RummbleAPIWithSignpost is a project mainly written in Java, it's free.
Example code for using Rummble API with Signpost library
An example class to use the Signpost OAuth library to call the Rummble API
The example file provides the ability to:
You will need to signup for an API consumer key at dev.rummble.com first.
The java class needs you to fill in the consumer key and secret.
The src has project settings for the Eclipse development environment.