Kata Library: Java Practice
Sign Up
Time to claim your honor
Training
Practice
Complete challenging
Kata
to earn honor and ranks. Re-train to hone technique
Freestyle Sparring
Take turns remixing and refactoring others code through
Kumite
Community
Leaderboards
Achieve honor and move up the global leaderboards
Chat
Join our
Discord
server and chat with your fellow code warriors
Discussions
View our
Github Discussions
board to discuss general Codewars topics
About
Docs
Learn about all of the different aspects of Codewars
Blog
Read the latest news from Codewars and the community
Log In
Sign Up
Library
Collections
Newest
Oldest
Popularity
Positive Feedback
Most Completed
Least Completed
Hardest
Easiest
Name
Relevance
Low Satisfaction
All
My Languages
Agda (Beta)
BF (Beta)
C
CFML (Beta)
Clojure
COBOL (Beta)
CoffeeScript
CommonLisp (Beta)
Coq
C++
Crystal
C#
D (Beta)
Dart
Elixir
Elm (Beta)
Erlang (Beta)
Factor (Beta)
Forth (Beta)
Fortran (Beta)
F#
Go
Groovy
Haskell
Haxe (Beta)
Idris (Beta)
Java
JavaScript
Julia (Beta)
Kotlin
λ Calculus (Beta)
Lean
Lua
NASM
Nim (Beta)
Objective-C (Beta)
OCaml (Beta)
Pascal (Beta)
Perl (Beta)
PHP
PowerShell (Beta)
Prolog (Beta)
PureScript (Beta)
Python
R (Beta)
Racket
Raku (Beta)
Reason (Beta)
RISC-V (Beta)
Ruby
Rust
Scala
Shell
Solidity (Beta)
SQL
Swift
TypeScript
VB (Beta)
Approved & Beta
Approved
Beta
All
Kata I have not trained on
Kata I have not completed
Kata I have completed
8 kyu
easiest
7 kyu
6 kyu
5 kyu
4 kyu
3 kyu
2 kyu
1 kyu
hardest
ASCII Art
1
Algebra
3
Algorithms
24
Arrays
204
Binary
4
Bits
2
Ciphers
1
Cryptography
2
Data Science
1
Data Structures
2
Debugging
2
Design Patterns
1
Functional Programming
1
Fundamentals
204
Games
3
Geometry
2
Graph Theory
2
Linear Algebra
3
Lists
29
Logic
3
Mathematics
13
Matrix
6
Number Theory
3
Object-oriented Programming
1
Performance
5
Puzzles
1
Queues
1
Recursion
1
Refactoring
1
Regular Expressions
6
Security
1
Sets
1
Sorting
18
Statistics
1
Strings
42
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
204 Kata Found
8 kyu
Is there a vowel in there?
16,880
PG1
2 Issues Reported
Fundamentals
Strings
Arrays
7 kyu
Product Array (Array Series #5)
10,094
MrZizoScream
2 Issues Reported
Fundamentals
Arrays
6 kyu
Connect Four - placing tokens
562
mmalkavian
Arrays
Fundamentals
7 kyu
Extra Perfect Numbers (Special Numbers Series #7)
7,568
MrZizoScream
1 Issue Reported
Fundamentals
Arrays
8 kyu
Duck Duck Goose
15,573
10XL
2 Issues Reported
Arrays
Lists
Fundamentals
6 kyu
Take a Ten Minutes Walk
208,935
JKphobic
16 Issues Reported
Arrays
Fundamentals
7 kyu
Name Array Capping
9,516
ogryzek
1 Issue Reported
Strings
Arrays
Fundamentals
7 kyu
Sum of Odd Cubed Numbers
11,604
elliottmck
5 Issues Reported
Fundamentals
Functional Programming
Arrays
Beta
Deck & Derby
7
alex.MC
Status:
Testing & feedback needed
Estimated Rank:
6 kyu
Fundamentals
Arrays
6 kyu
Mexican Wave
74,421
adrian.eyre
3 Issues Reported
Arrays
Strings
Fundamentals
8 kyu
Count of positives / sum of negatives
163,782
Dentzil
10 Issues Reported
Fundamentals
Arrays
Lists
8 kyu
Sort and Star
53,143
PG1
2 Issues Reported
Fundamentals
Strings
Arrays
Sorting
8 kyu
Printing Array elements with Comma delimiters
30,391
Javatlacati
4 Issues Reported
Arrays
Fundamentals
8 kyu
Sum Arrays
201,691
richardhsu
3 Issues Reported
Arrays
Fundamentals
7 kyu
The 'spiraling' box
1,987
brodiemark
1 Issue Reported
Arrays
Fundamentals
6 kyu
Frequency Analysis With Buckets
678
ajLapid718
2 Issues Reported
Fundamentals
Arrays
Sorting
7 kyu
Chinese Zodiac
2,227
AcesOfGlory
Fundamentals
Arrays
7 kyu
Partial Word Searching
8,185
obnounce
5 Issues Reported
Arrays
Strings
Fundamentals
8 kyu
Removing Elements
82,740
MorgzC41
1 Issue Reported
Lists
Arrays
Fundamentals
8 kyu
Count the Monkeys!
73,472
PG1
1 Issue Reported
Arrays
Fundamentals
Lists
Algorithms
6 kyu
IntroToArt
921
citharista
1 Issue Reported
Arrays
Strings
ASCII Art
Fundamentals
7 kyu
Sort arrays - 1
16,202
ineiti
1 Issue Reported
Sorting
Arrays
Fundamentals
8 kyu
Remove duplicates from list
39,888
wichu
2 Issues Reported
Fundamentals
Arrays
Lists
6 kyu
Fibonacci, Tribonacci and friends
13,843
GiacomoSorbi
13 Issues Reported
Arrays
Lists
Number Theory
Fundamentals
7 kyu
Looking for a benefactor
10,954
g964
Fundamentals
Arrays
6 kyu
Find the unique number
153,946
isqua
4 Issues Reported
Fundamentals
Algorithms
Arrays
Performance
7 kyu
The Poet And The Pendulum
4,836
MrZizoScream
4 Issues Reported
Fundamentals
Arrays
Algorithms
Performance
7 kyu
Nice Array
7,045
aweleshetu
2 Issues Reported
Arrays
Mathematics
Fundamentals
7 kyu
Array Leaders (Array Series #3)
8,691
MrZizoScream
1 Issue Reported
Fundamentals
Arrays
7 kyu
Max-min arrays
5,330
KenKamau
3 Issues Reported
Arrays
Fundamentals
Loading...
Confirm
Collect:
undefined
Loading collection data...