This is a very convenient way to remove all doubles from a List in Java. The only prerequisite is that the elements in the list have proper equals and hashCode methods.

It work by using the constructor of a Set that takes a Collection as an argument.

I poured the snippet in a little program so can run it straight away.

Using a JGroups ReplicatedHashtable from Groovy

Recursively iterate over folders and files to check for differences.

This is an example from practice. The domain is a whater flow messure system. I wrote a blog entry where I fully described the evolution of this class - in german.

Using the SwingX JXMapViewer and using a special tile factory to retrieve Google Maps tiles, from a Groovy SwingBuilder.

/**
* GOAL: Write a quick-and-dirty DSL in Groovy that emulates Bruce Tate's
* example "acts_as_statemachine" Ruby code at
* http://www-128.ibm.com/developerworks/java/library/j-cb03137/index.html,
* within 20 minutes or less (i.e. steer clear of MOP-magic engineering ;).
*
* For more context, see the Apr'07 "Symbols" thread on the groovy-user mailing
* list.
*/

Try to create a DSL for a finite state machine.

Inspired by Chris vanBuskirk version on this site and the Ruby article at

http://www-128.ibm.com/developerworks/java/library/j-cb03137/index.html

Conway's Game of Life - a solution for GroovyQuiz.com. You can download all of the sources and an executable jar.

A possible implementation of the Sieve of Eratosthenes for generating prime numbers below some limit.

Generate prime numbers blow some limit using the Sieve of Eratosthenes algorithm. This snippet uses some object abstractions to simplify the algorithm.