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Welcome%20to%20Java!/Solution.java)                                                  |
|         Introduction        | [Java Stdin and Stdout I](https://www.hackerrank.com/challenges/java-stdin-and-stdout-1)                                 |    5   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Stdin%20and%20Stdout%20I/Solution.java)                                       |
|         Introduction        | [Java If-Else](https://www.hackerrank.com/challenges/java-if-else)                                                       |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20If-Else/Solution.java)                                                        |
|         Introduction        | [Java Stdin and Stdout II](https://www.hackerrank.com/challenges/java-stdin-stdout)                                      |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Stdin%20and%20Stdout%20II/Solution.java)                                      |
|         Introduction        | [Java Output Formatting](https://www.hackerrank.com/challenges/java-output-formatting)                                   |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Output%20Formatting/Solution.java)                                            |
|         Introduction        | [Java Loops I](https://www.hackerrank.com/challenges/java-loops-i)                                                       |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Loops%20I/Solution.java)                                                      |
|         Introduction        | [Java Loops II](https://www.hackerrank.com/challenges/java-loops)                                                        |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Loops%20II/Solution.java)                                                     |
|         Introduction        | [Java Datatypes](https://www.hackerrank.com/challenges/java-datatypes)                                                   |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Datatypes/Solution.java)                                                      |
|         Introduction        | [Java End-of-file](https://www.hackerrank.com/challenges/java-end-of-file)                                               |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20End-of-file/Solution.java)                                                    |
|         Introduction        | [Java Static Initializer Block](https://www.hackerrank.com/challenges/java-static-initializer-block)                     |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Static%20Initializer%20Block/Solution.java)                                   |
|         Introduction        | [Java Int to String](https://www.hackerrank.com/challenges/java-int-to-string)                                           |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Int%20to%20String/Solution.java)                                              |
|         Introduction        | [Java Date and Time](https://www.hackerrank.com/challenges/java-date-and-time)                                           |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Date%20and%20Time/Solution.java)                                              |
|         Introduction        | [Java Currency Formatter](https://www.hackerrank.com/challenges/java-currency-formatter)                                 |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Introduction/Java%20Currency%20Formatter/Solution.java)                                           |
|           Strings           | [Java Strings Introduction](https://www.hackerrank.com/challenges/java-strings-introduction)                             |    5   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Java%20Strings%20Introduction/Solution.java)                                              |
|           Strings           | [Java Substring](https://www.hackerrank.com/challenges/java-substring)                                                   |    5   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Java%20Substring/Solution.java)                                                           |
|           Strings           | [Java String Compare](https://www.hackerrank.com/challenges/java-string-compare)                                         |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Java%20String%20Compare/Solution.java)                                                    |
|           Strings           | [Java String Reverse](https://www.hackerrank.com/challenges/java-string-reverse)                                         |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Java%20String%20Reverse/Solution.java)                                                    |
|           Strings           | [Java Anagrams](https://www.hackerrank.com/challenges/java-anagrams)                                                     |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Java%20Anagrams/Solution.java)                                                            |
|           Strings           | [Java String Tokens](https://www.hackerrank.com/challenges/java-string-tokens)                                           |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Java%20String%20Tokens/Solution.java)                                                     |
|           Strings           | [Pattern Syntax Checker](https://www.hackerrank.com/challenges/pattern-syntax-checker)                                   |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Pattern%20Syntax%20Checker/Solution.java)                                                 |
|           Strings           | [Java Regex](https://www.hackerrank.com/challenges/java-regex)                                                           |   25   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Java%20Regex/Solution.java)                                                               |
|           Strings           | [Java Regex 2 - Duplicate Words](https://www.hackerrank.com/challenges/duplicate-word)                                   |   25   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Java%20Regex%202%20-%20Duplicate%20Words/Solution.java)                                   |
|           Strings           | [Java Regex 3 - Username Checker](https://www.hackerrank.com/challenges/valid-username-checker)                          |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Java%20Regex%203%20-%20Username%20Checker/Solution.java)                                  |
|           Strings           | [Tag Content Extractor](https://www.hackerrank.com/challenges/tag-content-extractor)                                     |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Strings/Tag%20Content%20Extractor/Solution.java)                                                  |
|          BigNumber          | [Java BigInteger](https://www.hackerrank.com/challenges/java-biginteger)                                                 |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/BigNumber/Java%20BigInteger/Solution.java)                                                        |
|          BigNumber          | [Java BigDecimal](https://www.hackerrank.com/challenges/java-bigdecimal)                                                 |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/BigNumber/Java%20BigDecimal/Solution.java)                                                        |
|          BigNumber          | [Java Primality Test](https://www.hackerrank.com/challenges/java-primality-test)                                         |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/BigNumber/Java%20Primality%20Test/Solution.java)                                                  |
|       Data Structures       | [Java 1D Array](https://www.hackerrank.com/challenges/java-1d-array-introduction)                                        |    5   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%201D%20Array/Solution.java)                                                |
|       Data Structures       | [Java 2D Array](https://www.hackerrank.com/challenges/java-2d-array)                                                     |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%202D%20Array/Solution.java)                                                |
|       Data Structures       | [Java Subarray](https://www.hackerrank.com/challenges/java-negative-subarray)                                            |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20Subarray/Solution.java)                                                  |
|       Data Structures       | [Java Arraylist](https://www.hackerrank.com/challenges/java-arraylist)                                                   |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20ArrayList/Solution.java)                                                 |
|       Data Structures       | [Java 1D Array (Part 2)](https://www.hackerrank.com/challenges/java-1d-array)                                            |   25   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%201D%20Array%20(Part%202)/Solution.java)                                   |
|       Data Structures       | [Java Priority Queue](https://www.hackerrank.com/challenges/java-priority-queue/problem)                                 |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/blob/master/Data%20Structures/Java%20Priority%20Queue/Solution.java)                                   |
|       Data Structures       | [Java List](https://www.hackerrank.com/challenges/java-list)                                                             |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20List/Solution.java)                                                      |
|       Data Structures       | [Java Map](https://www.hackerrank.com/challenges/phone-book)                                                             |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20Map/Solution.java)                                                       |
|       Data Structures       | [Java Stack](https://www.hackerrank.com/challenges/java-stack)                                                           |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20Stack/Solution.java)                                                     |
|       Data Structures       | [Java Hashset](https://www.hackerrank.com/challenges/java-hashset)                                                       |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20Hashset/Solution.java)                                                   |
|       Data Structures       | [Java Generics](https://www.hackerrank.com/challenges/java-generics)                                                     |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20Generics/Solution.java)                                                  |
|       Data Structures       | [Java Comparator](https://www.hackerrank.com/challenges/java-comparator)                                                 |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20Comparator/Solution.java)                                                |
|       Data Structures       | [Java Sort](https://www.hackerrank.com/challenges/java-sort)                                                             |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20Sort/Solution.java)                                                      |
|       Data Structures       | [Java Dequeue](https://www.hackerrank.com/challenges/java-dequeue)                                                       |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20Dequeue/Solution.java)                                                   |
|       Data Structures       | [Java BitSet](https://www.hackerrank.com/challenges/java-bitset)                                                         |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Data%20Structures/Java%20BitSet/Solution.java)                                                    |
| Object Oriented Programming | [Java Inheritance I](https://www.hackerrank.com/challenges/java-inheritance-1)                                           |    5   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Object%20Oriented%20Programming/Java%20Inheritance%20I/Solution.java)                             |
| Object Oriented Programming | [Java Inheritance II](https://www.hackerrank.com/challenges/java-inheritance-2)                                          |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Object%20Oriented%20Programming/Java%20Inheritance%20II/Solution.java)                            |
| Object Oriented Programming | [Java Abstract Class](https://www.hackerrank.com/challenges/java-abstract-class)                                         |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Object%20Oriented%20Programming/Java%20Abstract%20Class/Solution.java)                            |
| Object Oriented Programming | [Java Interface](https://www.hackerrank.com/challenges/java-interface)                                                   |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Object%20Oriented%20Programming/Java%20Interface/Solution.java)                                   |
| Object Oriented Programming | [Java Method Overriding](https://www.hackerrank.com/challenges/java-method-overriding)                                   |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Object%20Oriented%20Programming/Java%20Method%20Overriding/Solution.java)                         |
| Object Oriented Programming | [Java Method Overriding 2 (Super Keyword)](https://www.hackerrank.com/challenges/java-method-overriding-2-super-keyword) |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Object%20Oriented%20Programming/Java%20Method%20Overriding%202%20(Super%20Keyword)/Solution.java) |
| Object Oriented Programming | [Java Instanceof keyword](https://www.hackerrank.com/challenges/java-instanceof-keyword)                                 |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Object%20Oriented%20Programming/Java%20Instanceof%20keyword/Solution.java)                        |
| Object Oriented Programming | [Java Iterator](https://www.hackerrank.com/challenges/java-iterator)                                                     |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Object%20Oriented%20Programming/Java%20Iterator/Solution.java)                                    |
|      Exception Handling     | [Java Exception Handling (Try-catch)](https://www.hackerrank.com/challenges/java-exception-handling-try-catch)           |   10   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Exception%20Handling/Java%20Exception%20Handling%20(Try-catch)/Solution.java)                     |
|      Exception Handling     | [Java Exception Handling](https://www.hackerrank.com/challenges/java-exception-handling)                                 |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Exception%20Handling/Java%20Exception%20Handling/Solution.java)                                   |
|           Advanced          | [Java Varargs - Simple Addition](https://www.hackerrank.com/challenges/simple-addition-varargs)                          |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced/Java%20Varargs%20-%20Simple%20Addition/Solution.java)                                    |
|           Advanced          | [Java Reflection - Attributes](https://www.hackerrank.com/challenges/java-reflection-attributes)                         |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced/Java%20Reflection%20-%20Attributes/Solution.java)                                        |
|           Advanced          | [Can You Access](https://www.hackerrank.com/challenges/can-you-access)                                                   |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced/Can%20You%20Access/Solution.java)                                                        |
|           Advanced          | [Prime Checker](https://www.hackerrank.com/challenges/prime-checker)                                                     |   25   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced/Prime%20Checker/Solution.java)                                                           |
|           Advanced          | [Java Factory Pattern](https://www.hackerrank.com/challenges/java-factory)                                               |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced/Java%20Factory%20Pattern/Solution.java)                                                  |
|           Advanced          | [Java Singleton Pattern](https://www.hackerrank.com/challenges/java-singleton)                                           |   15   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced/Java%20Singleton%20Pattern/Solution.java)                                                |
|           Advanced          | [Covariant Return Types](https://www.hackerrank.com/challenges/java-covariance)                                          |   20   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced/Covariant%20Return%20Types/Solution.java)                                                |
|           Advanced          | [Java MD5](https://www.hackerrank.com/challenges/java-md5)                                                               |   30   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced/Java%20MD5/Solution.java)                                                                |
|           Advanced          | [Java SHA-256](https://www.hackerrank.com/challenges/sha-256)                                                            |   30   | [Solution.java](https://github.com/Chitturiarunkrishna/HackerrankJAVA/tree/master/Advanced/Java%20SHA-256/Solution.java)                                                            |

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