Course Registration $-$ Revisited import java.util.Scanner; public class ClassSection $\{$ private String courseNumber; private int sectionNumber; private int registrationNumber; private String day; private int startTime; private String$[]$ enrolledStudents $=$ new String$[20]$; private int enrolledCount $=0$; public ClassSection$($String courseNumber, int sectionNumber$,$ int registrationNumber, String day$)\{$ this.courseNumber $=$ courseNumber; this.sectionNumber $=$ sectionNumber; this.registrationNumber $=$ registrationNumber; this.day $=$ day; this.startTime $=9$; $\}$ public int getSectionNumber$()\{$ return sectionNumber; $\}$ public int getRegistrationNumber$()\{$ return registrationNumber; $\}$ public String getDay$()\{$ return day; $\}$ public int getStartTime$()\{$ return startTime; $\}$ public void setStartTime$($int startTime$)\{$ if $($startTime $>=0$ && startTime $<=23)$ this.startTime $=$ startTime; else System.out.println$("$Invalid time."$)$; $\}$ public boolean addStudent$($String studentId$)\{$ if $($getSeatsAvailable$()>0$ && $!$studentIsEnrolled$($studentId$))\{$ enrolledStudents$[$enrolledCount$++]=$ studentId; return true; $\}$ return false; $\}$ public int getEnrolledNumber$()\{$ return enrolledCount; $\}$ public int getSeatsAvailable$()\{$ return enrolledStudents.length $-$ enrolledCount; $\}$ public boolean studentIsEnrolled$($String studentId$)\{$ for $($int i $=0$; i $<$ enrolledCount; i$++)\{$ if $($enrolledStudents$[$i$].$equals$($studentId$))$ return true; $\}$ return false; $\}$ @Override public String toString$()\{$ return courseNumber $+"-"+$ sectionNumber $+"-"+$ registrationNumber $+"-"+$ day $+""+$ startTime $+"$:$00-$ Seats: $"+$ getSeatsAvailable$()$; $\}\}$ public class EnrollmentManager $\{$ public static void main$($String$[]$ args$)\{$ Scanner scanner $=$ new Scanner$($System$.$in$)$; ClassSection$[]$ sections $=\{$ new ClassSection$("$CSCI $111",1,12345,"$M$"),$ new ClassSection$("$CSCI $111",2,23456,"$M$"),$ new ClassSection$("$CSCI $111",3,13456,"$T$"),$ new ClassSection$("$ENG $101",1,20987,"$M$"),$ new ClassSection$("$ENG $101",2,30099,"$W$")\}$; String studentId; while $($true$)\{$ System.out.print$("$Enter your J$-$Number or zero to exit: $")$; studentId $=$ scanner.nextLine$()$; if $($studentId$.$equals$("0"))\{$ System.out.println$("$Goodbye$.")$; break; $\}$ System.out.println$("$Course $-$ Section $-$ Registration $-$ Meets $-$ Available Seats"$)$; for $($ClassSection section : sections$)\{$ System.out.println$($section$)$; $\}$ while $($true$)\{$ System.out.print$("$Select a section or enter zero to return: $")$; String regNumber $=$ scanner.nextLine$()$; if $($regNumber$.$equals$("0"))$ break; boolean registered $=$ false; for $($ClassSection section : sections$)\{$ if $($Integer$.$toString$($section$.$getRegistrationNumber$()).$equals$($regNumber$))\{$ if $($section$.$addStudent$($studentId$))\{$ System.out.println$("$Successfully enrolled in section $"+$ section.getSectionNumber$()+".")$; registered $=$ true; break; $\}$ else $\{$ System.out.println$("$Error: Already enrolled or no seats available."$)$; registered $=$ true; break; $\}\}\}$ if $(!$registered$)$ System.out.println$("$Invalid registration number."$)$; $\}\}$ scanner.close$()$; $\}\}```$ Steps Overview $1.$ Step $0$: Modify the $`$registrationNumber$`$ in $`$ClassSection$`$ to an integer and optionally store the number of enrolled students directly in the object. $2.$ Step $1$: Add a new Java class to populate the database with courses and students. $3.$ Step $2$: Modify the program to pull course data from the database instead of using hardcoded values. $4.$ Step $3$: Save the enrolled student list as a string in the database. $5.$ Step $4$: Load the enrolled students' list from the database at startup and use $`$addStudent$`$ to enroll them. $6.$ Step $5$: Verify student IDs by querying the database before enrollment. $7.$ Step $6$: Celebrate! The program can now persist and load data from the database. Database Interaction $-$ Populate Data: Insert five students and five course sections into the database. $-$ Dynamic Data Fetch: Use database queries to load course data and students dynamically, and update the database with the student enrollments.