Consider a Course Class that consists of id$,$ title, credit, tuition per credit, number of students

that defines the number of students currently enrolled in this course. It has the seat capacity that

determines the maximum number of students that are allowed in this course. The default capacity

has been set to $3$ but it is increased by increaseSeatCapacity$($int size$)$ method describe

below. $30$

public class Course $\{$

private final static int DEFAULT$\_$CAPACITY $=3$;

private String id;

private String title;

private int credit;

private int tuitionPerCredit;

private int numOfStudent;

private int seatCapacity;

public Course$($String id$,$ String title, int credit, int

tuitionPerCredit$)\{$

this.id $=$ id;

this.title $=$ title;

this.credit $=$ credit;

this.tuitionPerCredit $=$ tuitionPerCredit;

this.seatCapacity $=$ DEFAULT$\_$CAPACITY;

$\}$

$//$ getter and setter methods for instance variables

public void increaseSeatCapacity$($int size$)\{$

this.seatCapacity $=$ this.seatCapacity $+$ size;

$\}$

public void increaseNumberOfStudent$()\{$

numOfStudent$++$;

$\}$

public void decreaseNumberOfStudent$()\{$

numOfStudent$--$;

$\}$

$\}$

CurrentOfferedCourse class forms the pool of academic courses, the university offers. The

pool of courses is put in cList array which has a default capacity of $5$ but it could be increased

dynamically by doubling it if its capacity is exhausted.

Class: CurrentOfferedCourse

addCourse$($course : Course$)$ : void This method will take a Course object as a

parameter and will add it to the array of cList if the

number of courses is less than the array length. If

the capacity exceeded the length, the array pool is

doubled and the course is put there.

getCourse$($course : Course$)$ : Course This method returns a Course object if it is offered

in a semester otherwise returns null.

getCourseList$()$ : Course$[]$ This method will return an array of Course,

containing all the offered courses in a semester.

public class CurrentOfferedCourse $\{$

private Course$[]$ cList;

private int numberOfCourse;

private static CurrentOfferedCourse instance;

public CurrentOfferedCourse$()\{$

cList $=$ new Course$[5]$;

$\}$

public static CurrentOfferedCourse getInstance$()\{$

if$($instance $==$ null$)\{$

instance $=$ new CurrentOfferedCourse$()$;

$\}$

return instance;

$\}$

public int getNumberOfCourse$()\{$

return numberOfCourse;

$\}$

public void addCourse$($Course course$)\{$

$\}$

Code for addCourse

public Course getCourse$($Course course$)\{$

$\}$

public Course$[]$ getCourseList$()\{$

$\}$

$\}$

Question: Write down the code for addCouse, getCourse, getCourseList in script

with comments highlighting the necessity of the line in coding.