Assignment Requirements

This page lists the example project requirements for Example 4 in CC 410. Read the requirements carefully and discuss any questions with the instructors or TAs.


This example will cover adapting an existing project to use inheritance and interfaces

General Requirements


This project is the first that requires ALL general requirements introduced in the “Hello Real World” project. Read this section carefully to see what is required for this particular milestone.

  • All code must be object-oriented.
    • All executable code must be within a class
      • Python package files such as and are exempt.
    • Classes must be organized into packages based on common usage.
  • All projects must include automation for testing, style checking, and documentation generation.
    • Java: Use Gradle with the application, jacoco, and checkstyle plugins.
    • Python: Use tox configured to use Python 3.10 and a requirements file to install libraries.
  • All code must properly compile and be executable.
    • Java: It must compile and execute using Gradle.
    • Python: It must execute using Python 3.10. Where specified, type hints should be included in the code, and all code should pass a strict Mypy type check.
  • All code submitted must be free of style errors. We will be using the Google Style Guide for each language.
    • Java: Use Checkstyle 10.6.0+ and the Google Style Configuration.
      • You may modify the configuration to allow 4 space indentations instead of 2 space indentations.
    • Python: Use Flake8 with the flake8-docstrings and pep8-naming plugins. Code should conform to PEP 8 style with Google style docstrings.
  • Where specified, code should contain appropriate unit tests that achieve the specified level of code coverage.
    • Java: Use JUnit 5. You may choose to use Hamcrest for assertions.
    • Python: Use pytest. You may choose to use Hamcrest for assertions.
  • Where specified, code should contain appropriate documentation comments following the language’s style guide.
    • In any class that should be documented, every method in that class should have complete documentation comments.
    • Java: Use javadoc to generate documentation.
    • Python: Use pdoc3 to generate documentation.
  • Submissions to Canvas should be tagged GitHub releases that are numbered according to Semantic Versioning.

Assignment Requirements

This milestone should include the following features:

  • Update all fruit classes to directly inherit from the Fruit abstract class.
    • The Fruit class should include an abstract getter for the name attribute that returns the name of the fruit.
  • Add an IBlendable interface that defines a blend() method, and all classes that include the blend() method should implement that interface.
  • Add a new Apple class that properly inherits the Fruit superclass and the IBlendable interface.
  • Update the main() method in the Main class to do the following:
    • Create a list containing an instance of each class implementing the IBlendable interface. The list should have the IBlendable data type.
    • Iterate through the list and call the blend method on each object.
    • If the object is a subclass of Fruit, print the name of the fruit before calling blend.

Time Requirements

Completing this project is estimated to require 1 hour.

Grading Rubric

This assignment will be graded based on the rubric below:

  • Fruit abstract class - 30%
  • Fruit classes properly inherit Fruit - 10%
  • IBlendable interface - 30%
  • Blendable classes properly implement IBlendable - 10%
  • Main method code - 20%

The following deductions apply:

  • Any portion of the project which will not compile (Java), pass a strict type check (Python), or execute properly will be given a grade of 0.

This is not an exhaustive list of possible deductions. The instructors will strive to provide reasonable and fair grading, but we can’t predict all possible defects. It is up to the student to ensure that the project is complete and correct before submission.


Submit this assignment by creating a release on GitHub and uploading the release URL to the assignment on Canvas. You should not submit this Codio project or mark it as complete in Codio, in case you need to come back to it and make changes later.