Sample Code: ThreadedGraphBot.java

package examples;
import becker.robots.*;

/** Extend the GraphBot class to create a new kind of robot that will
    make a graph while executing in a thread, allowing other robots to
    work "simultaneously". */
public class ThreadedGraphBot extends GraphBot implements Runnable
{
   /** Construct a new threaded graphing robot. */
   public ThreadedGraphBot(City aCity, int anAvenue, int aStreet, int aDirection)
   {  super(aCity, anAvenue, aStreet, aDirection);
   }

   public void run()
   {  this.makeGraph();
   }
}