Question: Take this JAVA code and add all appropriate Javadoc comments to all methods. /////////////////////////////////////////////// import java.util.ArrayList; import java.util.List; class Student implements Comparable { String id;
Take this JAVA code and add all appropriate Javadoc comments to all methods.
///////////////////////////////////////////////
import java.util.ArrayList;
import java.util.List;
class Student implements Comparable
String id;
String firstName;
String lastName;
List
Student(String id, String fName, String lName) {
this.id = id;
this.firstName = fName;
this.lastName = lName;
}
@Override
public String toString() {
return "Student: " + id + " " + firstName + " " + lastName;
}
public int compareTo(Student st) {
int val = this.id.compareTo(st.id);
return val < 0 ? -1 : val > 0 ? 1 : (this.firstName + this.lastName).compareTo(st.firstName + st.lastName);
}
public String getId() {
return id;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public void addCourse(Course course) {
courses.add(course);
}
public Course getCourse(String courseid) {
Course course = null;
for (int i = 0; i < courses.size(); i++) {
if (courses.get(i).getId().equals(courseid)) {
course = courses.get(i);
break;
}
}
return course;
}
public void dropCourse(String courseId) {
Course course = getCourse(courseId);
if (course != null) {
courses.remove(course);
System.out.println("Course dropped for student: " + id + " " + course);
}
}
public void dropCourseBelow(String courseId, int grade) {
Course course = getCourse(courseId);
if (course != null) {
if (course.grade < grade) {
courses.remove(course);
System.out.println(" Course dropped for student (low grade): " + id + " " + course);
}
}
}
public void displayCourses() {
System.out.println("Courses for student " + id + ": ");
for (int i = 0; i < courses.size(); i++) {
System.out.println(" " + courses.get(i));
}
}
public void displayIfHaveCourse(String courseId) {
Course course = getCourse(courseId);
if (course != null) {
System.out.println(" " + toString());
}
}
}
class Course {
String id; // course id
int grade;
Course(String id, int grade) {
this.id = id;
this.grade = grade;
}
@Override
public String toString() {
return "Course: " + id + " grade = " + grade;
}
public String getId() {
return id;
}
public int getGrade() {
return grade;
}
}
class Roster {
Student root;
int numStudents;
List
public Roster() {
root = null;
numStudents = 0;
}
public void addStudent(Student st) {
students.add(st);
}
public void displayAllStudents() {
System.out.println("Displaying all students:");
for (int i = 0; i < students.size(); i++) {
System.out.println(students.get(i));
}
}
public Student find(String id) {
Student student = null;
for (int i = 0; i < students.size(); i++) {
if (students.get(i).getId().equals(id)) {
student = students.get(i);
break;
}
}
return student;
}
public void addCourse(String id, Course course) {
Student student = find(id);
if (student != null) {
System.out.println("Course added for student: " + id + " " + course);
student.addCourse(course);
}
}
public void displayStudents(String courseId) {
System.out.println("Displaying students with course: " + courseId);
for (int i = 0; i < students.size(); i++) {
students.get(i).displayIfHaveCourse(courseId);
}
}
public void displayCourses(String id) {
Student student = find(id);
if (student != null) {
student.displayCourses();
}
}
public void displayCourseAverage(String courseId) {
int total = 0, count = 0;
for (int i = 0; i < students.size(); i++) {
Course course = students.get(i).getCourse(courseId);
if (course != null) {
total += course.grade;
count++;
}
}
if (count == 0) {
System.out.println("Average of course: " + courseId + " no student enrolled in this.");
} else {
System.out.println("Average of course: " + courseId + " " + (total / count));
}
}
public void dropCoursesBelow(String courseId, int grade) {
System.out.println("Dropping course: " + courseId + " with grade below " + grade);
for (int i = 0; i < students.size(); i++) {
students.get(i).dropCourseBelow(courseId, grade);
}
}
public void dropCourse(String id, String courseId) {
Student student = find(id);
if (student != null) {
student.dropCourse(courseId);
}
}
public void changeGrade(String id, String courseid, int grade) {
Student student = find(id);
if (student != null) {
Course course = student.getCourse(courseid);
if (course != null) {
course.grade = grade;
System.out.println("Grade changed for student: " + id + " " + course);
}
}
}
public void deleteStudent(String id) {
Student student = find(id);
String msg = "Deleting student: " + id + " => ";
if (student == null) {
System.out.println(msg + "Student doesn't exist");
} else {
students.remove(student);
System.out.println(msg + "Deleted");
}
}
}
public class Homework5 {
static Roster roster = new Roster();
public static void main(String[] args) {
addStudent();
displayAllStudents();
lookupStudent("11114");
deleteStudent("11113");
addCourses();
changeGrade("11112", "Math161", 80);
dropCourse("11111", "Math161");
dropCoursesBelow("Math161", 65);
displayCourses("11112");
displayAllStudents();
displayStudents("Math161");
displayCourseAverage("CS146");
}
// add students to the roster static void addStudent() {
roster.addStudent(new Student("11111", "Jon", "Benson"));
roster.addStudent(new Student("11112", "Erick", "Hooper"));
roster.addStudent(new Student("11113", "Sam", "Shultz"));
roster.addStudent(new Student("11114", "Trent", "Black"));
roster.addStudent(new Student("11115", "Michell", "Waters"));
roster.addStudent(new Student("11116", "Kevin", "Johnson"));
}
// diaplay all students in the roster static void displayAllStudents() {
roster.displayAllStudents();
}
// lookup a student in the roster static void lookupStudent(String id) {
Student student = roster.find(id);
if (student != null) {
System.out.println(id + " found " + student);
} else {
System.out.println(id + " not found");
}
}
// delete a in the roster static void deleteStudent(String id) {
roster.deleteStudent(id);
}
// add courses to the roster static void addCourses() {
roster.addCourse("11111", new Course("CS116", 80));
roster.addCourse("11111", new Course("Math161", 90));
roster.addCourse("11112", new Course("Math161", 70));
roster.addCourse("11112", new Course("CS146", 90));
roster.addCourse("11112", new Course("CS105", 85));
roster.addCourse("11113", new Course("CS216", 90));
roster.addCourse("11114", new Course("CIS255", 75));
roster.addCourse("11114", new Course("CS216", 80));
roster.addCourse("11114", new Course("Math161", 60));
roster.addCourse("11114", new Course("COMM105", 90));
}
// display students enrolled in a given course id static void displayStudents(String courseId) {
roster.displayStudents(courseId);
}
// display courses taken by a student static void displayCourses(String id) {
roster.displayCourses(id);
}
// display the average grade for a student static void displayCourseAverage(String courseId) {
roster.displayCourseAverage(courseId);
}
// display the average grade for a student static void dropCoursesBelow(String id, int grade) {
roster.dropCoursesBelow(id, grade);
}
// drop a course from a student static void dropCourse(String id, String courseId) {
roster.dropCourse(id, courseId);
}
// change the grade for a student static void changeGrade(String id, String courseId, int grade) {
roster.changeGrade(id, courseId, grade);
}
}
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