辅导 data编程、讲解 java程序语言
CourseManager
Description
In this assignment, you are tasked with implementing a class named CourseManager . This
system works in conjunction with predefined Student and Course classes to implement a
Credit-based Course Selection System. This system needs to include functionalities for
students to select courses based on credit points or cancel the selection, as well as generate
results for credit-based course selections.
In the credit-based course selection system, there exist two states:
when ifOpen is set to true , it means that the credit-based course selection phase is currently
underway;
else, when ifOpen is false , it denotes that the course selection period has ended, In this state,
the system determines the final list of successful enrollments based on the course capacity and
the credit bids placed.
For Student:
Within the course selection system, each student has an initial credit value credits , a list of
enrolled courses enrollCourses , and a list of successfully selected courses successCourses .
During the credit-based course selection phase, a student can:
1. Bid credits to enroll courses. A student can not enroll one course twice.
2. Modify the credit values allocated to a enrolled course.
3. Cancel course enrollment, with the bid credits being refunded.
4. Update enrollCourse (upon course selection or cancel).
5. Query their list of courses they have bid credits for and the corresponding credits.
After the credit-based course selection phase ends, a student can:
1. Update successCourse (upon course withdraw).
2. View their list of successfully enrolled courses.
3. Withdraw course selection, but note that credit refunds are not provided.
For Course:
Each course has a set capacity, along with a list of students who have bid credits enrollStudent
and their corresponding credit lists credits , as well as a list of students who have successfully
enrolled in the course successStudents .
During the credit-based course selection phase, a course can:
1. Obtain the list of credit points bid by students credits .
2. Get a list of students who have bid credits enrollStudents .
3. Update enrollStudent and credits (when course enrollments, withdrawals, or
changes to credit bids occur).
After the credit-based course selection phase ends, a course can:
1. Update successStudents .
2. Query the list of students who have successfully enrolled.
For the CourseManager:
The course selection system maintains a status ifOpen and holds a list of all students students
and a list of all courses courses .
During the credit-based course selection phase, the course selection system can:
1. Update student and course information based on course selection applications.
2. Update student and course information based on course withdrawal applications.
3. Return to a student their list of courses for which they have bid credits and the
corresponding credits upon querying their course status.
At the end of the credit-based course selection phase, the course selection system can:
1. Generate the enrollment results for each course based on the students' credit bids and
the course capacities, subsequently updating relevant student and course information
accordingly.
Problems
Student and Course classes are in CourseManagerTest.java
CourseManagerTest.java can be download from blackboard or by:
link：https://pan.baidu.com/s/1BRGjdYnvNtxGrZzXYTWyQQ?pwd=1111
1. Review and understand the provided Student class. [No Points]
2. Review and understand the provided Course class. [No Points]
3. Implement and submit the CourseManager class. [100 Points]
submission guideline can be download from blackboard or by:
link：https://pan.baidu.com/s/1pBRUC0_SCvkp2_mttFhV9w?pwd=1111
Notes for this assignment
1. Do not use package statements in your source code.
2. The output of methods should follow the specification exactly. Do not print extraneous
information within any methods.
3. The CourseManager class must interface correctly with the provided Student and Course
classes without modifying them.
We will explain the classes mentioned in this assignment, in which the Student and Course
classes will explain the fields involved, please refer to the specific methods in codes provided
on your own, and the CourseManager class will explain the fields as well as the use of the
methods that need to be implemented and the points of note
Class1: Student (already implemented, not to be submitted)
Review the provided Student.java file. The Student class represents a student with specific
attributes and behaviors. Use this information to determine how the CourseManager should
interact with students.
Fields:
Class2: Course (already implemented, not to be submitted)
Review the provided Course.java file. The Course class represents a course with attributes
such as capacity, students enrolled, and enrollment credits. Utilize this information when
implementing the CourseManager .
Fields:
// Basic information about one student and the studentID is unique.
// Same student ID or same student objects can both be considered as
representing the same student.
private String studentID;
private String email;
private String name;
// The manager class instance, in which all the methods related to the
interaction between the student and the course are implemented.
// Each student only enrolls in one cousermanager.
private CourseManager courseManager;
// Credit points available for students, will be assigned in the constructor or
set method.
private int credits;
// Record of courses for which credits have been bid.
private ArrayList enrollCourses;
// Successfully selected courses after the end of the credit-based course
selection phase.
private ArrayList successCourses;
// Basic information about one course and the curseID is unique.
// Same course ID or same course objects can both be considered as representing
the same course.
private String courseID;
private String courseName;
// Maxmium capacity for this course
private int maxCapacity;
// The manager class instance, in which all the methods related to the
interaction between the student and the course are implemented.
// Each course only enrolls in one cousermanager.
private CourseManager courseManager;
// Students who bid credits for the course and the corresponding credits bid
private ArrayList enrollStudent;
private ArrayList credits;
Class3: CourseManager (need implemented)
Implement a class named CourseManager in CourseManager.java . This class is responsible for
managing all course-related and student-related functionality in the system. In the class
CourseManager you need to define:
Fields:
Constructor:
Methods:
// Successfully selected students for this course after the end of the creditbased course selection phase.
private ArrayList successStudents;
private ArrayList courses
// Maintains a record of all courses successfully registered.
// It is guaranteed that students enrolled in a course must exist in students.
private ArrayList students
// Maintains a record of all students successfully registered.
// It is guaranteed that courses student enrolled in must exist in courses.
private boolean ifOpen
// Represent system open(true) or not(false).
public CourseManager()
// Constructor, initializes the course and student lists, and set the system
default status open(true).
public ArrayList getStudents()
// getter for students
public ArrayList getCourses()
// getter for courses
public void setIfOpen(Boolean ifOpen)
// setter for ifOpen
public boolean getIfOpen()
// getter for ifOpen
public void addCourse(Course course)
// Register a course. Add a course object to courses and set the courseManager
of the course object to this manager. It is guaranteed that all courseIDs are
unique.
public void addStudent(Student student)
// Register a course. Add a student object to students and set the courseManager
of the student object to this manager. It is guaranteed that all studentIDs are
unique.
/**
* Attempts to enroll a Student in a Course.
* Enrollment will only be successful if the course exists, the student has not
already enrolled, the credits is greater than 0, and they have enough credits to
bid.
* If successful, the student's credits will be reduced by the amount bid on the
course. The corresponding list in Student and Course should be updated.
* Only available when ifOpen is true. Return false if ifOpen is false.
* @return boolean Returns true if student enroll this course successfully;
otherwise, it returns false.
*/
public boolean enrollStudentInCourse(Student student, String courseId, int
credits)
/**
* Modifies the number of credits a student has bid on an already enrolled
course.
* The modification will only be successful if the course exists, the student is
currently enrolled in the course,and the new bid is within the student's
available credits. This can be used to increase or decrease the bid.
* On a successful bid modification, the student's credits will be updated to
reflect the new bid amount. The corresponding list in Student and Course should
be updated.
* Only available when ifOpen is true. Return false if ifOpen is false.
* @return boolean Returns true if the bid modification was successful;
otherwise, it returns false.
*/
public boolean modifyStudentEnrollmentCredits(Student student, String courseId,
int credits)
/**
* Drops a student's enrollment from a specific course.
* The drop will succeed only if the course exists, and the student is currently
enrolled in it.
* If ifOpen is true, upon a successful drop, any credits the student had bid
for this course will be refunded in full. The corresponding list in Student and
Course should be updated.
* Only available when ifOpen is true. Return false if ifOpen is false.
* @return boolean Returns true if the student successfully drops the course;
otherwise, it returns false.
*/
public boolean dropStudentEnrollmentCourse(Student student, String courseId)
It should be noted that, as in the case of our normal selection, if the number of electors exceeds
the maximum number of courses, the principle of "same credit, same drop" will be followed.
Eg. If the maximum number of students is 10, and 15 students choose this course, and after
sorted by enrolled points, if the 8th, 9th, 10th, and 11th students are all of the same credit, then
the four of them will not be able to choose the course successfully, and the number of successful
students will be seven.
(Add any necessary additional methods or helper functions you deem necessary)
Submission Instructions:
Submit CourseManager.java only.
Student and Course classes are in CourseManagerTest.java
Ensure your code can pass CourseManagerTest.java .
How to test your code:
1. Put CourseManagerTest.java to the same directory as CourseManager.java
2. Open CourseManager.java
3. Click red junit①, then click red bulb②. Choose Add 'JUnit5.8.1' to classpath③.
/**
* Completes the course registration process. Change ifOpen to false.
* This method resolves which students get into each course based on their bids
and the course capacities. Students with higher bids are prioritized. The
corresponding list in Student and Course should be updated.
* Only successStudents in class Course and successCourses in class Student need
to be updated.
*/
public void finalizeEnrollments()
/**
* Retrieves a list of courses with associated credits for a given student.
* Each String in the list includes the course ID and the points bid by the
student in enrollCourses, follow the format: "courseID: enrollmentCredits"
(without quotes).
* Only available when ifOpen is true. Return null if ifOpen is false.
* @return A list of Strings, each representing the courses and the respective
credits the student enrolled.
*/
public ArrayList getEnrolledCoursesWithCredits(Student student)
4. Click OK.
5. Click green arrow before "class CourseManagerTest{". And choose Run.
6. You got the running result. Click each test case to see the detail.
How to test your code:
1. Click New File.
2. Choose the new file① and click Rename②.
3. Input the filename①(must end with .java), and click Confirm Rename②.
4. Click Code Submission to submit your code.