如何更正Java中的非法参数异常？

Question

每当我打开infile2.dat时，程序都会生成以前的错误。我不确定错误是在这个类中，还是在另一个类中。我已经玩过它，但似乎无法弄明白。如果有人能帮助我，我会非常感激。

我的代码中收到以下错误：

Exception in thread "main" java.util.NoSuchElementException
Just caught an illegal argument exception. 
Just caught an illegal argument exception. 
at java.util.Scanner.throwFor(Scanner.java:862)
at java.util.Scanner.next(Scanner.java:1371)
at testfor6.TestFor6.main(TestFor6.java:58)

这是代码（很长时间，我提前道歉）：

public static void main(String[] args) {

 Scanner keyboard = new Scanner(System.in);

    /** holds answer of whether user has more inputs or not */
    char answer;
    /** holds the results when calling inLetter() */
    char letter;
    /** holds the results when checking for types/strings in txt file */
    char inType2;
    /** holds double results when searching line by line the text file */
    double inAmount2;
    /** holds the results when calling inAmount() */
    double amount;
    /** initiates infile to null */
    File infile2;
    /** count system for how many valid lines were read and used */
    int count = 0; 

    /** calls description method */
    description();
    /** initiates new Object */
    NewClass newInput = new NewClass();

    try{
        /** defines new variable linked to .dat file */
        infile2 = new File("GironEvent.dat");
        Scanner fstream = new Scanner(infile2);

        /** calls while loop. As long as there is a line, the loop continues */
        while(fstream.hasNext())
         {
             try
             {
                 /** inputs first string in line of file to variable inType */
                 inType2 = fstream.next().charAt(0);
                 /** inputs first int in line of file to variable inAmount */
                 inAmount2 = Double.parseDouble(fstream.next());

                 /** calls instance method with two parameters */
                 newInput.donations(inType2, inAmount2);
                 /** count ticket increases */
                 count+=1;
             }
             catch (IllegalArgumentException ex) {
                 /** prints out error if exception is caught*/
                 System.out.println("Just caught an illegal argument exception. ");
             }
         }
         /** closes stream between program and fiel */
         fstream.close();
     } 
    catch (FileNotFoundException e){
        /** Outputs error if file cannot be opened. */
        System.out.println("\nGironEvent.dat could not be opened. ");
    }

        /** outputs line count, and totals per type */
        System.out.println("\n" + count + " number of valid lines were read!\n");
        System.out.println("Total Sales: " + newInput.getSale());
        System.out.println("Donations: " + newInput.getDonated());
        System.out.println("Expenses: " + newInput.getExpenses());   

    do{
        /** loop asks user if there is more that needs to be added to the totals. N exits loop. */
        System.out.print("\nAre there any more items to add that were not in the text file? (Type 'Y' or 'N'): ");
        answer = keyboard.next().charAt(0);
        if ((answer == 'y') || (answer == 'y'))
        {
            letter = inLetter();
            amount = inAmount();

            newInput.donations(letter, amount);
        }

    }while (((answer == 'y') || (answer == 'y')));
    /** calls instance method to display totals in a fancy manner */
    newInput.display();
}

/** inLetter - displays types to user. Asks user to input type. Converts input into uppercase letter.
 * 
 * @return resultTwo - Uppercase form of result. Result is the type the user inputted.
 */
public static char inLetter(){
    Scanner keyboard = new Scanner(System.in);
    char result;
    char resultTwo;

    System.out.println("T = Tiket Sales");
    System.out.println("D = Donations");
    System.out.println("E = Expenses");
    System.out.print("Please input an identifier ");
    result = keyboard.next().charAt(0);
    result = Character.toUpperCase(result);

    return result;    
}

/** inAmount - asks user for amount. Tests that amount isn't a negative number or a zero.
 * 
 * @return result - the amount the user inputed. regardless if it was the first or tenth time. 
 */
public static double inAmount(){
    Scanner keyboard = new Scanner(System.in);
    double result;

    System.out.println("Please input an amount ");
    result = keyboard.nextDouble();

    if(result <= 0){
        System.out.print("Please input a positive and non-zero amount ");
        result = keyboard.nextDouble();
    }

    return result;
}
/** description - displays a description of what the program does
 * void.
 */
public static void description(){
    System.out.println("The program will ask you what amount is being spent on what.");
    System.out.println("    ex: expenses, ticket sales, and profts.");
    System.out.println("This program will help determine whether the event generated or lost money.");      
}

-Manny