Revision 1.0
Overview This assignment builds on Assignment 1 and will extend your practical experience developing a
Java program, including a GUI. Additionally, you must develop and submit JUnit tests for some of the classes
in the implementation. You are encouraged to write tests for all your classes and for the GUI part of your
implementation as well, but you do not have to submit these. You will be assessed on your ability to
• implement a program that complies with the specification,
• develop JUnit tests that can detect bugs in class implementations,
• and develop code that conforms to the style conventions of the course.
Task In this assignment, you will modify and extend the SheeP spreadsheet application from Assignment 1.
You will be provided with an extended version of a working implementation of SheeP in which the GUI is
implemented using the Java Swing library. For the first part of this assignment, you will have to implement
a new GUI that uses the JavaFX library, without altering the look and feel of the user interface. You then
have to extend the functionality of SheeP in two ways: (1) provide support for two built-in functions MEAN and
MEDIAN that calculate the arithmetic mean and median of a list of expressions, including an updated parser,
and (2) provide a menu with options to Save the current spreadsheet in a pre-defined format to a file and Open
a previously saved spreadsheet. In addition, you will be required to develop JUnit test cases for the classes that
implement the MEAN and MEDIAN functionality and for the ComplexScanner class that has been provided to you.
Common Mistakes Please carefully read Appendix A. It outlines common and critical mistakes which you
must avoid to prevent a loss of grades. If at any point you are even slightly unsure, please check as soon as
possible with course staff.
Plagiarism All work on this assignment is to be your own individual work. By submitting the assignment
you are claiming it is entirely your own work. You may discuss the overall general design of the application
with other students. Describing details of how you implement your design with another student is considered
to be collusion and will be counted as plagiarism.
You may not copy fragments of code that you find on the Internet to use in your assignment. Code supplied
by course staff (from this semester) is acceptable, but must be clearly acknowledged as described in the next
paragraph.
You may find ideas of how to solve problems in the assignment through external resources (e.g. StackOverflow, textbooks, ...). If you use these ideas in designing your solution you must cite them. To cite a resource,
provide the full bibliographic reference for the resource in file called refs.md. The refs.md file must be in the
root folder of your project. For example:
1 > cat refs.md
2 [1] E. W. Dijkstra, "Go To Statement Considered Harmful," _Communications of the ACM_,
3 vol 11 no. 3, pp 147-148, Mar. 1968. Accessed: Mar. 6, 2024. [Online]. Available:
4 https://www.cs.utexas.edu/users/EWD/transcriptions/EWD02xx/EWD215.html
5 [2] B. Liskov and J. V. Guttag, Boston: _Program development in Java: abstraction,
6 specification, and object-oriented design_. Boston: Addison-Wesley, 2001.
7 [3] T. Hawtin, "String concatenation: concat() vs '+' operator," stackoverflow.com,
8 Sep. 6, 2008. Accessed: Mar. 8, 2024. Available:
9 https://stackoverflow.com/questions/47605/string-concatenation-concat-vs-operator
10 >
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In the code where you use the idea, cite the reference in a comment. For example:
1 /**
2 * What method1 does.
3 * [1] Used a method to avoid gotos in my logic.
4 * [2] Algorithm based on section 6.4.
5 */
6 public void method1() ...
8 /**
9 * What method2 does.
10 */
11 public void method2() {
12 System.out.println("Some " + "content."); // [3] String concatenation using + operator.
13 }
You must be familiar with the university’s policy on plagiarism.
https://uq.mu/rl553
If you have questions about what is acceptable, please ask course staff.
Generative Artificial Intelligence You are required to implement your solution on your own, without the
use of generative artificial intelligence (AI) tools (e.g. ChatGPT or Copilot). This is a learning exercise and you
will harm your learning if you use AI tools inappropriately. Remember, you will be required to write code, by
hand, in the final exam.
Specification
Specification documents of classes that you must implement are provided in the form of JavaDocs.
◦ Implement the classes and interfaces exactly as described in the JavaDocs.
◦ Read the JavaDocs carefully and understand the specification before programming.
◦ Do not change the public specification of any required class in any way, including changing the names of,
or adding additional public: inner classes, inner interfaces, methods, or fields.
◦ You are encouraged to add additional private members, classes, or interfaces as you see fit.
◦ You are encouraged to add additional non-inner classes or interfaces as you see fit to the sheep.parsing and
sheep.ui.graphical.javafx packages.
◦ JUnit 4 test cases that you submit must only test the public and protected methods as specified in the
JavaDocs. They must not rely on any other members, classes, or interfaces you may have added to the classes
being tested. You may create private members and other classes in your test code.
You can download the working SheeP implementation and the JavaDoc specifications for Assignment 2 from
BlackBoard (Assessment → Assignment Two). You can also access the JavaDoc for Assignment 2 at the link
below.
https://csse7023.uqcloud.net/assessment/assign2/docs/
Getting Started
To get started, download the provided code from BlackBoard. This archive includes a working version of the
solution to Assignment 1 as a Swing application. Create a new IntelliJ project following the JavaFX Guide on
BlackBoard. Extract the archive in a directory and move it into the newly created project.
Project Overview
The design of the application is essentially the same as for Assignment 1, but some classes have been added to
the implementation as described below.
sheep.core Provided, as for Assignment 1.
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sheep.sheets Updated from Assignment 1. You must implement Sheet::encode() and SheetBuilder::load().
sheep.expression Provided, as for Assignment 1.
sheep.expression.basic Provided, as for Assignment 1.
sheep.expression.arithmetic Updated from Assignment 1. Note that the Arithmetic class is now a subclass
of Operation (rather than Expression) and a sibling class of Function. You must implement the Mean
and Median classes.
sheep.parsing Updated from Assignment 1. You must implement the ComplexParser class. A new class
ComplexScanner has been provided to assist you in writing this class.
sheep.fun Provided, as for Assignment 1.
sheep.ui Provided application constraints for the ui.
sheep.ui.graphical Provided application constraints for just GUIs.
sheep.ui.graphical.swing Provided version of Assignment 1’s GUI implemented using Swing.
sheep.ui.graphical.javafx You must implement a new GUI using JavaFX that has the same look and feel as
sheep.ui.graphical.swing.
Stages
As for Assignment 1, this assignment will be implemented in stages to encourage incremental development. You
should finish each stage before moving on to the next one. At each stage, ensure that you thoroughly test your
implementation.
Stage 0 Organisations sometimes decide that they want to move over from one platform (such as hardware or software) to another. In the first stage of this assignment, we will mimic such a scenario and you
need to change the SheeP implementation to use the JavaFX library instead of the Java Swing library.
To provide backward compatibility, the program should continue to work with the Java Swing library, but
any new functionality will only be implemented using the JavaFX library. A command-line argument is
used in the main method to control which particular library is used. If the program is executed with the
single argument “legacy”, then the implementation will use the old GUI. If there are no arguments or any
unrecognised arguments, the implementation will use new JavaFX version. After completing this stage,
and with the appropriate data loaded into the spreadsheet, the SheeP implementation should display as
below, irrespective of which GUI library is used.
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Stage 1 Extend the SheeP implementation to support the two built-in spreadsheet functions MEAN and
MEDIAN. This will require changes to the parser. A new class ComplexScanner has been provided to assist
you with this. To become familiar with the ComplexScanner class, you must implement JUnit test cases
for this class. These will form part of the assessment for this assignment. You must then implement the
following classes:
sheep.parsing.ComplexParser
sheep.expression.arithmetic.Mean
sheep.expression.arithmetic.Median
Your JUnit test cases should test all the public and protected methods specified in the JavaDoc of the
classes ComplexScanner, Mean and Median. You must submit these tests and they must be located in the
following files:
test/sheep/parsing/ComplexScannerTest.java
test/sheep/expression/arithmetic/MeanTest.java
test/sheep/expression/arithmetic/MedianTest.java
After completing this stage, and with the appropriate data loaded into the spreadsheet, the SheeP implementation should display as below.
Stage 2 Extend the implementation to support a File menu with Save As and Open options to save
the content of a spreadsheet to a file and to load a previously saved spreadsheet from a file. First you
must implement Sheet::encode() and SheetBuilder::load(). Then design an appropriate menu bar
for your UI to expose the features provided by sheep.ui.UI::addFeature(), ensuring that you provide an
appropriate implementation of the Prompt interface. Hint: Consider using the javafx.stage.FileChooser
class to help implement the Prompt interface. After completing this, your implementation of the File menu
should behave as shown in the following screenshots. Note that the exact look and feel may vary depending
on the operating system used to implement the functionality (the screenshots below were generated on a
Mac). This is acceptable. The critical aspect is that the Save As and Open menu options should allow the
user to save the current spreadsheet and open a previously saved spreadsheet to/from any file.
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File: The menu bar.
Save As: The save dialog.
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Open: The open dialog.
Grading
Five aspects of your solution will be considered in grading your submission:
1. Automated functionality test: the following classes that you must implement will have JUnit unit tests
associated with them that we will use to test your implementation:
sheep/expression/arithmetic/Mean
sheep/expression/arithmetic/Median
sheep/parsing/ComplexParser
sheep/sheets/Sheet
sheep/sheets/SheetBuilder
The percentage of test cases that pass will be used as part of your grade calculation.
2. JUnit test cases: your JUnit test cases will be assessed by testing both correct and faulty implementations of the ComplexScanner, Mean, and Median classes. The percentage of implementations that are
appropriately identified as correct or faulty will be used as part of your grade calculation.
3. Manual functionality test: to ensure that the look and feel of your GUI implementation is the same as the
original implementation, and to ensure that the Save As and Open menu options are properly invoked by
the GUI, a small scenario with a number of steps in it will be manually executed by course staff. The
faults identified during these steps will be used as part of your grade calculation.
4. Automated style check: as for Assignment 1, style checking on your code will be performed using the
Checkstyle tool1
. The number of style violations identified by the Checkstyle tool will be used as part of
your grade calculation. Note: There is a plug-in available for IntelliJ that will highlight style violations
in your code. Instructions for installing this plug-in are available in the Java Programming Style Guide
on BlackBoard (Learning Resources → Guides). If you correctly use the plug-in and follow the style
requirements, it should be relatively straightforward to do well for this part of the assessment.
5. Manal style check: as for Assignment 1, the style and structure of your code will also be assessed by course
staff. However, in this case, your performance on these criteria will also be used as part of your grade
1The latest version of the course Checkstyle configuration can be found at http://csse7023.uqcloud.net/checkstyle.xml. See
the Style Guide on BlackBoard for instructions on how to use it in IntelliJ.
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calculation. It is therefore critically important that you read and understand the feedback for this part
on Assignment 1, so that you can address any issues in this assignment. See Appendix B for criteria that
will be used to assess the readability of your code.
Appendix B shows how the above are combined to determine your grade for the assignment.
Automated aspects of the assessment
Three aspects of assessment will performed automatically in a Linux environment: execution of JUnit test
cases, running your JUnit test cases on correct and faulty implementations, and automated style check using
Checkstyle. The environment will not be running Windows, and neither IntelliJ nor Eclipse (or any other IDE)
will be involved. OpenJDK 21 with the JUnit 4 library will be used to compile and execute your code and tests.
To prevent infinite loops, or malicious code, from slowing down Gradescope, any test that takes longer than 10
seconds to execute will be killed and identified as failing. All tests should execute in a small fraction of a second.
Any test taking longer than a second to execute indicates faulty logic or malicious code. Similarly, any of your
JUnit test cases that take longer than 20 seconds to execute on one of the correct/faulty implementations, or
that consume more memory than is reasonable, will be stopped.
IDEs like IntelliJ provide code completion hints. When importing Java libraries they may suggest libraries
that are not part of the standard library. These will not be available in the test environment and your code
will not compile. When uploading your assignment to Gradescope, ensure that Gradescope says that your
submission was compiled successfully.
Your code must compile.
If your submission does not compile, you will receive a grade of one.
Submission
Submission is via Gradescope. Submit your code to Gradescope early and often. Gradescope will give you some
feedback on your code, but it is not a substitute for testing your code yourself.
What to Submit Your submission must have the following internal structure:
src/ Folders (packages) and .java files for classes that you modified or created for this assignment.
test/ Folders (packages) and .java files for the JUnit classes that you created for this assignment.
refs.md File containing the references for any citations in your code.
Included in the root directory of the provided code are the files bundle.sh and bundle.bat. For MacOS and
Unix users, double-click the bundle.sh file to execute it. For Windows users, double-click the bundle.bat file
to execute it. This will create a submission.zip file for you to upload to Gradescope.
You can create the submission zip file yourself using a zip utility. If you do this, you must ensure that you do
not miss any files or directories and that you do not add any extra files. We recommend using the provided
bundle scripts.
A complete submission would contain the following files in their specified directories.
src/sheep/expression/arithmetic/Mean.java
src/sheep/expression/arithmetic/Median.java
src/sheep/parsing/ComplexParser.java
src/sheep/parsing/*
src/sheep/ui/graphical/javafx/SheepApplication.java
src/sheep/ui/graphical/javafx/*
test/sheep/expression/arithmetic/MeanTest.java
test/sheep/expression/arithmetic/MedianTest.java
test/sheep/parsing/ComplexScannerTest.java
refs.md
* Any number of files other than the ones specified in the JavaDoc
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Ensure that your classes and interfaces correctly declare the package they are within. For example,
Mean.java should declare package sheep.expression.arithmetic;.
Only submit the src and test folders and the refs.md file in the root directory of your project.
Do not submit any other files (e.g. no .class files, IDE files, or Mac .filename files).
Provided Files A small number of the unit tests used for assessing functionality will be provided in Gradescope. These will be used to test your submission, each time you upload it.
These are meant to provide you with an opportunity to receive feedback on whether the basic functionality of
your classes works correctly or not. Passing all the provided unit tests does not guarantee that you will pass
all the tests used for functionality grading.
Similarly, correct implementations for the ComplexScanner, Mean, and Median classes are used to run the JUnit
tests that you submit, to ensure that tests do not fail on a correct implementation. Note that for assessing your
JUnit tests we will also use faulty implementations of these classes.
The provided code on BlackBoard contains a resources directory. In this directory is a handful of sample
spreadsheets in the correct format to be loaded by the application. Each sheet should load correctly except
for broken.sheep which is used to demonstrate an example of a file which should fail to load. hard.sheep is
an example of a sheet that should load correctly, but if saved will generate a different file. hard-fixed.sheep
demonstrates what hard.sheep would look like if it were saved. You can use these files to check your implementation of loading and saving spreadsheet files. You should test your implementation using other spreadsheets
as well.
Assessment Policy
Late Submission You must submit your code before the deadline. Code that is submitted after the deadline
will receive a late penalty as described in section 5.3 of the course profile. The submission time is determined
by the time recorded on the Gradescope server. A submission is not recorded as being received until uploading
your files completes. Attempting to submit at the last minute may result in a late submission.
You may submit your assignment to Gradescope as many times as you wish before the due date. There will be
two submission links on Gradescope, one for “on-time” submissions and one for “late” submissions. If you have
an extension for the assignment, you will submit your assignment via the “late” submissions link. Your last
submission made to the “on-time” submission link, before the due date, will be the one that is graded, unless
you make a submission to the “late” submission link. If a misconduct case is raised about your submission, a
history of regular submissions to Gradescope, which demonstrate progress on your solution, could support your
argument that the work was your own.
You are strongly encouraged to submit your assignment on time, or by the revised deadline if you have an
extension. Experience has demonstrated that most students who submit their assignments late lose more grades
due to the late penalties than they gain by making improvements to their work.
Extensions If an unavoidable disruption occurs (e.g. illness, family crisis, etc.) you should consider applying
for an extension. Please refer to the following page for further information.
https://uq.mu/rl551
All requests for extensions must be made via my.UQ, before the submission deadline. Do not email the course
coordinator or other course staff to request an extension.
Re-Grading If an administrative error has been made in the grading of your assignment, please contact
the course coordinator (csse7023@uq.edu.au) to request this be fixed. For all other cases, please refer to the
following page for further information.
https://uq.mu/rl552
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Change Log Revision: 1.0
If it becomes necessary to correct or clarify the task sheet or JavaDoc, a new version will be issued and an
announcement will be made on the course BlackBoard site. All changes will be listed in this section of the task
sheet.
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A CRITICAL MISTAKES
A Critical Mistakes
THINGS YOU MUST AVOID
This is being heavily emphasised here because these are critical mistakes which must be avoided.
Code may run fine locally on your own computer in IntelliJ, but it is required that it also builds and runs
correctly when it is executed by the automated grading tool in Gradescope. Your solution needs to conform to
the specification for this to occur.
• Files must be in the correct directories (exactly) as specified by the JavaDoc. If files are in incorrect
directories (even slightly wrong), you may lose grades for functionality in these files because the implementation does not conform to the specification.
• Files must have the correct package declaration at the top of every file. If files have incorrect package
declarations (even slightly wrong, such as incorrect capitalisation), you may lose grades for functionality
in these files because the implementation does not conform to the specification.
• You must implement the public and protected members exactly as described in the supplied documentation (no extra public/protected members or classes). Creating public or protected data members in a
class when it is not specified will result in loss of grades, because the implementation does not conform
to the specification.
◦ You are encouraged to create private members as you see fit to implement the required functionality
or improve the design of your solution.
• Do not import the org.junit.jupiter.api package. This is from JUnit 5 and may cause our JUnit
tests to fail.
• Do not use any version of Java other than 21 when writing your solution. If you accidentally use Java
features which are different in a version older than 21, then your submission may fail functionality tests. If
you accidentally use Java features which are only present in a version newer than 21, then your submission
may fail to compile.
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B GRADING
B Grading
The following table shows how your grade for this assignment is calculated from the various components. Each
of the components are explained in further detail below.
Grade 7 6 5 4 3 2 1
Functionality ≥ 85% ≥ 75% ≥ 65% ≥ 50% ≥ 45% ≥ 20% any
Checkstyle
Violations ≤ 1 ≤ 3 ≤ 5 ≤ 10 ≤ 15 ≤ 20 any
Code Style and
Structure 7 ≥ 6 ≥ 5 ≥ 4 ≥ 3 ≥ 2 any
The grade you receive is the highest grade for which all three conditions in the corresponding column are
satisfied. For example, if your functionality score is 77%, you have 7 style violations, and your code style and
structure grade is 3, your assignment grade will be a 4.
Functionality
Functionality will be calculated as a weighted percentage based on three components:
• Automated testing will be performed by JUnit and count for 60%.
• JUnit test marking will be performed by running your JUnit test cases against correct and faulty implementations and count for 20%.
• Manual testing will be performed by course staff and count for 20%.
Automated Testing
As for Assignment 1, this component of the assessment will be the percentage of JUnit tests you pass.
JUnit Test Marking
The JUnit tests you write for a class (e.g. ClassnameTest.java) are evaluated by checking whether they can
distinguish between a:
correct implementation of the respective class
e.g. Classname.java, made by the teaching staff, and
incorrect implementations of the respective class
“deliberately made (sabotaged) by the teaching staff”.
This component of the assessment will be the percentage of implementations that your JUnit tests identifies
appropriately. To identify a correct implementation appropriately, all JUnit tests must pass for that implementation. In other words, if one or more of your JUnit tests fail on a correct implementation, it has not been
identified appropriately. To identify an incorrect implementation appropriately, at least one of the JUnit tests
must fail on that implementation. In other words, if all your JUnit tests pass on an incorrect implementation,
it has not been identified appropriately.
There are some limitations on your tests:
1. if your tests take more than 20 seconds to run, or
2. if your tests consume more memory than is reasonable,
then your tests will be stopped and the implementation will deemed not to have been identified appropriately.
These limits are very generous (e.g. your tests should take a fraction of a second to run).
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B GRADING
Manual Testing
To ensure that the look and feel of your GUI implementation is the same as the original implementation, and to
ensure that the functionality of the Save and Open options are properly invoked by the GUI, a small scenario
with a number of steps in it will be manually executed by course staff.
Marks will be allocated for each aspect implemented correctly as shown below. These marks will then be
converted to a percentage that will be used in the grade calculation.
• Legacy UI still works for legacy behaviour (5 mark)
• JavaFX Appearance (10 marks)
– Appropriate Title bar (2 marks)
– Appropriate Formula bar (2 marks)
– Displays a grid (2 mark)
– Column and Row headers present and correct (2 mark)
– Grid preferred height and width approximately respected (2 mark)
• Additional Features (10 marks)
– File->Save and File->Open menu items present (2 marks)
– File->Save works correctly for constants (2 marks)
– File->Save works correctly with references and built-in functions (2 marks)
– File->Open works correctly for constants (2 marks)
– File->Open works correctly with references and built-in functions (2 marks)
Automated Style Checking
As for Assignment 1, the Checkstyle tool is used for automated style checking and the number of style violations
identified for your code is used in the grade calculation as indicated in the table above. For the Checkstyle tool,
multiple style violations of the same type will each count as one additional violation.
Code Style and Structure
As for Assignment 1, the style and structure of your code will be assessed by course staff, but for this assignment
it will be incorporated into the grade calculation as indicated in the table above. Style and structure will be
graded according to the rubric provided below (which is the same as for Assignment 1). This is then converted
to a grade for this aspect of the assessment according to the following table.
Grade Performance Against Criteria
7 At most one criteria rated as Proficient and all others as Advanced.
6 At most three criteria rated as Proficient, and all others as Advanced.
5 At most one criteria rated as Developing, and all others as Advanced or Proficient.
4 At most three criteria rated as Developing, and all others as Advanced or Proficient.
3 At least four criteria rated as Developing and none as Advanced, or five or more rated as Developing.
2 At least five criteria rated as Developing and none as Advanced, or six or more rated as Developing.
1 All criteria rated as Developing.
The key consideration in grading your code style is whether the code is easy to understand. Code style will be
assessed against the following criteria.
Readability
• Program Structure: Layout of code makes it easier to read and follow its logic. This includes using
whitespace to highlight blocks of logic.
• Descriptive Identifier Names: Variable, constant, function, class and method names clearly describe what
they represent in the program’s logic. Do not use what is called the Hungarian Notation for identifiers.
In short, this means do not include the identifier’s type in its name (e.g. item_list), rather make the
name meaningful. (e.g. Use items, where plural informs the reader it is a collection of items and it can
easily be changed to be some other collection and not a list.)
• Named Constants: All non-trivial fixed values (literal constants) in the code are represented by descriptive
named (symbolic) constants.
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B GRADING
Documentation
• Comment Clarity: Comments provide meaningful descriptions of the code. They should not repeat what
is already obvious by reading the code (e.g. # Setting variable to 0.). Comments should not be
verbose or excessive, as this can make it difficult to follow the code.
• Informative JavaDoc: Every class, method and member variable4 should have a JavaDoc comment that
explains its purpose. This includes describing parameters, return values, and potentially thrown exceptions
so that others can understand how to use the method correctly.
• Description of Logic: All significant blocks of code should have a comment to explain how the logic works.
For a small method, the logic should usually be clear from the code and JavaDoc. For long or complex
methods, each logical block should have an in-line comment describing its logic.
Design & Logic
• Single Instance of Logic: Blocks of code should not be duplicated in your program. Any code that needs
to be used multiple times should be implemented as a method.
• Variable Scope: Variables should be declared locally in the method in which they are needed. Class
variables are avoided, except where they simplify program logic.
• Control Structures: Logic is structured simply and clearly through good use of control structures (e.g.
well-designed loops and conditional statements).
• Encapsulation: Classes are designed as self-contained entities with state and behaviour. Methods only
directly access the state of the object on which they were invoked. Methods never update the state of
another object.
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Rubric
Criteria Standard
Readability Advanced Proficient Developing
Program
Structure
Whitespace & comments highlight all blocks
of logic, making it easy to follow.
Whitespace & comments highlight some blocks
of logic, decreasing readability at times.
Whitespace & comments are not used well,
decreasing readability in several places.
Identifier Names All identifier names are informative and well chosen, increasing readability of the code. Most identifier names are informative, aiding code readability to some extent. Several identifier names are not informative, detracting from code readability.
Symbolic
Constants
All, non-trivial, constant values are informative and well named, symbolic constants. Most, non-trivial, constant values are inform- ative, symbolic constants. Only some, non-trivial, constant values are informative, symbolic constants.
Documentation
Comment
Clarity

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