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
Sum Mixed Array
109,162
PG1
1 Issue Reported
Fundamentals
Strings
Arrays
8 kyu
Enumerable Magic #1 - True for All?
13,585
bellmyer
2 Issues Reported
Arrays
Fundamentals
7 kyu
Driving Licence
4,310
adrian.eyre
4 Issues Reported
Strings
Arrays
Fundamentals
8 kyu
Sum Arrays
205,814
richardhsu
4 Issues Reported
Arrays
Fundamentals
6 kyu
Duplicates. Duplicates Everywhere.
2,640
bretcameron
Arrays
Sets
Sorting
Fundamentals
7 kyu
Double Trouble
3,899
PG1
1 Issue Reported
Fundamentals
Arrays
7 kyu
Help the Fruit Guy
8,061
user3028132
3 Issues Reported
Arrays
Strings
Fundamentals
6 kyu
Fruit Machine
3,652
adrian.eyre
1 Issue Reported
Arrays
Games
Fundamentals
6 kyu
Find the unique number
156,141
isqua
3 Issues Reported
Fundamentals
Algorithms
Arrays
Performance
6 kyu
English beggars
9,906
GiacomoSorbi
Queues
Arrays
Lists
Recursion
Fundamentals
8 kyu
Array plus array
92,215
Dmitry Kudla
1 Issue Reported
Fundamentals
Arrays
Debugging
7 kyu
CompoundArray
2,874
Delacroix23
Arrays
Fundamentals
7 kyu
Alternate Square Sum
3,985
hakunaMatata
Fundamentals
Arrays
Lists
8 kyu
Invert values
182,058
user7657844
1 Issue Reported
Lists
Fundamentals
Arrays
8 kyu
Count the Monkeys!
74,518
PG1
1 Issue Reported
Arrays
Fundamentals
Lists
Algorithms
8 kyu
Total amount of points
119,325
petrosernivka
1 Issue Reported
Fundamentals
Arrays
Strings
8 kyu
Count by X
155,072
shums16
Arrays
Fundamentals
8 kyu
Convert a string to an array
158,770
samjam48
3 Issues Reported
Arrays
Strings
Fundamentals
8 kyu
Beginner - Reduce but Grow
171,715
PG1
1 Issue Reported
Fundamentals
Arrays
8 kyu
Sentence Smash
174,953
richardhsu
Strings
Arrays
Fundamentals
7 kyu
Odd or Even?
150,759
ethaning
2 Issues Reported
Fundamentals
Arrays
7 kyu
Ones and Zeros
155,671
user4386369
3 Issues Reported
Fundamentals
Arrays
8 kyu
Beginner - Lost Without a Map
204,344
PG1
3 Issues Reported
Fundamentals
Arrays
8 kyu
Convert number to reversed array of digits
204,254
emporio
Arrays
Fundamentals
8 kyu
Square(n) Sum
309,694
jhoffner
1 Issue Reported
Arrays
Lists
Fundamentals
7 kyu
Matrix Addition of Elements
1,294
S!D
Matrix
Fundamentals
Arrays
Mathematics
7 kyu
Batman Quotes
2,664
afarcilla
2 Issues Reported
Arrays
Fundamentals
8 kyu
Sum of positive
335,452
JbPasquier
Arrays
Fundamentals
7 kyu
Product Array (Array Series #5)
10,275
MrZizoScream
2 Issues Reported
Fundamentals
Arrays
6 kyu
Equal Sides Of An Array
134,596
Shivo
Algorithms
Arrays
Fundamentals
Loading...
Confirm
Collect:
undefined
Loading collection data...