For those new to both Java and Groovy

If you don't already know Java, these pages are for you.

Numerical Processing:

         Groovy Integer Math - choose from many types of integers

         Groovy BigDecimal Math - for high-precision decimal math

         Groovy Floating Point Math - for high-speed decimal math

Collections: 

         Lists and Sets - convenient notation to group items into a collection

         Object Arrays - fixed-size arrays for faster collections

         Maps and Sorted Maps - convenient notation to assign values to keys

Text Processing:

         Characters in Groovy 

         Strings and StringBuffers in Groovy NEW ON 30 APRIL 2007

Data Structures:

         Blocks, Closures, and Functions

         Expandos, Classes, and Categories

Miscellaneous: 

        Using Interceptors with the ProxyMetaClass - intercept calls to methods

        Java Reflection in Groovy - how to examine and manipulate objects and their fields and methods when their names aren't known at compile time.