Need UML diagram, test cases and lessons learned for program below.

import java.util.$*$;

public class Interval$>\{$

private final T start;

private final T end;

public Interval$($T start, T end$)\{$

this.start $=$ start;

this.end $=$ end;

$\}$

public boolean contains$($T point$)\{$

return point.compareTo$($start$)>=0$ && point.compareTo$($end$)<=0$;

$\}$

public boolean subinterval$($Interval other$)\{$

return other.start.compareTo$($start$)>=0$ && other.end.compareTo$($end$)<=0$;

$\}$

public boolean overlaps$($Interval other$)\{$

return start.compareTo$($other$.$end$)<=0$ && end.compareTo$($other$.$start$)>=0$;

$\}$

$\}$

public class Time implements Comparable $\{$

private final int hours;

private final int minutes;

private final String meridian;

public Time$($int hours, int minutes, String meridian$)$ throws InvalidTime $\{$

if $($hours $<1||$ hours $>12||$ minutes $<0||$ minutes $>59||(!$meridian.equals$("$AM$")$ && $!$meridian.equals$("$PM$")))\{$

throw new InvalidTime$("$Invalid time input"$)$;

$\}$

this.hours $=$ hours;

this.minutes $=$ minutes;

this.meridian $=$ meridian;

$\}$

public Time$($String timeStr$)$ throws InvalidTime $\{$

try $\{$

String$[]$ parts $=$ timeStr.split$("$:$")$;

if $($parts$.$length $!=2)\{$

throw new InvalidTime$("$Invalid time format"$)$;

$\}$

int hours $=$ Integer.parseInt$($parts$[0])$;

int minutes;

String meridian;

if $($parts$[1].$contains$("$AM$"))\{$

meridian $="$AM$"$;

minutes $=$ Integer.parseInt$($parts$[1].$replace$("$AM$","").$trim$())$;

$\}$ else if $($parts$[1].$contains$("$PM$"))\{$

meridian $="$PM$"$;

minutes $=$ Integer.parseInt$($parts$[1].$replace$("$PM$","").$trim$())$;

$\}$ else $\{$

throw new InvalidTime$("$Invalid meridian $($AM$/$PM$)")$;

$\}$

if $($hours $<1||$ hours $>12||$ minutes $<0||$ minutes $>59)\{$

throw new InvalidTime$("$Invalid time range"$)$;

$\}$

this.hours $=$ hours;

this.minutes $=$ minutes;

this.meridian $=$ meridian;

$\}$ catch $($NumberFormatException $|$ ArrayIndexOutOfBoundsException e$)\{$

throw new InvalidTime$("$Invalid time format"$)$;

$\}$

$\}$

@Override

public int compareTo$($Time other$)\{$

int thisTime $=$ this.hours $*60+$ this.minutes;

int otherTime $=$ other.hours $*60+$ other.minutes;

return Integer.compare$($thisTime$,$ otherTime$)$;

$\}$

@Override

public String toString$()\{$

return String.format$("\%02$d:$\%02$d $\%$s$",$ this.hours, this.minutes, this.meridian$)$;

$\}$

$\}$

public class InvalidTime extends Exception $\{$

public InvalidTime$($String message$)\{$

super$($message$)$;

$\}$

$\}$

import javax.swing.$*$;

import java.awt.$*$;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Project$4\{$

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

SwingUtilities.invokeLater$(()->$ createAndShowGUI$())$;

$\}$

private static void createAndShowGUI$()\{$

JFrame frame $=$ new JFrame$("$Time Interval Checker"$)$;

frame.setDefaultCloseOperation$($JFrame$.$EXIT$\_$ON$\_$CLOSE$)$;

JButton compareButton $=$ new JButton$("$Compare Intervals"$)$;

JButton checkTimeButton $=$ new JButton$("$Check Time"$)$;

$//$ Implement action listeners for the buttons

compareButton.addActionListener$($new ActionListener$()\{$

@Override

public void actionPerformed$($ActionEvent e$)\{$

JOptionPane.showMessageDialog$($frame$,$ "Compare Intervals button clicked."$)$;

$//$ Add your logic here for comparing intervals

$\}$

$\})$;

checkTimeButton.addActionListener$($new ActionListener$()\{$

@Override

public void actionPerformed$($ActionEvent e$)\{$

JOptionPane.showMessageDialog$($frame$,$ "Check Time button clicked."$)$;

$//$ Add your logic here for checking time

$\}$

$\})$;

JPanel panel $=$ new JPanel$($new GridLayout$(4,2))$;

$//$ Add buttons to the panel

panel.add$($new JLabel$(""))$;

panel.add$($new JLabel$(""))$;

panel.add$($compareButton$)$;

panel.add$($checkTimeButton$)$;

frame.getContentPane$().$add$($BorderLayout$.$CENTER, panel$)$;

frame.setSize$(300,200)$;

frame.setVisible$($true$)$;

$\}$

$\}$