For use, see comments in the java code on where you should plug in the
search routines (the actions for the buttons).     

The GUI compiles on any java compiler and works but does nothing except 
lets you choose the initial situation and press the buttons.  

This is example code only. Make the appropriate modifications to fit the 
homework. Also, you're *not* required to use this code; you are free to 
use your own gui code.