Exercises To Modify The Student Record Manager Class

Exercisesmodify The Studentrecordmanager Class Provided For Unit 1 Pro

Modify the StudentRecordManager class provided for Unit 1 project to take advantage of composition design. Use the provided StudentRecordManager.java file, without alterations to parts marked as #ADD. Do not modify other provided files such as the Student class and the data folder. The modified StudentRecordManager class should contain a private instance data member recList, which should be initialized in the constructor by calling loadFromFile(). The displayRecords() method should be public, non-static, and take no parameters, accessing recList directly. The size() method should return the number of records, based on recList, avoiding direct access to the underlying ArrayList. Do not change loadFromFile(). Place the main() method directly within the StudentRecordManager class, which creates an instance with the specified data file, displays records, and outputs the total number of students. Ensure that the program compiles and functions as before, and include a screenshot of the program output in the assignment report.

Paper For Above instruction

In this paper, I will discuss the modifications made to the StudentRecordManager class to incorporate composition design principles, ensuring better encapsulation and adherence to object-oriented programming best practices. The focus is on restructuring the class so that it manages its data through composition, primarily by containing an instance of a collection object that holds student records, and simplifying the class's interface for ease of use and maintainability.

Initially, the StudentRecordManager class managed student data through a collection, most likely an ArrayList, directly accessible to external classes or methods. For enhanced encapsulation, the class needs to contain the collection as a private member, preventing external modification and providing controlled access through class methods. The key change involves replacing any static or external data handling with a private instance data member, recList, which holds student records as an ArrayList<Student>. This collection is initialized in the constructor by invoking the existing loadFromFile() method, which reads data from a file and returns an ArrayList<Student>.

The displayRecords() method's visibility is changed from private or static to public, and its implementation is adjusted to operate on the instance-specific recList. This method will print out student data in a formatted table, iterating through recList. Since recList is now encapsulated within the class, external callers do not need to pass any data to displayRecords(), simplifying its interface.

The size() method now simply returns recList.size(), providing an accurate count of stored Student objects. This approach encapsulates the list's internal structure, shielding other classes from direct access to the collection. It enhances data hiding and promotes modularity.

The loadFromFile() method remains unaltered, maintaining its role as a loader that returns an ArrayList<Student>. The main() method, which was previously outside or separately defined, will now be integrated into the StudentRecordManager class. Its responsibility is to instantiate the class with the specified data file, invoke displayRecords(), and print the total number of students.

Ensuring that all components work seamlessly requires careful integration. The program should compile successfully and produce output consistent with previous versions, displaying student data in tabular form followed by the total count. For assessment, a screenshot of the program's output is included in the assignment report, demonstrating that the modifications preserve functionality while improving design.

In conclusion, by refactoring the StudentRecordManager class to use composition with a private recList member, the code adheres to encapsulation principles. The class becomes more modular, maintainable, and aligned with object-oriented design patterns. The adjustments to methods and the inclusion of main() within the class facilitate straightforward operation and testing of the program, fulfilling the project's requirements effectively.

References

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"Exercisesmodify The Studentrecordmanager Class Provided For Unit 1 Pro"