NoSuchElementException - completely unable to fix - java.util.scanner

Question

I'm busy developing a relatively simply program.
The program involves the use of a main menu that is created and displayed by a method called: "mainMenu()"; the code for which is contained within in my "Main" class (itself containing the main() method). This method takes input via the scanner and depending upon which option the user inputs, a corresponding method is called.
One of these options is "quit" (option q) which, if the scanner picks up Q as the user input, the mainMenu() method then calls a corresponding method called: "quitProgram().
The quitProgram() method also uses a scanner object (albeit a different one to the one the mainMenu() method uses). It does so becuase, via a prompt, the user is asked: "do you want to quit this program? Yes/No?" and the input to that question is captured by the scanner.
Hopefully you're following all of this ...
It is with respect to the quitProgram() method that I'm having problems. Specifically, a NonSuchElementException is being thrown and if "n" or "no" is inputed. The code excutes perfectly if "yes" or "y" is inputed.
Inputting "no" or "n" should (if I could ever fix this bug), call the mainMenu() method again and take the user back to the main menu except, it doesn't. As intimated, it throws a NoSuchElementException.
I'm hoping that by showing you the code for both methods, you can tell me how to fix the problem.
The mainMenu() method:
public static void mainMenu() {
Scanner sc = new Scanner(System.in); // Create a Scanner object.
boolean userInputCorrect = false; // initialise boolean flag.
String choice; // initialise String for holding user input.
// start do ... while loop
do {
// ask user to input their choice of option:
System.out.println("*********************************************************************************************************" + "\r"
+ "PROGRAMMING ASSIGNMENT:" + "\r"
+ "----------------------" + "\r\n" + "\r\n"
+ "STUDENT ID: 2136272" + "\r"
+ "NAME: William van Zwanenberg" + "\r"
+ "MODULE NAME: LAAM39 - Introduction to Programming" + "\r"
+ "MODULE TUTOR: Dr. Livio Robaldo" + "\r\n" + "\r\n"
+ "DESCRIPTION:" + "\r\n"
+ "------------" + "\r\n"
+ "Program to manage a desk and the items on it as per assignment for LAAM39 - Intro to Programming Module." + "\r\n" + "\r\n"
+ "ASSIGNMENT TITLE:" + "\r\n"
+ "-----------------" + "\r\n"
+ "Implement a Java class \"Desk\" with suitable attributes and methods to put and remove items on the desk " + "\r"
+ "and, optionally, other methods to move the desk, buy&sell the desk, etc. Items are instances of another " + "\r"
+ "Java class \"Item\". By using inheritance among classes, you can then optionally distinguish different " + "\r"
+ "kinds of items (notebooks, pens, pencils, etc.)" + "\r\n" + "\r\n"
+ "**********************************************************************************************************" + "\r\n" + "\r\n"
+ "Please enter the corresponding number for the specific action you'd like the program to perfom." + "\r\n" + "\r\n"
+ "YOUR CHOICE OF OPTIONS ARE:" + "\r\n" + "\r\n"
+ "(1) Create a new desk object;" + "\r\n"
+ "(2) Change the properties of an existing desk object;" + "\r\n"
+ "(3) Add a new stationery item to the desk;" + "\r\n"
+ "(4) Remove an existing stationery item from the desk;" + "\r\n"
+ "(5) Change the properties of an existing stationery item;" + "\r\n"
+ "(6) Move the desk" + "\r\n"
+ "(7) Sell the desk and assign it a new owner." + "\r\n" + "\r\n"
+ "To quit the program, type \"q\"." + "\r\n");
choice = sc.nextLine();
// now instigate switch
switch (choice.toLowerCase()) {
case "1":
case "2":
case "3":
case "4":
case "5":
case "6":
case "7":
case "q":
case "quit":
case "Quit":
case "QUIT":
// change flag becuase user will have made a valid choice
userInputCorrect = true;
// BREAK OUT OF SWITCH
break;
default:
// clear console
clearConsole();
// include countdown delay. Here the for loop merely interates. Nothing more.
for (double i = 1; i<=1000000; i=i+ .01);
// print out error msg:
System.out.println("\r\n" + "ERROR! " + "\""+ choice +"\"" + " is not a valid choice. Please try again." + "\r\n");
} // end of switch
// end the do .. while loop
} while (!userInputCorrect);
// close the Scanner class as we no longer need it.
sc.close();
// flush the content of the buffer to the output stream
System.out.flush();
/*
* If 'q', Q', 'quit', 'Quit', or 'QUIT' is inputed, then quit the program.
* NB: For some reason (UNKNOWN) despite using the 'toLowerCase()'
* String method, the code does not execute
* correctly if "Q" is entered by the user. Therefore, the
* "||" Comparator has been used alongisde the 'equalsIgnoreCase' method in
* to avoid producing an error and forcing the program to quit. This is
* obviously a workaround.
*/
if (choice.equalsIgnoreCase("Q") || choice.equalsIgnoreCase("QUIT")) {
// call quit program method:
quitProgram();
} else {
clearConsole();
System.out.println("\r\n" + "You selected: " + choice);
// now include switch to pass flow to corresponding classes/methods/ depending on the user's selection.
}
} // end of mainMenu() method.
This is the code for the quitProgram() method:
public static void quitProgram() {
//clear console:
clearConsole();
// create a new scanner:
Scanner scan = new Scanner(System.in);
// ask user if thwy wish to quit:
System.out.println("Do you want to quit this program? Yes/no?");
// assign user input to a new String:
String options = scan.nextLine();
// initialise boolean for use in while loop:
boolean matchFound = false;
String regex = "yes|no|y|n"; // searches for "yes", "no", "y", and "n" - CASE INSENSITIVE.
while (matchFound == false) {
Pattern pt = Pattern.compile(regex , Pattern.CASE_INSENSITIVE);
Matcher mt = pt.matcher(options);
if (mt.find() == true) {
// match found, therefore set the boolean to true:
matchFound = true;
} else {
// print out error msg:
System.out.println("Invalid entry. Please try again. Do you want to quit this program? Yes/no?");
// get next entry:
options = scan.next();
}
} // end while loop.
// NOW ACT DEPENDING ON SPECIFIC CHOICE:
// close the scanner:
scan.close();
// flush the content of the buffer to the output stream
System.out.flush();
if (options.equalsIgnoreCase("yes") || options.equalsIgnoreCase("y")) {
// clear the Console
clearConsole();
// print out goodbye message:
System.out.println("GOODBYE :-) This program will now quit");
// wait a short while ...
for (double i = 1; i<=10000000; i=i+ .01); // include countdown delay. Here, the for loop merely interates. Nothing more.
// clear console again:
clearConsole();
// now definitely quit.
System.exit(0);
} else if(options.equalsIgnoreCase("no") || options.equalsIgnoreCase("n")) {
// clear console:
clearConsole();
// flush the content of the buffer to the output stream
System.out.flush();
// print out take to main menu message:
System.out.println("OK. Returning you to the main menu ...");
// clear console again:
clearConsole();
// wait a short while ...
for (double i = 1; i<=100000; i=i+ .01); // include countdown delay. Here, the for loop merely interates. Nothing more.
// return to the main menu.
mainMenu();
}
} // end of quitProgram() method.