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Programming Exercise 3 - Randoms, Math, Enums, and Static
Methods
Problem Description
“Water (stay hydrated). Earth (Nave Food). Fire (My mixtape). Air (please shower so it smells nice). Long
ago, the four aspects of freshman life at Georgia Tech lived together in harmony. Then, everything changed
when Georgian Tech leaked our data. Only the Sophomore by credit hours, master of all four aspects, could
save us, but when the world needed her most, she graduated. A few semesters passed and my fellow TA’s
and I discovered a new hope, you! And although your programming skills are great, you have a programming
exercise to complete before you’re ready to save anyone. But I believe you can save the world.”
Using Randoms, Math, Enums, and Static Methods, we will help protect Georgian Tech.
Solution Description
• Create the class
1. Create a class called DataLeakSimulator
• Types of Data Enum
1. Create an enum called SchoolDataType
2. Add the following values to the enum: STUDENTS, CLASSES, HOUSING, DINING (remember to
captialize them)
• NumberParser
1. Create a static method leakData in DataLeakSimulator. It should take an int as a parameter
and return a SchoolDataType value.
2. The method should follow the below process for determining the type of data to leak: 1. Take the
absolute value of the number (using Math.abs)
2. Mod the number in step 1 by 4.
– If the result is 0, return STUDENTS from SchoolDataType
– If the result is 1, return CLASSES from SchoolDataType
– If the result is 2, return HOUSING from SchoolDataType
– If the result is 3, return DINING from SchoolDataType
• Main Method
1. Add a main method to DataLeakSimulator
2. In your main method, create a Random variable called myRandom and assign to it a new Random
object.
3. Generate a int between 0 and 25 (inclusive) using myRandom.nextInt(26).
4. Take the square root of the number generated in step 3 (using Math.sqrt) and cast the result to
an int.
5. Call the leakData method with the number generated in step 4 as a parameter. Print the result
out in the format of “[data type name] data was leaked” with the resulting value.
6. Generate an int between -10 and 10 using Math.random(). The general formula to do this is
(int)(Math.random() * ((Max - Min) + 1) + Min).
7. Call leakData method with the number generated in step 6 and print out “[data type name] data
was leaked” with the resulting value.
Testing your app
This is an example of running the main method from the command line.
--> java DataLeakSimulator
STUDENTS data was leaked
DINING data was leaked
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Allowed Imports
To prevent trivialization of the assignment, you are only allowed to import java.util.Random.
Feature Restrictions
There are a few features and methods in Java that overly simplify the concepts we are trying to teach or
break our auto grader. For that reason, do not use any of the following in your final submission:
• var (the reserved keyword)
• System.exit
Collaboration
Collaboration Statement
To ensure that you acknowledge collaboration and give credit where credit is due, we require that you
place a collaboration statement as a comment at the top of at least one java file that you
submit. That collaboration statement should say either:
I worked on the homework assignment alone, using only course materials.
or
In order to help learn course concepts, I worked on the homework with [give the names of the people you
worked with], discussed homework topics and issues with [provide names of people], and/or consulted related
material that can be found at [cite any other materials not provided as course materials for CS 1331 that
assisted your learning].
Recall that comments are special lines in Java that begin with //.
Turn-In Procedure
Submission
To submit, upload the files listed below to the corresponding assignment on Gradescope:
• DataLeakSimulator.java
• SchoolDataType.java
Make sure you see the message stating “PE03 submitted successfully”. From this point, Gradescope will run
a basic autograder on your submission as discussed in the next section.
You can submit as many times as you want before the deadline, so feel free to resubmit as you make substantial
progress on the homework. We will only grade your last submission: be sure to submit every file each
time you resubmit.
Gradescope Autograder
For each submission, you will be able to see the results of a few basic test cases on your code. Each test
typically corresponds to a rubric item, and the score returned represents the performance of your code on
those rubric items only. If you fail a test, you can look at the output to determine what went wrong and
resubmit once you have fixed the issue.
The Gradescope tests serve two main purposes:
1. Prevent upload mistakes (e.g. forgetting checkstyle, non-compiling code)
2. Provide basic formatting and usage validation
In other words, the test cases on Gradescope are by no means comprehensive. Be sure to thoroughly test
your code by considering edge cases and writing your own test files. You also should avoid using Gradescope
to compile, run, or checkstyle your code; you can do that locally on your machine.
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Other portions of your assignment can also be graded by a TA once the submission deadline has passed, so
the output on Gradescope may not necessarily reflect your grade for the assignment.
Important Notes (Don’t Skip)
• Non-compiling files will receive a 0 for all associated rubric items
• Do not submit .class files.
• Test your code in addition to the basic checks on Gradescope
• Submit every file each time you resubmit
• Read the “Allowed Imports” and “Restricted Features” to avoid losing points
• Check on Piazza for all official clarifications
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