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
16
Arrays
2
Fundamentals
9
Games
1
Interpreters
2
Logic
2
Mathematics
4
Object-oriented Programming
1
Parsing
21
Recursion
2
Strings
21
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
21 Kata Found
6 kyu
Explain the Algebraic Chess Notation
121
Abiyasash3565
Algorithms
Strings
Parsing
5 kyu
Four Letter Words ~ Mutations
653
rowcased
Strings
Arrays
Games
Parsing
Algorithms
4 kyu
Simplexer
746
Mihail-K
3 Issues Reported
Strings
Parsing
Algorithms
6 kyu
Parse HTML/CSS Colors
2,769
junthecoder
2 Issues Reported
Fundamentals
Algorithms
Strings
Parsing
5 kyu
Molecule to atoms
6,021
romanzes
3 Issues Reported
Parsing
Algorithms
Strings
7 kyu
Correct the time-string
5,338
user5036852
3 Issues Reported
Parsing
Strings
Fundamentals
7 kyu
Valid Parentheses
9,027
Kacarott
Strings
Parsing
Algorithms
6 kyu
Reverse polish notation calculator
11,487
vgrichina
4 Issues Reported
Algorithms
Mathematics
Interpreters
Parsing
Strings
4 kyu
parseInt() reloaded
18,727
BattleRattle
7 Issues Reported
Parsing
Strings
Algorithms
8 kyu
Convert a String to a Number!
287,692
bkaes
Parsing
Strings
Fundamentals
5 kyu
Reverse Inside Parentheses (Inside Parentheses)
618
dmercertaylor
1 Issue Reported
Strings
Fundamentals
Recursion
Parsing
5 kyu
Convert A Hex String To RGB
15,924
Krxtopher
Parsing
Strings
Algorithms
Beta
Crude Machinery and a Command Line Interface
8
oson
1 Issue Reported
Status:
Testing & feedback needed
Strings
Parsing
Algorithms
6 kyu
Music Fun #1 - Major Scale
258
smokinhiro
Algorithms
Strings
Parsing
Logic
Fundamentals
5 kyu
Formatting simple HTML
50
JohanWiltink
Fundamentals
Algorithms
Strings
Parsing
5 kyu
Japanese Romaji-to-Hiragana Converter
115
ewingsa
Logic
Strings
Parsing
Fundamentals
6 kyu
Word Segmentation: MaxMatch
777
ewingsa
1 Issue Reported
Parsing
Recursion
Strings
Arrays
Algorithms
7 kyu
Large sum
330
fraflei
Strings
Parsing
Fundamentals
Beta
Calculator for expressions with fractions
5
_mer_
1 Issue Reported
Status:
Waiting for issues to be resolved
Estimated Rank:
2 kyu
Object-oriented Programming
Strings
Mathematics
Parsing
Algorithms
Beta
Advanced Calculator!
13
Toderesa97
1 Issue Reported
Status:
Waiting for issues to be resolved
Estimated Rank:
2 kyu
Mathematics
Fundamentals
Algorithms
Parsing
Strings
Beta
Sparkle Interpreter
13
Mihail-K
3 Issues Reported
Status:
Waiting for issues to be resolved
Estimated Rank:
1 kyu
Parsing
Interpreters
Strings
Mathematics
Algorithms
Confirm
Collect:
undefined
Loading collection data...