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
3
Algorithms
163
Arrays
18
Big Integers
1
Binary
2
Ciphers
6
Cryptography
6
Data Structures
5
Date Time
5
Dynamic Programming
1
Filtering
1
Fundamentals
35
Games
4
Geometry
2
Interpreters
2
Language Features
1
Lists
1
Logic
10
Mathematics
16
Matrix
1
Memoization
1
Object-oriented Programming
3
Parsing
16
Performance
5
Permutations
1
Puzzles
9
Queues
1
Recursion
2
Regular Expressions
20
Searching
1
Security
6
Sorting
3
Statistics
1
Streams
1
Strings
163
Trees
1
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
163 Kata Found
4 kyu
Vigenère Cipher Helper
8,870
jacobb
4 Issues Reported
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
6 kyu
FIRE and FURY
1,510
dinglemouse
1 Issue Reported
Regular Expressions
Strings
Algorithms
8 kyu
Neutralisation
12,170
saudiGuy
Algorithms
Strings
6 kyu
Explain the Algebraic Chess Notation
142
Abiyasash3565
Algorithms
Strings
Parsing
6 kyu
Arrh, grabscrab!
7,462
matstc
2 Issues Reported
Strings
Algorithms
6 kyu
Draw a Circle.
296
AJFarmar
1 Issue Reported
Strings
Geometry
ASCII Art
Algorithms
6 kyu
Split Strings
167,959
jhoffner
Regular Expressions
Strings
Algorithms
7 kyu
Replace every nth
4,694
user5036852
Algorithms
Strings
7 kyu
80's Kids #5: You Can't Do That on Television
1,704
NateBrady23
1 Issue Reported
Fundamentals
Algorithms
Strings
Regular Expressions
7 kyu
Email Address Obfuscator
4,594
jaxDid
3 Issues Reported
Strings
Algorithms
6 kyu
Missing Alphabet
1,321
MicheleCarbone
1 Issue Reported
Strings
Algorithms
Games
6 kyu
Nut Farm
1,213
dinglemouse
2 Issues Reported
Strings
Algorithms
5 kyu
First non-repeating character
74,130
OverZealous
4 Issues Reported
Strings
Algorithms
6 kyu
Find a Bunch of Common Elements of Two Lists in a Certain Range
912
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
6 kyu
Estimating Amounts of Subsets
2,269
raulbc777
4 Issues Reported
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
4 kyu
Strip Comments
55,353
jhoffner
17 Issues Reported
Strings
Algorithms
6 kyu
Are we alternate?
5,510
cheeze
Algorithms
Strings
4 kyu
Human readable duration format
86,779
davazp
5 Issues Reported
Strings
Date Time
Algorithms
6 kyu
Convert string to camel case
204,894
jhoffner
20 Issues Reported
Regular Expressions
Algorithms
Strings
6 kyu
Playing with passphrases
11,888
g964
4 Issues Reported
Strings
Algorithms
6 kyu
Moves in squared strings (IV)
1,614
g964
1 Issue Reported
Algorithms
Strings
6 kyu
Hidden "Cubic" numbers
3,192
g964
3 Issues Reported
Algorithms
Strings
4 kyu
Text align justify
8,545
kesheshyan
10 Issues Reported
Strings
Algorithms
7 kyu
Remove consecutive duplicate words
7,776
e.mihaylin
Strings
Regular Expressions
Algorithms
7 kyu
Determine if the poker hand is flush
6,273
CodingWarrior
1 Issue Reported
Arrays
Algorithms
Logic
Strings
Games
7 kyu
Coloured Triangles
11,228
Avanta
Logic
Strings
Algorithms
7 kyu
Reversing Fun
4,748
Shivo
Strings
Fundamentals
Algorithms
6 kyu
Trumpness detector
1,144
GiacomoSorbi
3 Issues Reported
Regular Expressions
Strings
Algorithms
6 kyu
Evil Autocorrect Prank
5,266
yaphi1
3 Issues Reported
Strings
Regular Expressions
Algorithms
4 kyu
Next smaller number with the same digits
11,868
LesRamer
1 Issue Reported
Strings
Mathematics
Algorithms
Loading...
Confirm
Collect:
undefined
Loading collection data...