import java.io$.*$;

import java.util.Stack;

class DelimiterChecker $\{$

private BufferedReader reader;

private int lineNumber $=1$;

private int charNumber $=0$;

public DelimiterChecker$($String fileName$)$ throws FileNotFoundException $\{$

reader $=$ new BufferedReader$($new FileReader$($fileName$))$;

$\}$

public Character getNextCharacter$()$ throws IOException $\{$

int charCode;

char character;

while $(($charCode $=$ reader.read$())!=-1)\{$

charNumber$++$;

character $=($char$)$ charCode;

$//$ Check for comments, literals, and skip

if $($character $==\text{'}/\text{'})\{$

if $($reader$.$markSupported$())\{$

reader.mark$(1)$;

char nextChar $=($char$)$ reader.read$()$;

if $($nextChar $==\text{'}/\text{'})\{$

$//$ Single$-$line comment, skip until the end of the line

while $($character $!=\text{'}$

$\text{'}$ && charCode $!=-1)\{$

charCode $=$ reader.read$()$;

character $=($char$)$ charCode;

charNumber$++$;

$\}$

lineNumber$++$;

charNumber $=0$;

$\}$ else if $($nextChar $==\text{'}*\text{'})\{$

$//$ Multi$-$line comment, skip until $"*/"$

boolean commentEnd $=$ false;

while $(!$commentEnd && charCode $!=-1)\{$

charCode $=$ reader.read$()$;

character $=($char$)$ charCode;

charNumber$++$;

if $($character $==\text{'}*\text{'})\{$

reader.mark$(1)$;

char next $=($char$)$ reader.read$()$;

if $($next $==\text{'}/\text{'})\{$

commentEnd $=$ true;

$\}$

$\}$ else if $($character $==\text{'}$

$\text{'})\{$

lineNumber$++$;

charNumber $=0$;

$\}$

$\}$

$\}$ else $\{$

reader.reset$()$;

return character;

$\}$

$\}$ else $\{$

return character;

$\}$

$\}$ else if $($character $==\text{'}"\text{'})\{$

$//$ String literal, skip until the closing double quote

while $(($character $!=\text{'}"\text{'}||($character $==\text{'}"\text{'}$ && charCode $>0$ && $($char$)$ reader.read$()==\text{'}\backslash \backslash \text{'}))$ && charCode $!=-1)\{$

charCode $=$ reader.read$()$;

character $=($char$)$ charCode;

charNumber$++$;

$\}$

$\}$ else if $($character $==\text{'}\backslash \text{'}\text{'})\{$

$//$ Character literal, skip until the closing single quote

while $(($character $!=\text{'}\backslash \text{'}\text{'}||($character $==\text{'}\backslash \text{'}\text{'}$ && charCode $>0$ && $($char$)$ reader.read$()==\text{'}\backslash \backslash \text{'}))$ && charCode $!=-1)\{$

charCode $=$ reader.read$()$;

character $=($char$)$ charCode;

charNumber$++$;

$\}$

$\}$ else if $($character $==\text{'}$

$\text{'})\{$

lineNumber$++$;

charNumber $=0$;

$\}$ else $\{$

return character;

$\}$

$\}$

return null; $//$ End of file

$\}$

public String getCurrentPosition$()\{$

return "Line $"+$ lineNumber $+",$ Char $"+$ charNumber;

$\}$

$\}$

public class DelimiterMatching $\{$

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

BufferedReader keyboard $=$ new BufferedReader$($new InputStreamReader$($System$.$in$))$;

String fileName;

DelimiterChecker delimiterChecker;

while $($true$)\{$

try $\{$

System.out.print$("$Enter the filename: $")$;

fileName $=$ keyboard.readLine$()$;

delimiterChecker $=$ new DelimiterChecker$($fileName$)$;

break;

$\}$ catch $($FileNotFoundException e$)\{$

System.out.println$("$File not found. Please try again."$)$;

$\}$ catch $($IOException e$)\{$

System.out.println$("$Error reading input. Please try again."$)$;

$\}$

$\}$

Stack delimiterStack $=$ new Stack;

Character currentChar;

int position $=1$;

try $\{$

while $(($currentChar $=$ delimiterChecker.getNextCharacter$())!=$ null$)\{$

if $("([\{".$contains$($currentChar$.$toString$()))\{$

delimiterStack.push$($currentChar$)$;

$\}$ else if $(")]\}".$contains$($currentChar$.$toString$()))\{$

if $($deli a$.$ A UML class diagram that includes all classes you