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
23
Arrays
38
Binary
3
Binary Trees
2
Bits
1
Combinatorics
1
Data Structures
9
Dynamic Programming
1
Filtering
1
Functional Programming
8
Fundamentals
54
Games
1
Graph Theory
2
Linear Algebra
2
Linked Lists
1
Lists
76
Mathematics
7
Matrix
2
Monads
1
Number Theory
2
Performance
1
Puzzles
3
Queues
2
Recursion
1
Refactoring
1
Sorting
4
Strings
2
Trees
2
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
76 Kata Found
5 kyu
Divide and maximize
232
AveragePythonEnjoyer
1 Issue Reported
Puzzles
Lists
Arrays
Mathematics
8 kyu
Count of positives / sum of negatives
160,929
Dentzil
10 Issues Reported
Fundamentals
Arrays
Lists
8 kyu
Removing Elements
81,822
MorgzC41
1 Issue Reported
Lists
Arrays
Fundamentals
8 kyu
Count the Monkeys!
72,689
PG1
1 Issue Reported
Arrays
Fundamentals
Lists
Algorithms
8 kyu
Remove duplicates from list
39,444
wichu
2 Issues Reported
Fundamentals
Arrays
Lists
Beta
Transforming Chess Piece
16
brodiemark
Status:
Awaiting approval
Estimated Rank:
6 kyu
Games
Lists
Arrays
6 kyu
Fibonacci, Tribonacci and friends
13,768
GiacomoSorbi
13 Issues Reported
Arrays
Lists
Number Theory
Fundamentals
7 kyu
Sort by binary ones
1,164
guumaster
Arrays
Lists
Algorithms
Sorting
Binary
Bits
8 kyu
Add Length
37,721
debri
Arrays
Lists
Fundamentals
7 kyu
The Solar System - Jumbled Planets
243
shreedave
Lists
6 kyu
Reducing by steps
4,504
g964
3 Issues Reported
Mathematics
Arrays
Functional Programming
Lists
Data Structures
7 kyu
Parts of a list
17,855
g964
1 Issue Reported
Arrays
Lists
Data Structures
Algorithms
7 kyu
Pokerhand, straight or not?
597
gundii
2 Issues Reported
Algorithms
Lists
7 kyu
Sum of differences between products and LCMs
1,833
GiacomoSorbi
2 Issues Reported
Arrays
Lists
Fundamentals
6 kyu
English beggars
9,584
GiacomoSorbi
1 Issue Reported
Queues
Arrays
Lists
Recursion
Fundamentals
6 kyu
Simple Fun #170: Sum Groups
1,085
myjinxin2015
2 Issues Reported
Arrays
Algorithms
Lists
Data Structures
7 kyu
Queue time counter
1,712
GiacomoSorbi
Queues
Lists
Algorithms
5 kyu
Josephus Survivor
16,790
GiacomoSorbi
1 Issue Reported
Mathematics
Combinatorics
Algorithms
Lists
Arrays
6 kyu
Tribonacci Sequence
160,587
GiacomoSorbi
7 Issues Reported
Number Theory
Arrays
Lists
Fundamentals
7 kyu
ORing arrays
1,730
GiacomoSorbi
1 Issue Reported
Arrays
Lists
Binary
Fundamentals
5 kyu
Maximum subarray sum
83,507
knotman90
3 Issues Reported
Algorithms
Lists
Dynamic Programming
Fundamentals
Performance
7 kyu
intTunes
504
cmistrata
1 Issue Reported
Arrays
Lists
Fundamentals
Algorithms
7 kyu
Conference Traveller
1,525
msachi
1 Issue Reported
Fundamentals
Arrays
Lists
7 kyu
Closest to Zero
1,801
coffman_21
Lists
Fundamentals
7 kyu
Describe a list
1,665
wichu
4 Issues Reported
Lists
Fundamentals
6 kyu
Fun with lists: map
1,697
janitormeir
Lists
Functional Programming
Fundamentals
4 kyu
Burrows-Wheeler-Transformation
2,042
muesli4
Lists
Puzzles
Algorithms
6 kyu
Sum of prime-indexed elements
2,845
KenKamau
1 Issue Reported
Lists
Fundamentals
8 kyu
Grasshopper - Array Mean
29,488
danleavitt0
2 Issues Reported
Arrays
Lists
Fundamentals
6 kyu
Delete occurrences of an element if it occurs more than n times
100,275
JustyFY
3 Issues Reported
Lists
Fundamentals
Loading...
Confirm
Collect:
undefined
Loading collection data...