HackerRank Java solutions

In this repository, you will find updated Java solutions for all HackerRank problems as of 2024.
Repo gathered by CodeRankGPT - Solve HackerRank coding problems during your coding interview, in real-time and undetectable 😎

JAVA

Subdomain	Challenge	Solution	Score
Introduction	Welcome to Java	WelcomeToJava.java	20
Introduction	Java Stdin & Stdout I	JavaStdinAndStdoutI.java	35
Introduction	Java If Else	JavaIfElse.java	25
Introduction	Java Stdin & Stdout II	JavaStdinAndStdoutII.java	40
Introduction	Java Output Format	JavaOutputFormatting.java	15
Introduction	Java Loops I	JavaLoopsI.java	45
Introduction	Java Loops II	JavaLoopsII.java	30
Introduction	Java Data types	JavaDatatypes.java	10
Introduction	Java End of file	JavaEndOfFile.java	50
Introduction	Java Static Init Block	JavaStaticInitializerBlock.java	20
Introduction	Java Int to String Conversion	JavaIntToString.java	35
Introduction	Java Date & Time	JavaDateAndTime.java	45
Introduction	Java Currency Formatter	JavaCurrencyFormatter.java	25
Strings	Java Strings Intro	JavaStringsIntroduction.java	20
Strings	Java Substring	JavaSubstring.java	15
Strings	Java Substring Comparison	JavaSubstringComparisons.java	40
Strings	Java String Reverse	JavaStringReverse.java	30
Strings	Java Anagram Check	JavaAnagrams.java	50
Strings	Java String Tokens	JavaStringTokens.java	10
Strings	Pattern Syntax Check	PatternSyntaxChecker.java	20
Strings	Valid Username Regex	ValidUsernameRegularExpression.java	35
Strings	Tag Content Extraction	TagContentExtractor.java	45
Strings	Java Regex	JavaRegex.java	15
Strings	Java Regex 2	JavaRegex2DuplicateWords.java	20
BigInteger	Java Big Integer	JavaBigInteger.java	50
BigInteger	Java Big Decimal	JavaBigDecimal.java	30
BigInteger	Java Primality Test	JavaPrimalityTest.java	10
Data Structures	Java 1D Array Intro	Java1DArray.java	40
Data Structures	Java 2D Array	Java2DArray.java	15
Data Structures	Java Subarray	JavaSubarray.java	25
Data Structures	Java Array List	JavaArraylist.java	20
Data Structures	Java Map	JavaMap.java	35
Data Structures	Java Hash Set	JavaHashset.java	50
Data Structures	Java Comparator	JavaComparator.java	45
Data Structures	Java Sorting	JavaSort.java	20
Data Structures	Java List	JavaList.java	15
Data Structures	Java Generics	JavaGenerics.java	30
Data Structures	Java Stack	JavaStack.java	25
Data Structures	Java Dequeue	JavaDequeue.java	35
Data Structures	Java Bit Set	JavaBitSet.java	50
Data Structures	Java Priority Queue	JavaPriorityQueue.java

Java 30 Days of Code

Day	Difficulty	Score	Challenge	Solution
Day 0	Easy	30	Hello world	solution-hello-world.java
Day 1	Easy	30	DataTypes	solution-data-types.java
Day 2	Easy	30	Operators	solution-operators.java
Day 3	Easy	30	Intro to Conditional Statements	solution-intro-to-conditional-statements.java
Day 4	Easy	30	Class Vs. Instance	solution-class-vs-instance.java
Day 5	Easy	30	Loops	solution-loops.java
Day 6	Easy	30	Lets Review	solution-review-loop.java
Day 7	Easy	30	Arrays	solution-arrays.java
Day 8	Easy	30	Dictionaries and Maps	solution-dictionaries-and-maps.java
Day 9	Easy	30	Recursion3	solution-recursion.java
Day 10	Easy	30	Binary Numbers	solution-binary-numbers.java
Day 11	Easy	30	2d Arrays	solution-2d-arrays.java
Day 12	Easy	30	Inheritance	solution-inheritance.java
Day 13	Easy	30	Abstract Classes	solution-abstract-classes.java
Day 14	Easy	30	Scope	solution-scope.java
Day 15	Easy	30	Linked lists	solution-linked-list.java
Day 16	Easy	30	Exceptions-String to Integer	solution-exceptions-string-to-integer.java
Day 17	Easy	30	More Exceptions	solution-more-exceptions.java
Day 18	Easy	30	Queues and Stacks	solution-queues-stacks.java
Day 19	Easy	30	Interfaces	solution-interfaces.java
Day 20	Easy	30	Sorting	solution-sorting.java
Day 21	Easy	30	Generics	solution-generics.java
Day 22	Easy	30	Binary Search Trees	solution-binary-search-trees.java
Day 23	Easy	30	BST Level-order traversal	solution-bst-level-order-traversal.java
Day 24	Easy	30	More Linked Lists	solution-more-linked-lists.java
Day 25	Medium	30	Running Time and Complexity	solution-running-time-and-complexity.java
Day 26	Easy	30	Nested Logic	solution-nested-logic.java
Day 27	Easy	30	Testing	solution-testing.java
Day 28	Medium	30	RegEx, Patterns and Intro to Databases	solution-regex-patterns.java
Day 29	Medium	30	Bitwise AND	solution-bitwise-and.java

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