- 1.
- Start with a clean copy of the Snowperson assignment. You can
use my solutions if you want or
you can use your own.
http://rocky.colby.edu/cs151/solutions/hw4/
If you use your solution, you might want to take a minute to review
it, make sure you remember how it works, and clean it up a little.
- 2.
- Add a few lines of code to the program and experiment with
Rectangle and Point objects a bit. Try out one or two of the
examples from the book or Quiz 12. Try creating an object
variable (but no object) and then access one of the instance
variables. What happens? Look at the output from the exception
handler and see if you can find the line of the program that
caused the error.
- 3.
- Modify the Snowperson code so that every method that receives
a bounding box as an argument gets a single Rectangle object instead
of four integers. For example, the declaration of paintSnowperson
would look like
public void paintSnowperson (Graphics g, Rectangle bb)
- 4.
- Please turn in a paragraph that
compares the two versions, discussing things like readability,
debuggability, code length and encapsulation.
In the Java library, they had the option of using Rectangles to pass
parameters to methods like drawRect and drawOval, but they chose to
pass four integers instead. In fact, there are only a couple of
methods in the whole Java library that use Rectangles at all. What do
you think of this decision? Would you prefer a version of drawOval
that takes a single Rectangle as an argument? What if you could have
both?
