RetroBug free response answer 2012

The RetroBug problem from the 2012 AP Computer Science Exam tests your understanding of inheritance by asking you to extend the Bug class from the GridWorld Case Study.

RetroBug is #2 from the 2012 AP Computer Science A Free Response.

https://secure-media.collegeboard.org/apc/ap_frq_computerscience_12.pdf

RetroBug class

public class RetroBug extends Bug
{
    private Location prevLoc;
    private int prevDir;

    public void act()
    {
        prevLoc = getLocation();
        prevDir = getDirection();

        super.act();
    }

    public void restore()
    {
        if(prevLoc != null)
        {
            setDirection(prevDir);

            Actor atPrev = getGrid().get(prevLoc);
            if(atPrev == null || atPrev instanceof Flower)
                moveTo(prevLoc);
        }
    }
}

2012 AP CS Exam Free Response Solutions

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