StockpileCritter free response answer

The StockpileCritter problem from the 2009 AP Computer Science Exam is typical of free response problems that test GridWorld: The AP Computer Science Case Study. The problem requires you to extend the Critter class, determine which methods to override, and implement the entire subclass.

StockpileCritter

public class StockpileCritter extends Critter
{
  private int stockpile = 0;
  
  public void processActors(ArrayList<Actor> actors)
  {
    for(Actor a : actors)
    {
      a.removeSelfFromGrid();
      stockpile++;
    }
    
    stockpile--;
  }
  
  public Location selectMoveLocation(ArrayList<Location> locs)
  {
    if(stockpile < 0)
      return null;
    else
      return super.selectMoveLocation(locs);
  }
}

Review the StockpileCritter free response problem with AP CS Tutor Brandon Horn.