How to complete these methods:
/**
* Returns a reference to the course with title equals
to the argument. This
* method searches in the courses stored in the HashMap
{@code courses} to find
* the course whose title equals to the argument {@code
title}. If the course is
* not found, {@code null} is returned.
*
* @param title the title of the course
* @return a reference to the course, or {@code null}
if the course is not
* found.
*/
public static Course getCourseByTitle(String title)
{
}
/**
* Returns a reference to the Student whose name equals
to the argument. This
* method searches in the students stored in the
HashMap {@code students} to
* find the student whose name equals to the argument
{@code name}. If the
* student is not found, {@code null} is
returned.
*
* @param name the student name
* @return the student whose name is specified in the
argument, or {@code null}
* if the student is not found
*/
public static Student getStudentByName(String name)
{
}
/**
* Add a new student entry to {@code students}
HashMap.
*
* @param id id of the new student
* @param student object of the new student
* @throws Exception if the new {@code id} exists in
the {@code students}
* HashMap
*/
public static void addStudent(String id, Student
student) throws Exception {
}
/**
* Remove an existing student entry from {@code
students} HashMap.
*
* @param id the 'id' of the student to be
removed
* @throws Exception if the {@code id} does not exist
in the {@code students}
* HashMap
*/
public static void removeStudent(String id) throws
Exception {
}
/**
* Returns the entry in the {@link offerings} list that
has the information
* provided in the arguments. If the entry is not
found, {@code null} is
* returned.
*
* @param courseCode the code of the course
offered
* @param section section of the course
* @param term term
* @param year year
* @return Returns the entry in the {@link offerings}
list that has the
* information provided in the arguments
*/
public static CourseOffering getCourseOffering(String
courseCode, char section, char term, int year) {
}
public static void main(String[] args) {
// Reading the list of course from
the file COURSES_FILE
readCourses();
if (courses.isEmpty())
System.err.println("courses shall not be empty");
// Reading the list of course
from the file STUDENTS_FILE
readStudents();
if (students.isEmpty())
System.err.println("students shall not be empty");
// add few offerings
addOfferings();
if (offerings.isEmpty())
System.err.println("offerings shall not be empty");
CourseOffering courseOffer1 =
getCourseOffering("EECS2030", 'A', 'W', 2020);
if (courseOffer1 != null) {
// enroll the
student whose name is "Maximilian" in the first offering
Student s =
getStudentByName("Maximilian");
if (s != null)
{
try {
enroll(s,
courseOffer1);
System.out.println(s + " is
enrolled in " + courseOffer1);
} catch (Exception e) {
System.err.println("Was
unable to enroll " + s + " in " + courseOffer1 + "\n" +
e.getMessage());
}
} else {
System.err.println("Student Maximilian is not
found");
}
s =
getStudentByName("Alphonso");
if (s != null)
{
try {
enroll(s,
courseOffer1);
System.out.println(s + " is
enrolled in " + courseOffer1);
} catch (Exception e) {
System.err.println("Was
unable to enroll " + s + " in " + courseOffer1 + "\n" +
e.getMessage());
}
} else {
System.err.println("Student Maximilian is not
found");
}
} else {
System.err.println("Course EECS2030 is not offered in
W2020");
}
}
/**
* Populate the course offerings list with few
entries.
*/
public static void addOfferings() {
offerings.add(new
CourseOffering(courses.get("EECS1021"), 20, 'F', 'A', 2020,
LocalDate.of(2020, 9, 30)));
offerings.add(new
CourseOffering(getCourseByTitle("Object Oriented Programming"), 20,
'F', 'B', 2020,
LocalDate.of(2020, 9, 30)));
offerings.add(new
CourseOffering(courses.get("EECS1022"), 30, 'F', 'A', 2020,
LocalDate.of(2020, 9, 30)));
offerings.add(new
CourseOffering(courses.get("EECS2030"), 15, 'W', 'A', 2020,
LocalDate.of(2020, 9, 30)));
}
/**
* Read a list of courses from the file {@link
COURSES_FILE} and populate
* {@code course} HashMap.
*/
public static void readCourses() {
Scanner inputStream = null;
try {
inputStream =
new Scanner(new FileInputStream(PATH + "/eecs2030/lab4/" +
COURSES_FILE));
} catch (FileNotFoundException e)
{
System.out.println("File Courses.csv was not found");
System.out.println("or could not be opened.");
System.out.println(e.toString());
System.exit(0);
}
String line;
while (inputStream.hasNext())
{
line =
inputStream.nextLine();
String[] info =
line.split(",");
Course c = new
Course(info[0].trim(), info[1].trim());
if (info.length
> 2) {
String[] preList = info[2].split(";");
for (String p : preList)
c.addPrerequisite(p.trim());
}
courses.put(c.getCode(), c);
}
inputStream.close();
}
/**
* Read a list of students from the file {@link
STUDENTS_FILE} and populate
* {@code students} HashMap.
*/
public static void readStudents() {
Scanner inputStream = null;
try {
inputStream =
new Scanner(new FileInputStream(PATH + "/eecs2030/lab4/" +
STUDENTS_FILE));
} catch (FileNotFoundException e)
{
System.out.println("File " + STUDENTS_FILE + " was not
found");
System.out.println("or could not be opened.");
System.out.println(e.toString());
System.exit(0);
}
String line;
while (inputStream.hasNext())
{
line =
inputStream.nextLine();
String[] s =
line.split(",");
String id =
s[0].trim();
String name =
s[1].trim();
int y =
Integer.parseInt(s[2].trim());
int m =
Integer.parseInt(s[3].trim());
int d =
Integer.parseInt(s[4].trim());
String email =
s[5].trim();
LocalDate
joinDate = LocalDate.of(y, m, d);
Student stu =
new Student(id, name, joinDate, email);
if (s.length
> 6) {
String[] cc = s[6].split(";");
for (String w : cc) {
stu.completeCourse(w.trim());
}
}
students.put(stu.getId(), stu);
}
inputStream.close();
as your code doesnot have any class i am assuming this is only for understanding purpose, this code will not run.
/**
* Returns a reference to the course with title equals
to the argument. This
* method searches in the courses stored in the HashMap
{@code courses} to find
* the course whose title equals to the argument {@code
title}. If the course is
* not found, {@code null} is returned.
*
* @param title the title of the course
* @return a reference to the course, or {@code null}
if the course is not
* found.
*/
public static Course getCourseByTitle(String title)
{
if(!Courses.containsValue(title))
return null;
for
(Map.Entry<String,String> entry : Courses.entrySet())
{
if(entry.getValue().contains(title))
return
entry;
}
}
/**
* Returns a reference to the Student whose name equals
to the argument. This
* method searches in the students stored in the
HashMap {@code students} to
* find the student whose name equals to the argument
{@code name}. If the
* student is not found, {@code null} is
returned.
*
* @param name the student name
* @return the student whose name is specified in the
argument, or {@code null}
* if the student is not found
*/
public static Student getStudentByName(String name)
{
if(!students.containsValue(name))
return null;
for
(Map.Entry<String,String> entry : students.entrySet())
{
if(entry.getValue().contains(name))
return
entry;
}
}
/**
* Add a new student entry to {@code students}
HashMap.
*
* @param id id of the new student
* @param student object of the new student
* @throws Exception if the new {@code id} exists in
the {@code students}
* HashMap
*/
public static void addStudent(String id, Student
student) throws Exception {
student temp = new student(id,
student);
students.put(c.getCode(),
c);
}
/**
* Remove an existing student entry from {@code
students} HashMap.
*
* @param id the 'id' of the student to be
removed
* @throws Exception if the {@code id} does not exist
in the {@code students}
* HashMap
*/
public static void removeStudent(String id) throws
Exception {
for
(Map.Entry<String,String> entry : students.entrySet())
{
if(entry.getValue().contains(name))
students.remove(entry.getKey());
}
}
/**
* Returns the entry in the {@link offerings} list that
has the information
* provided in the arguments. If the entry is not
found, {@code null} is
* returned.
*
* @param courseCode the code of the course
offered
* @param section section of the course
* @param term term
* @param year year
* @return Returns the entry in the {@link offerings}
list that has the
* information provided in the arguments
*/
public static CourseOffering getCourseOffering(String
courseCode, && char section, char term, int year) {
for (String temp :
offerings)
{
if(temp.contains(courseCode) && temp.contains(courseCode)
&& section.contains(term) &&
temp.contains(year))
{
return temp;
}
}
return null;
}
public static void main(String[] args) {
// Reading the list of course
from the file COURSES_FILE
readCourses();
if (courses.isEmpty())
System.err.println("courses shall not be empty");
// Reading the list of
course from the file STUDENTS_FILE
readStudents();
if (students.isEmpty())
System.err.println("students shall not be empty");
// add few offerings
addOfferings();
if (offerings.isEmpty())
System.err.println("offerings shall not be empty");
CourseOffering courseOffer1
= getCourseOffering("EECS2030", 'A', 'W', 2020);
if (courseOffer1 != null)
{
//
enroll the student whose name is "Maximilian" in the first
offering
Student s = getStudentByName("Maximilian");
if (s
!= null) {
try {
enroll(s, courseOffer1);
System.out.println(s + " is enrolled in " + courseOffer1);
} catch (Exception e) {
System.err.println("Was unable to enroll " + s + " in " +
courseOffer1 + "\n" + e.getMessage());
}
} else
{
System.err.println("Student Maximilian is not found");
}
s =
getStudentByName("Alphonso");
if (s
!= null) {
try {
enroll(s, courseOffer1);
System.out.println(s + " is enrolled in " + courseOffer1);
} catch (Exception e) {
System.err.println("Was unable to enroll " + s + " in " +
courseOffer1 + "\n" + e.getMessage());
}
} else
{
System.err.println("Student Maximilian is not found");
}
} else {
System.err.println("Course EECS2030 is not offered in
W2020");
}
}
/**
* Populate the course offerings list with few
entries.
*/
public static void addOfferings() {
offerings.add(new
CourseOffering(courses.get("EECS1021"), 20, 'F', 'A', 2020,
LocalDate.of(2020, 9, 30)));
offerings.add(new
CourseOffering(getCourseByTitle("Object Oriented Programming"), 20,
'F', 'B', 2020,
LocalDate.of(2020, 9, 30)));
offerings.add(new
CourseOffering(courses.get("EECS1022"), 30, 'F', 'A', 2020,
LocalDate.of(2020, 9, 30)));
offerings.add(new
CourseOffering(courses.get("EECS2030"), 15, 'W', 'A', 2020,
LocalDate.of(2020, 9, 30)));
}
/**
* Read a list of courses from the file {@link
COURSES_FILE} and populate
* {@code course} HashMap.
*/
public static void readCourses() {
Scanner inputStream =
null;
try {
inputStream = new Scanner(new FileInputStream(PATH +
"/eecs2030/lab4/" + COURSES_FILE));
} catch (FileNotFoundException
e) {
System.out.println("File Courses.csv was not found");
System.out.println("or could not be opened.");
System.out.println(e.toString());
System.exit(0);
}
String line;
while (inputStream.hasNext())
{
line =
inputStream.nextLine();
String[] info = line.split(",");
Course
c = new Course(info[0].trim(), info[1].trim());
if
(info.length > 2) {
String[] preList = info[2].split(";");
for (String p : preList)
c.addPrerequisite(p.trim());
}
courses.put(c.getCode(), c);
}
inputStream.close();
}
/**
* Read a list of students from the file {@link
STUDENTS_FILE} and populate
* {@code students} HashMap.
*/
public static void readStudents() {
Scanner inputStream =
null;
try {
inputStream = new Scanner(new FileInputStream(PATH +
"/eecs2030/lab4/" + STUDENTS_FILE));
} catch (FileNotFoundException
e) {
System.out.println("File " + STUDENTS_FILE + " was not
found");
System.out.println("or could not be opened.");
System.out.println(e.toString());
System.exit(0);
}
String line;
while (inputStream.hasNext())
{
line =
inputStream.nextLine();
String[] s = line.split(",");
String
id = s[0].trim();
String
name = s[1].trim();
int y
= Integer.parseInt(s[2].trim());
int m
= Integer.parseInt(s[3].trim());
int d
= Integer.parseInt(s[4].trim());
String
email = s[5].trim();
LocalDate joinDate = LocalDate.of(y, m, d);
Student stu = new Student(id, name, joinDate, email);
if
(s.length > 6) {
String[] cc = s[6].split(";");
for (String w : cc) {
stu.completeCourse(w.trim());
}
}
students.put(stu.getId(), stu);
}
inputStream.close();
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How to complete these methods: /** * Returns a reference to the course with title equals to the argument. This * m...
How to complete this methods: import java.io.FileInputStream; import java.io.FileNotFoundException; import java.time.LocalDate; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Scanner; import java.util.Set; /** * Utility class that deals with all the other classes. * * @author EECS2030 Summer 2019 * */ public final class Registrar { public static final String COURSES_FILE = "Courses.csv"; public static final String STUDENTS_FILE = "Students.csv"; public static final String PATH = System.getProperty("java.class.path"); /** * Hash table to store the list of students using their...
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