The class implementing ICoordinateSystemChooser is the view for your coordinate chooser. This is the class that will be displaying the list of coordinate system options to the user, and notifying INTViewer of the user's choice.

There is one method to write in your ICoordinateSystemChooser. This is the display method with the following signature:

 public void display(ICoordinateSystemSelectionListener il)

This method should display the panel for your coordinate system chooser, and when the user has selected a coordinate system, you will pass the string representing the selected coordinate system to the ICoordinateSystemSelectionListener. This is done with the code: li.coordinateSystemSelected(coordinateSystemString);