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
Algebra
2
Algorithms
60
Arrays
2
Data Structures
11
Dynamic Programming
1
Fundamentals
60
Games
1
Geometry
6
Logic
11
Mathematics
60
Matrix
1
Parsing
1
Performance
2
Puzzles
2
Restricted
1
Sorting
1
Strings
8
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
60 Kata Found
6 kyu
Help Kiyo きよ solve her problems LCM Fun!
499
user8476848
Algorithms
Data Structures
Mathematics
Fundamentals
6 kyu
Find a Bunch of Common Elements of Two Lists in a Certain Range
912
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
8 kyu
Keep Hydrated!
233,390
paulrichard
Algorithms
Mathematics
Fundamentals
6 kyu
Remove a Specific Element of an Array
952
raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
6 kyu
Reach Me and Sum my Digits
3,374
raulbc777
Fundamentals
Algorithms
Mathematics
6 kyu
Estimating Amounts of Subsets
2,269
raulbc777
4 Issues Reported
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
Strings
5 kyu
Tri-Bicolor Tiling
171
Bubbler
Fundamentals
Algorithms
Mathematics
6 kyu
Triangles made of random points
240
Muchacos
Mathematics
Geometry
Algorithms
Arrays
Performance
Fundamentals
6 kyu
When Sigma1 Function Has Equals Values For an Integer and Its Reversed One
292
raulbc777
Mathematics
Algorithms
Fundamentals
6 kyu
Tortoise racing
32,600
g964
Fundamentals
Mathematics
Algorithms
6 kyu
Pentabonacci
2,197
raulbc777
4 Issues Reported
Fundamentals
Mathematics
Algorithms
Performance
Dynamic Programming
5 kyu
Numbers that are a power of their sum of digits
2,123
raulbc777
3 Issues Reported
Algorithms
Mathematics
Sorting
Data Structures
Fundamentals
5 kyu
Numbers and its Reversal Having Same Prime Factors.
663
raulbc777
4 Issues Reported
Fundamentals
Algorithms
Mathematics
6 kyu
How Many Numbers?
1,084
raulbc777
5 Issues Reported
Fundamentals
Algorithms
Mathematics
Data Structures
5 kyu
How Many Numbers? II
1,377
raulbc777
3 Issues Reported
Algorithms
Data Structures
Mathematics
Fundamentals
5 kyu
Emirps
2,042
raulbc777
5 Issues Reported
Fundamentals
Mathematics
Algorithms
Data Structures
6 kyu
A Rule of Divisibility by 13
16,098
g964
2 Issues Reported
Fundamentals
Algorithms
Mathematics
4 kyu
How many numbers III?
4,524
raulbc777
4 Issues Reported
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
7 kyu
Count all the sheep on farm in the heights of New Zealand
8,163
jayyv
1 Issue Reported
Fundamentals
Mathematics
Algorithms
Algebra
5 kyu
Compute the Largest Sum of all Contiguous Subsequences
1,175
LesRamer
Mathematics
Fundamentals
Algorithms
7 kyu
Help your fellow warrior!
1,102
faiakismk
2 Issues Reported
Fundamentals
Mathematics
Algorithms
7 kyu
Match My Husband
1,408
SavageWilliam
3 Issues Reported
Fundamentals
Mathematics
Algorithms
6 kyu
Perimeter of Fibonacci Rectangle
385
natehart
Algorithms
Mathematics
Fundamentals
6 kyu
These aren't the numbers you're looking for! (Find a number by approximation)
527
user5036852
Fundamentals
Logic
Mathematics
Algorithms
4 kyu
Decimal to any Rational or Irrational Base Converter
890
GiacomoSorbi
2 Issues Reported
Mathematics
Fundamentals
Algorithms
6 kyu
Pure odd digits primes
1,048
raulbc777
4 Issues Reported
Fundamentals
Algorithms
Mathematics
Data Structures
6 kyu
Special Multiples
1,349
raulbc777
6 Issues Reported
Mathematics
Algorithms
Fundamentals
7 kyu
EAN Validation
2,604
SithFire
1 Issue Reported
Algorithms
Fundamentals
Mathematics
Strings
6 kyu
Points in the circle
2,079
hubencu_st
1 Issue Reported
Geometry
Algorithms
Logic
Mathematics
Fundamentals
7 kyu
MOD 256 without the MOD operator
3,268
user5036852
3 Issues Reported
Algorithms
Fundamentals
Logic
Mathematics
Restricted
Puzzles
Loading...
Confirm
Collect:
undefined
Loading collection data...