I need a UML diagram for this application and comment lines written into the code that explain what is happening at each line.

Course Registration System

Client.java

import javax.swing.JOptionPane;

import java.util.ArrayList;

public class Client $\{$

public static void main$($String$[]$ args$)\{$

ArrayList students $=$ new ArrayList$<>()$;

ArrayList courses $=$ new ArrayList$<>()$;

ArrayList teachers $=$ new ArrayList$<>()$;

teachers.add$($new Teacher$("$John Doe"$))$;

teachers.add$($new Teacher$("$Jane Smith"$))$;

courses.add$($new Course$("$Math$",$ teachers.get$(0)))$;

courses.add$($new Course$("$Science$",$ teachers.get$(1)))$;

while $($true$)\{$

String name $=$ JOptionPane.showInputDialog$("$Enter student name:"$)$;

if $($name $==$ null $||$ name.isEmpty$())$ break;

Student student $=$ new Student$($name$)$;

students.add$($student$)$;

String$[]$ courseOptions $=$ new String$[$courses$.$size$()]$;

for $($int i $=0$; i $<$ courses.size$()$; i$++)\{$

courseOptions$[$i$]=$ courses.get$($i$).$getCourseName$()$;

$\}$

String courseName $=($String$)$ JOptionPane.showInputDialog$($null$,$ "Select course:",

"Course Selection", JOptionPane.QUESTION$\_$MESSAGE, null, courseOptions, courseOptions$[0])$;

for $($Course course : courses$)\{$

if $($course$.$getCourseName$().$equals$($courseName$))\{$

student.enrollCourse$($course$)$;

break;

$\}$

$\}$

JOptionPane.showMessageDialog$($null$,$ student.toString$())$;

int continueOption $=$ JOptionPane.showConfirmDialog$($null$,"$Do you want to continue?"$)$;

if $($continueOption $!=$ JOptionPane.YES$\_$OPTION$)$ break;

$\}$

$\}$

$\}$

Student.java:

import java.util.ArrayList;

public class Student $\{$

private String name;

private int studentID;

private ArrayList enrolledCourses;

public static int studentCount $=0$;

public Student$($String name$)\{$

this.name $=$ name;

this.studentID $=++$studentCount;

this.enrolledCourses $=$ new ArrayList$<>()$;

$\}$

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

enrolledCourses.add$($course$)$;

$\}$

public String getName$()\{$

return name;

$\}$

public void setName$($String name$)\{$

this.name $=$ name;

$\}$

@Override

public String toString$()\{$

return "Student ID: $"+$ studentID $+"$

Name: $"+$ name $+"$

Enrolled Courses: $"+$ enrolledCourses;

$\}$

$\}$

Course.java:

public class Course $\{$

private String courseName;

private int courseID;

private Teacher teacher;

private static int courseCount $=0$;

public Course$($String courseName, Teacher teacher$)\{$

this.courseName $=$ courseName;

this.teacher $=$ teacher;

this.courseID $=++$courseCount;

$\}$

public String getCourseName$()\{$

return courseName;

$\}$

public void setCourseName$($String courseName$)\{$

this.courseName $=$ courseName;

$\}$

@Override

public String toString$()\{$

return "Course ID: $"+$ courseID $+"$

Course Name: $"+$ courseName $+"$

Teacher: $"+$ teacher;

$\}$

$\}$

Teacher.java:

public class Teacher $\{$

private String name;

private int teacherID;

private static int teacherCount $=0$;

public Teacher$($String name$)\{$

this.name $=$ name;

this.teacherID $=++$teacherCount;

$\}$

public String getName$()\{$

return name;

$\}$

public void setName$($String name$)\{$

this.name $=$ name;

$\}$

@Override

public String toString$()\{$

return "Teacher ID: $"+$ teacherID $+"$

Name: $"+$ name;

$\}$

$\}$