// One possible solution appears below.
public class Ferret extends Critter {
    private int infectCount;
    private Random r;
    
    public Ferret() {
	r = new Random();
    }
    
    public Action getMove(CritterInfo info) {
	if (infectCount > 0) {
	    infectCount--;
	}
	if (info.getFront() == Neighbor.OTHER) {
	    infectCount = 5;
	    return Action.INFECT;
	} else if (info.getFront() == Neighbor.EMPTY) {
	    return Action.HOP;
	} else {
	    int choice = r.nextInt(2);
	    if (choice == 0) {
		return Action.LEFT;
	    } else {
		return Action.RIGHT;
	    }
	}
    }
    
    public Color getColor() {
	if (infectCount > 0) {
	    return Color.RED;
	} else {
	    return Color.BLUE;
	}
    }
    
    public String toString() {
	return "I=" + infectCount;
    }
}