Computer Science 161
Laboratory Session # 4
Thursday, Nov. 13
Part I: A laboratory exercise on main programs and a new way of
submitting programs.
Begin by creating a new Java project (call it Hello) and a new class (Hello).
Do nothing to the class defined in the template (i.e., do not change anything in
the class definition provided), but add to the end of the class definition
(before the final '}') a public static void main(String[] args) as follows:
public static void main(String[] args)
{
System.out.println("Hello, world!");
}
Run it to make sure that everything is working.
Now we need to set some Java preferences (it is possible that you may need to
do this on every machine you use, but I'm not sure of that).
- Begin by going to Tools -> Preferences -> Extensions from the main Java
window
- If your name does not turn up, enter it along with your email address.
- Add the server name: smtp.ups.edu (note change: not
mail.ups.edu)
- I have added my username, but I am not certain that this is required.
It works if you enter your username in the 'Name:' box.
- Leave everything else as is. Click on OK
You should only need to do this once (but you may need to do this once for
each machine you use).
- Go to the handouts folder for this class on Hedwig, and locate a file
called submission.defs. Copy this into the folder with the name
of your project (you will need to do this for each project from now on).
You can also pick up a copy of this file by clicking
this link and saving the file in your project
directory (I'll be doing this step in the lab as a demo Thursday if
you have any problems with it).
- Now go to the Tools menu item in the Java window. Make sure that
Hello is still there. Select the bottom-most option, Submit.
If you are running BlueJ on some system (like a Mac) other than Windows, you
may need to close the BlueJ project and re-open it before doing this.
- A Submitter window should appear (notice how much these forms which
appear have the appearance of the JOptionPane class we have been looking
at). Click on Browse. A Select Submission Scheme
should appear.
- Select the line (there should be only one) with CMPU 161a (MTThF at
11:00), and click OK
- The Select Submission Scheme window should disappear, bring back the
Submitter dialog box. Click Submit..
- You will be given the option of adding a message. Do so if you
want - it is not necessary.
- Clicking OK (as I have set things up), will bring up yet another dialog
box asking for your password. Enter your usual password and click OK
- The Submitter window should indicate that "All seems ok."
- This sends me a JAR (zip) file with all your files, and I should be able
to run your program and view your source files from it.
When you try this out (at least for the first time), I will send you a note
saying that I have received your Hello file.
Try this out! We will use this scheme from now on (after this Tuesday,
anyway) for submitting programs. Many thanks to Brad Richards for pointing
out this neat scheme for submitting programs and clearing up points in it!
Exercise (to be due next Wednesday, November 19). Using a copy
of your latest inventory program, modify it as follows:
- Take out all of the JOptionPane stuff (make sure you are doing this in a
copy of your latest inventory project - we will put the JOptionPane stuff
back in (and more!) for the exercise following this.
- Add a main program (as in HashMapExample) to serve as a test driver.
The test driver should add 3 - 4 parts to the HashMap, list them out, delete
one, and list out the resulting list. Each test should be accompanied
by a suitable message (use System.out.println for all printed messages).
- Convert the ArrayList to a HashMap.
- Modify the listing routine to use only the for loop discussed in
class.
- The test driver should add 3 - 4 parts to the HashMap, list them out,
delete one, and list out the resulting list. Each test should be
accompanied by a suitable message (use System.out.println for all printed
messages).
- Following the steps above, submit your project using the Tools -> Submit
option. I will send you a reply acknowledging the receipt of your
project.
Please note: Since I will be responsible for unpacking, printing files,
and running your project it may take a few extra days to get your graded
projects back to you.