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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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