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
Algorithms
1
Arrays
3
Concurrency
1
Debugging
37
Fundamentals
10
Language Features
2
Mathematics
1
Object-oriented Programming
1
Performance
1
Puzzles
1
Regular Expressions
1
Strings
1
Threads
1
Unicode
1
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
37 Kata Found
8 kyu
Array plus array
91,571
Dmitry Kudla
1 Issue Reported
Fundamentals
Arrays
Debugging
8 kyu
Multiply
5,550,176
11 Issues Reported
Debugging
Fundamentals
6 kyu
FIXME: Hello
2,933
dinglemouse
Debugging
8 kyu
Filtering even numbers (Bug Fixes)
7,953
aryan-firouzian
Fundamentals
Debugging
8 kyu
Grasshopper - If/else syntax debug
41,594
danleavitt0
1 Issue Reported
Debugging
7 kyu
Thinkful - String Drills: Quotable
6,490
Grae-Drake
1 Issue Reported
Debugging
5 kyu
The Spider and the Fly
127
dinglemouse
Debugging
Algorithms
8 kyu
String Templates - Bug Fixing #5
22,817
matt c
2 Issues Reported
Strings
Debugging
8 kyu
Unfinished Loop - Bug Fixing #1
48,984
matt c
Debugging
7 kyu
FIXME: Get Full Name
11,362
dinglemouse
Debugging
8 kyu
Floating point comparison
7,569
mauro-1
Fundamentals
Mathematics
Debugging
6 kyu
Round and Round
1,036
Voile
Fundamentals
Debugging
8 kyu
A + B
8,322
ZhulanovAA
1 Issue Reported
Fundamentals
Debugging
7 kyu
[BUG] XCOM-241: Genome mapper freezes
73
hobovsky
Debugging
Performance
8 kyu
Swap Values
25,979
dnolan
3 Issues Reported
Debugging
Arrays
Fundamentals
8 kyu
101 Dalmatians - squash the bugs, not the dogs!
28,291
PG1
1 Issue Reported
Debugging
Fundamentals
8 kyu
FIXME: Replace all dots
33,103
dinglemouse
Debugging
Regular Expressions
8 kyu
Basic variable assignment
48,083
Ira
1 Issue Reported
Debugging
8 kyu
Get Planet Name By ID
76,327
jhoffner
4 Issues Reported
Debugging
8 kyu
Jenny's secret message
113,721
bkaes
3 Issues Reported
Debugging
8 kyu
Weird Java Array
794
trashy_incel
Debugging
Puzzles
Language Features
7 kyu
Java: Generic Inheritance
217
trashy_incel
Debugging
Language Features
Object-oriented Programming
7 kyu
More than Zero?
2,836
ethanhan2013
Debugging
8 kyu
FIXME: Static electrickery
1,694
dinglemouse
Debugging
8 kyu
Unexpected parsing
13,709
Uraza
Debugging
7 kyu
Debug Sum of Digits of a Number
10,122
Fosna
Debugging
Fundamentals
8 kyu
Grasshopper - Debug
25,492
danleavitt0
1 Issue Reported
Debugging
8 kyu
How do I compare numbers?
9,467
Unnamed
Fundamentals
Debugging
8 kyu
Ghost code?!
3,615
Javatlacati
Unicode
Debugging
7 kyu
FIXME: 1, 2, 3, 4
250
dinglemouse
Debugging
Loading...
Confirm
Collect:
undefined
Loading collection data...