Stuck on that homework assignment involving SortDetective.jar? No need to worry!
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Created
This tutorial is “certifiably” Mac Friendly. Whoop.
Files Provided To You

SortDetective.jar
, which looks something like this:
The purpose of this little HW assignment is to correctly identify the 6 Greek letters (Alpha, Beta, Gamma, Delta, Epsilon, & Zeta) with their matching sorting method (selection, insertion, bubble, quick, merge, & heap sort).
Step 1  Download JDGUI
Head over to the Java Decompiler page located at jd.benow.ca
) and download the ZIP
file for the JDGUI
.
Step 2  Launch JDGUI
Now that you’ve downloaded the ZIP
file, unzip it and launch the application.
Step 3  Open your SortDetective.jar
file using JDGUI
Step 4  Find the Formula That Determines The Order
SortDetective.jar
determines the sorting method ordering according to your student ID.
It has an array defined with 5 different orders that the sorting methods CAN be placed in. See Line 256
in the SortDetective.class
.
Zooming in…
With some minor searches, we find out that the method experimentOrders
uses the variable selectedPermutation
to determine what array value it will use to determine the order.
This redirects us to the setStudentID()
method. So now we’ve figured out the ordering all just depends on the formula the program uses.
Step 5  Apply Formula To experimentOrders
So, in my case, my student ID is 00319124
.
Using the formula, we can determine that the value of selectedPermutation
is going to be 2
for me since 319124
/ 10
% 5
= 2.4
or simply 2
for int
. That means that the array value for experimentOrders
will be 2
, making a match to the order found on Line 7
when zooming in to Line 256
in SortDetective.class
.
Remember, arrays are ordered like {0,1,2}
. So experimentOrders[2]
would be the 3rd value in the array.
There we go! Just like that, I now know for sure that the ordering of the Greek letters for me would go
 Alpha  Quick Sort
 Beta  Selection Sort
 Gamma  Merge Sort
 Delta  Bubble Sort
 Epsilon  Insertion Sort
 Zeta  Heap Sort
Good luck with your HW!
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