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
- ClimbingClub Free Response Solution
- HorseBarn Free Response Solution
- GrayImage Free Response Solution
Help & comments
Get help from AP CS Tutor Brandon Horn