In Groovy we can write classes and write an implementation for methods we don't even know exist. We must implement the method methodMissing() which is invoked when other methods cannot be found.

Demonstration of a few of the different ways to dynamically invoke Groovy code within a Java environment.

The groovy.util package contains the FileNameFinder and FileNameByRegExFinder classes. We can use the FileNameFinder classe to search recursively for files in a directory with ANT fileset pattern conventions. With the FileNameByRegExFinder we use regular expressions to define the file patterns.