Add new Java exercises

One of the easiest ways to add new exercises to the Java track is to translate them from other language tracks on Exercism. This page lists all of the problem specifications in the common pool of exercises which have not yet been implemented in Java.

The icon links to the language-independent description of the problem.

The icon links to the canonical test data.

We also link to all the implementations of each exercise in other languages, which you can use for inspiration.

Once you've picked an exercise, follow the instructions in this guide and submit your pull request to the Java track repository on GitHub.

Exercises

About

Examples

React

Implement a basic reactive system.

Alphametics

Write a function to solve alphametics puzzles.

Connect

Compute the result for a game of Hex / Polygon

Tournament

Tally the results of a small football competition.

Dominoes

Make a chain of dominoes.

Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.

Protein Translation

Translate RNA sequences into proteins.

Variable Length Quantity

Implement variable length quantity encoding and decoding.

Proverb

For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

Zipper

Creating a zipper for a binary tree.

Pov

Reparent a graph on a selected node

Diffie Hellman

Diffie-Hellman key exchange.

Grep

Search a file for lines matching a regular expression pattern. Return the line number and contents of each matching line.

Scale Generator

Generate musical scales, given a starting note and a set of intervals.

Two Bucket

Given two buckets of different size, demonstrate how to measure an exact number of liters.

Zebra Puzzle

Solve the zebra puzzle.

Error Handling

Implement various kinds of error handling and resource management

Markdown

Refactor a Markdown parser

Sgf Parsing

Parsing a Smart Game Format string.

Dot Dsl

Write a Domain Specific Language similar to the Graphviz dot language

Go Counting

Count the scored points on a Go board.

Hangman

Implement the logic of the hangman game using functional reactive programming.

Ledger

Refactor a ledger printer.

Lens Person

Use lenses to update nested records (specific to languages with immutable data).

Tree Building

Refactor a tree building algorithm.

Paasio

Report network IO statistics