Java-Hackerrank-Solutions

30 Days Of Code

Day	Difficulty	Score	Challenge	Solution
Day 0	Easy	30	Hello world	Day00.java
Day 1	Easy	30	DataTypes	Day01.java
Day 2	Easy	30	Operators	Day02.java
Day 3	Easy	30	Intro to Conditional Statements	Day03.java
Day 4	Easy	30	Class Vs. Instance	Day04.java
Day 5	Easy	30	Loops	Day05.java
Day 6	Easy	30	Lets Review	Day06.java
Day 7	Easy	30	Arrays	Day07.java
Day 8	Easy	30	Dictionaries and Maps	Day08.java
Day 9	Easy	30	Recursion3	Day09.java
Day 10	Easy	30	Binary Numbers	Day10.java
Day 11	Easy	30	2d Arrays	Day11.java
Day 12	Easy	30	Inheritance	Day12.java
Day 13	Easy	30	Abstract Classes	Day13.java
Day 14	Easy	30	Scope	Day14.java
Day 15	Easy	30	Linked lists	Day15.java
Day 16	Easy	30	Exceptions-String to Integer	Day16.java
Day 17	Easy	30	More Exceptions	Day17.java
Day 18	Easy	30	Queues and Stacks	Day18.java
Day 19	Easy	30	Interfaces	Day19.java
Day 20	Easy	30	Sorting	Day20.java
Day 21	Easy	30	Generics	Day21.java
Day 22	Easy	30	Binary Search Trees	Day22.java
Day 23	Easy	30	BST Level-order traversal	Day23.java
Day 24	Easy	30	More Linked Lists	Day24.java
Day 25	Medium	30	Running Time and Complexity	Day25.java
Day 26	Easy	30	Nested Logic	Day26.java
Day 27	Easy	30	Testing	Day27.java
Day 28	Medium	30	RegEx, Patterns and Intro to Databases	Day28.java
Day 29	Medium	30	Bitwise AND	Day29.java

JAVA

Subdomain	Difficulty	Challenge	Solution
Introduction	Easy	Welcome to Java!	Welcome-to-java.java
Introduction	Easy	Java Stdin and Stdout I	Stdin-Stdout-1.java
Introduction	Easy	Java If-Else	If-else.java
Introduction	Easy	Java Stdin and Stdout II	Stdin-Stdout-2.java
Introduction	Easy	Java Output Formatting	Java-output-formatting.java
Introduction	Easy	Java Loops 1	Java-loops-1.java
Introduction	Easy	Java Loops 2	Java-loops-2.java
Introduction	Easy	Java Datatypes	Java-datatypes.java
Introduction	Easy	Java End of file	Java-end-of-file.java
Introduction	Easy	Java Static initializer Block	Java-static-initializer-block.java
Introduction	Easy	Java Int to string	Java-int-to-string.java
Introduction	Easy	Java Date and time	Java-date-time.java
Introduction	Easy	Java currency formatter	Java-currency-formatter.java
Strings	Easy	Java String Introduction	Java-string-introduction.java
Strings	Easy	Java Substring	Java-substring.java
Strings	Easy	Java Substring comparisons	Java-Substring-comparisons.java
Strings	Easy	Java String Reverse	Java-Reverse.java
Strings	Easy	Java Anagrams	Java-Anagrams.java
Strings	Easy	Java String Tokens	Java-String_tokens.java
Strings	Easy	Pattren Syntax Checker	Pattern-Syntax-Checker.java
Strings	Medium	Java Regex	Java-Regex.java
Strings	Medium	Java Regex 2 Duplicate words	Java-Regex2_duplicate-words.java
Strings	Easy	Valid Username Regular Expression	Valid-Username.java
Strings	Medium	Tag Content Extractor	Tag-Content-Extractor.java
Big Number	Medium	Java BigDecimal	Java-Big-Decimal.java
Big Number	Easy	Java Primality Test	Java-primality-test.java
Big Number	Easy	Java Big Integer	Java-BigInteger.java
Object Oriented Programming	Easy	Java Inheritance 1	Java-Inheritance1.java
Object Oriented Programming	Easy	Java Inheritance 2	Java-Inheritance2.java
Object Oriented Programming	Easy	Java Abstract Class	Java-AbstractClass.java
Object Oriented Programming	Easy	Java Interface	Java-Interface.java
Object Oriented Programming	Easy	Java Method Overriding	Java-Method-Overriding.java
Object Oriented Programming	Easy	Java Method Overriding (Super Keyword)	Java-Method-Overriding-Super-keyword.java
Object Oriented Programming	Easy	Java Instance Of	Java-Instanceof.java
Object Oriented Programming	Easy	Java Iterator	Java-Iterator.java
Exception Handling	Easy	Java Exception Handling (Try-Catch)	Java-Exception-Handling-1.java
Exception Handling	Easy	Java Exception Handling	Java-Exception-Handling-2.java
Data Structures	Easy	Java 1D Array	Java-1D-Array.java
Data Structures	Easy	Java 2D Array	Java-2D-Array.java
Data Structures	Easy	Java Sub Array	Java-Sub-Array.java
Data Structures	Easy	Java Array List	Java-Array-List.java
Data Structures	Medium	Java 1D Array (Part 2)	Java-1D-Array-2.java
Data Structures	Easy	Java List	Java-List.java
Data Structures	Easy	Java Map	Java-Map.java
Data Structures	Easy	Java Stack	Java-Stack.java
Data Structures	Easy	Java HashSet	Java-HashSet.java
Data Structures	Easy	Java Generics	Java-Generics.java
Advanced	Easy	Java Varargs - Simple Addition	Java-Var-Args.java
Advanced	Easy	Java Reflection - Attributes	Java-Reflection.java
Advanced	Medium	Java Can You Access?	Java-Can-You-Access.java
Advanced	Medium	Java Prime Checker	Java-prime-checker.java
Advanced	Easy	Java Factory Pattern	Java-Factory-Pattern.java
Advanced	Easy	Java Singleton Pattern	Java-Singleton-Pattern.java
Advanced	Medium	Java Visitor Pattern	Java-Visitor-Pattern.java
Advanced	Medium	Java Annotations	Java-Annotations.java
Advanced	Easy	Covariant Return Types	Java-Covariance.java
Advanced	Medium	Java Lambda Expressions	Java-Lambda-Expressions.java
Advanced	Medium	Java MD5	Java-MD5.java
Advanced	Medium	Java SHA-256	Java-Annotations.java