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question

I made a 48 x 48 gif file which can be downloaded and placed in the same folder as your class files.

StockpileCritter.gif

StockpileCritter.java

import info.gridworld.actor.*;
import info.gridworld.grid.*;
import java.util.ArrayList;

/**
 * @author Chris Thiel
 * @version 11 May 2009
 */
public class StockpileCritter extends Critter
{
    private int stockpile;
    public StockpileCritter()
    {
        stockpile=0;
    }
    /**
     * getStockpile returns the number in
     * the stockpile and is not necesary
     * for a solution, but is here to 
     * see if your solution is working 
     * properly
     */
    public int getStocpile()
    {
        return stockpile;
    }

    public void processActors(ArrayList<Actor> actors)
    {
       stockpile+=actors.size();
       for (Actor a : actors) a.removeSelfFromGrid();
    }
    public void makeMove(Location loc)
    {
      stockpile--;
      if (stockpile == 0 || loc==null)
           removeSelfFromGrid();
      else moveTo(loc);
    }

}

StockpileCritterRunner

import info.gridworld.actor.*;
import info.gridworld.grid.*;

import java.awt.Color;

/**
 * This class runs a world that contains critters. 

 * This class is not tested on the AP CS A and AB exams.
 */
public class StockPileCritterRunner
{
    public static void main(String[] args)
    {
        ActorWorld world = new ActorWorld();
        world.add(new Location(0, 1), new Rock());
        world.add(new Location(1, 3), new Rock());
        world.add(new Location(2, 1), new Flower(Color.BLUE));
        world.add(new Location(2, 2), new StockpileCritter());
        world.add(new Location(2, 3), new Rock());
        world.add(new Location(5, 3), new Flower(Color.RED));
        world.show();
    }
}