Yusup R.

[Yusuprozimemet]

No description provided.

[mvcatsifma]

Strong overall submission with correct architecture, good use of inheritance/polymorphism, a properly structured exception hierarchy, and clean CLI/error handling.

Main improvement areas:

• getCourses() currently returns the full backing array including trailing null values, which can lead to NullPointerExceptions when iterating enrolled courses.
• The project runs correctly in IntelliJ, but the current package/directory structure causes issues when compiling/running directly from the command line.
• Several fields in Course are exposed as protected instead of private, reducing encapsulation.
• Commit messages describe progress/state rather than implemented changes.
• Public methods are missing Javadoc comments.

For future assignments:

• Be careful about exposing internal arrays directly — prefer defensive copies.
• Test both IDE-based and command-line compilation/runtime flows when working with Java packages.
• Keep encapsulation strict by default (private first).
• Use short, descriptive commit messages focused on implemented changes.
• Start building the habit of documenting public APIs with Javadoc.

Very solid implementation overall with strong OOP fundamentals and good exception handling.