CMSI 182
IN T R O D U C T I O N T O CO M P U T E R SC I E N C E
Fall 2006
Assignment 1130
The purpose of this assignment is mainly to give you a taste of a more conventional programming model
— the edit-compile-execute cycle. For this exercise, we will use the Java programming language. Despite
the name similarity, Java and JavaScript are actually significantly different from each other.
Not for Submission
We have selectively covered material from Chapters
6 and 8 from the Brookshear book. If you are un-
able to read through these chapters in their entirety,
then focus on Sections 6.1, 6.2, 6.4, and 8.1.
Not for Submission (Yet)
A quick head’s up — your programming portfolio
is due on December 14, in approximately 3 weeks.
It will consist of fixed-up, improved, and overall
better versions of the following assignments:
•Assignment 1019 (the Web pages)
•Assignment 1026, with all three algorithms now
“packaged” within standalone Web pages
•Assignment 1121, also with the three JavaScript
algorithms within standalone Web pages
Now is a good time to start reviewing your work,
making improvements (especially if I marked it up
previously), and generally putting your personal
stamp on these pages and programs.
For Submission
The provided Mystery.java program contains two
algorithms, named mystery1 and mystery2, respec-
tively, that take a piece of text and produce another
piece of text (or string) as a result. You are asked
to figure out, through a combination of reading
the source code and running the program, what
exactly these algorithms do.
You will need the Java Development Kit (JDK) for
this assignment. Check the Java Crib Sheet handout
for detailed instructions on downloading, installing,
and using the JDK.
1. Type in the Myster y.java program that was given
out in class. Try to be as exact as possible —
the slightest divergence may result in errors.
2. Compile the program (again refer to the Java
Crib Sheet for details); you should now see a file
called Mystery.class.
3. Run the program by entering java Mystery from
the command line. You need to add two items
to the command invocation after java Mystery:
• Specify 1 or 2 to indicate whether you want
to perform mystery1 or mystery2.
• Follow the 1 or 2 with the double-quoted
text that you wish to use as input into the
algorithm. For example, java Mystery 1 “hello
world” will perform myster y1 on hello world; java
Mystery 2 “the quick brown fox” will perform
mystery2 on the quick brown fox.
• In case you forget, java Mystery by itself
should print a help message.
• Mystery will then respond with the result of
the algorithm — do this as many times as
you wish; experiment with different strings,
particularly those with 2 or more words.
4. On hardcopy, state what each algorithm does,
and provide “transcripts” of your interactions
from the command line (a straight copy-paste
into your submission will do) to show that you
successfully compiled and ran the program.
Getting a program up and running in Java requires
a bit more of a learning curve than JavaScript did,
so don’t hesitate to ask if you get stuck.
