Conexion de una base de datos de PostgreSql 8.2 a Java

The method 'removeDoubles' uses a HashSet to remove double elements from a list without creating another list. The first occurrences of the multiple elements are kept, others will be removed. The order of the list will be preserved. The parameter list's iterator must support remove. Example of use is given in the main-method.

Search file directory (recursive method) with java language

Convert InputStream to byte[]

Convert java.awt.Canvas to java.awt.image.BufferedImage

Snippet for display one frame in full screen mode.

From a tutorial on building an RSS SAX parser on my website:

full article can be found here

Convert
java.awt.Canvas to java.awt.image.BufferedImage or java.awt.image.Image

I like to have these two methods in my toolbelt, even though it's syntactic sugar, I think it aids clarity.

A GroovyClassLoader demonstration. The given domain is a german water flow meter system; I think, you shouldn't be able to understand the domain, but you should be able to understand, how to load a Groovy class in Java via a GroovyClassLoader.