import edu.kzoo.grid.display.DisplayMap;
import edu.kzoo.grid.display.ScaledImageDisplay;
import edu.kzoo.grid.gui.GridAppFrame;
import edu.kzoo.grid.gui.GridPkgFactory;
import edu.kzoo.grid.gui.nuggets.BasicHelpMenu;

import edu.kzoo.util.Debug;

public class MysteryApp
{

    public static void main(String[] args)
    {
        Class[] controllers = { SlowController.class };

        // Create and show the window containing the graphical user interface.
        GridAppFrame window = new MysteryGUI(controllers);

        window.includeMenu(new BasicHelpMenu("MysteryApp", "Your Name Here",
                                "with assistance from (whom?)",
                                "version date", "file:MysteryApp.html"));

        window.constructWindowContents("MysteryApp Program", null, 0, 0, 0);
    }
}

======= THIS SHOULD BE IN A SEPARATE FILE =======

import java.util.ArrayList;

import edu.kzoo.grid.Grid;
import edu.kzoo.grid.GridObject;
import edu.kzoo.grid.Location;

public class SlowController extends MysteryController
{
    private boolean stepDidSomething;

    public SlowController()
    {
        super();
        stepDidSomething = false;
    }

    /** Advances the application one step. */
    public void step()
    {
        // Note that a new step is beginning, controlled by this controller.
        setController(this);    // inherited method
        stepDidSomething = false;  // no activity in this step yet!

        Grid g = getGrid();
        for ( int row = 0; row < g.numRows(); row++ )
            for ( int col = 0; col < g.numCols(); col++ )
            {
                GridObject obj = g.objectAt(new Location(row, col));
                if ( obj != null )
                    obj.act();
            }
    }

    /** Takes note of the fact that something happened.
     */
    public void note(GridObject newObj)
    {
        stepDidSomething = true;
    }

    /** Determines whether a running application has reached
     *  a desired stopping state.
     *    @return <code>true</code> if the application should stop 
     **/
    public boolean hasReachedStoppingState()
    { 
        return ! stepDidSomething;
    }
}

======= THIS SHOULD BE IN A SEPARATE FILE =======

import edu.kzoo.grid.GridObject;
import edu.kzoo.grid.Location;
import edu.kzoo.util.Debug;

public class MysteryGridObject extends GridObject
{

    public void act()
    {
        Location something = getSomething();
        doIt(something);
    }

    protected Location getSomething()
    {
        int currentRow = location().row();
        int currentCol = location().col();
        return new Location(currentRow+1, currentCol);
    }

    protected void doIt(Location newLoc)
    {
        if ( ! grid().isEmpty(newLoc) )
            return;

        GridObject dupl = new MysteryGridObject();
        grid().add(dupl, newLoc);

        appController.getController().note(dupl);
    }
}