Hi i am chio 

i interested in Geotool. 

i follow tutorial http://docs.geotools.org/latest/userguide/tutorial/quickstart/netbeans.html

my work is about calculate shoreline change rate. 

i import shp file shoreline in the program. 

and next how can i add button for calculate shoreline change rate. 

and if i import 2 shoreline for calculate shoreline change rate 

how can i programming it?  please help me. 

thank you in advance. 

best regard; 

chio