The library comes with a Swing sample application and a set of classes that goes with. The application itself is SampleApp. To try it, you simply type the follwing command from the main directory:
mvn compile exec:java
Or use this link to start it with WebStart (no download or installation required apart from a Java JRE).
You have first to load maps by selecting a file or a whole directory in the "Open" dialog (CTRL-O). Then, you drag the map to move it and use the scroll-wheel to zoom.