import info.gridworld.actor.Actor; import info.gridworld.actor.Critter; import info.gridworld.grid.Grid; import info.gridworld.grid.Location; import info.gridworld.actor.Rock; import java.awt.Color; import java.util.ArrayList; public class RockHound extends Critter { public void processActors(ArrayList actors) { for(Actor a : actors) { if((a instanceof Rock) && !(a instanceof Critter)) a.removeSelfFromGrid(); } } }