I am currently facing some exceptions with my code and I am not sure how I am able to solve the errors. I am attempting to gather user input using the Scanner class Java but whenever I use it, the console displays:
1. Display Drivers
2. Import Infringement File
3. Generate Suspension Report
4. Save Driver Records
5. Exit Program
Enter a menu choice:
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextByte(Unknown Source)
at java.util.Scanner.nextByte(Unknown Source)
at code.Main.validateChoice(Main.java:109)
at code.Main.main(Main.java:84)
I am using Eclipse, and it is displaying that nothing in my class is actually incorrect and there are no resource leaks to my understanding which can be causing this issue. I have spent a lot of time already trying to solve the issue but I can't manage to fix it.
I tested the same code and it works perfectly on another class file, but something is interfering with it in the main file. If I reference the code statically from another class file, the issue is not resolved and the same exception message displays.
Code is below:
public class Main {
static Scanner userInput = new Scanner(System.in);
public static void main(String[] args) {
// Determine Driver File Location
String fileLocation = "Driver.txt";
File driverFile = new File(fileLocation);
Scanner userInput = new Scanner(System.in);
// If cannot find driver file
while (!driverFile.exists()) {
System.out.println("Cannot find drivers file. \nEnter the correct file location: ");
fileLocation = userInput.nextLine(); // enter user input for file location
}
driverFile = new File(fileLocation);
userInput.close();
// Reading From Drivers
try { // Attempt to read from file
Scanner inputFile = new Scanner(driverFile);
inputFile.useDelimiter(",");
ArrayList<Driver> drivers = new ArrayList<>();
int counter = 0; // Set counter for each iteration
while (inputFile.hasNext()) {
try {
drivers.add(
new Driver(inputFile.nextInt(), inputFile.next(), inputFile.next(), inputFile.next(),
inputFile.next(), inputFile.next(), inputFile.nextShort(), inputFile.nextByte()));
// Enter correct value of last string
String temp = inputFile.nextLine();
if (temp.equals(",Valid")) {
drivers.get(counter).setLicenceStatus("Valid");
}
else if (temp.equals(",Suspended")) {
drivers.get(counter).setLicenceStatus("Suspended");
}
else { // if input was not correct, end input and show an exception has been made
System.out.println("Licence Status incorrect, bad data in file ");
break;
}
// Data check licenceClass
if (drivers.get(counter).verifyLicenceClass() == false) {
System.out.println("Licence Class incorrect, bad data in file ");
break;
}
} catch (InputMismatchException e) {
System.out.println("Bad data in file ");
break;
} // end catch
counter++;
}
inputFile.close();
} catch (FileNotFoundException e) {
System.out.println("The driver file was not found");
} // end missing driver file catch
// Menu Items
String[] firstMenuItems = {"Display Drivers", "Import Infringement File",
"Generate Suspension Report", "Save Driver Records", "Exit Program"};
final int firstMinMenu = 1; // menu values
final int firstMaxMenu = 5;
byte choice;
do {
displayMenu(firstMenuItems);
choice = (byte) validateChoice(firstMinMenu, firstMaxMenu);
// System.out.println("Your menu choice was " + choice);
} while (choice != firstMaxMenu);
} // end main
/*
* Methods
*/
public static void displayMenu(String[] menu) {
for (int i = 0; i < menu.length; i++) {
System.out.println((i + 1) + ". " + menu[i]);
}
System.out.println("Enter a menu choice: ");
}
// Determine if choice is in range
public static int validateChoice(int min, int max) {
int input = 0;
do {
input = userInput.nextByte();
if (input < min || input > max) {
System.out.println("Please enter a menu choice in range");
}
} while (input < min || input > max);
return input;
}
}
Would appreciate any help. Thanks.
Edit: Removing the userInput.close(); near the top of the code fixed it. Also will realized I had multiple userInputs. Thanks for the replies!
