Java Exception Help

[Stellios]

Hi guys,

Im having a spot of bother with a bit of exception handling ive got to do for uni, is it possible for someone to give me a bit of advise on where im going wrong please.


Driver Class

public class ExceptionHomeworkDriver
{
	public static void main ( String [] args)
	{
	     ExceptionHomework exHmwk = new  ExceptionHomework();
	     exHmwk.Data();
	     System.out.println("Good Bye");
	}
}

public class ExceptionHomework
{

    Scanner scan ;
    int data;
    int slot;
    int[] value;

    public ExceptionHomework()
    {
        scan = new Scanner( System.in );
        data=0;
        slot=0 ;
        value = new int[10];
    }

    public void Data()
    {
    	do
    	{
    		try
    		{
      			System.out.print("Enter the data: ");
      			data = scan.nextInt();
      			System.out.print("Enter the array index: ");
      			slot = scan.nextInt();
      			value[slot] = data;	
      		}
      		catch (NumberFormatException nfe)
			{
		 		System.out.println("Exception "+nfe.toString()+ " caught\n");
			}
		
		}
		while(!done);
	}
}

This is the error im getting

D:\Uni\Semester 2\Java\Hmwk8\Homework8\ExceptionHomework.java:50: cannot find symbol
symbol  : variable done
location: class ExceptionHomework
		while(!done);

Any help/advice greatly appreciated.

 

[SoapSurgeon]

hi,

I think your problem is that the while(!done) part is inside your do loop. If memory serves it should look like this:

do
{
//some stuff
}while(!done)

but you have this:

do
{
//some stuff
while(!done);
}

 

[Visage]

The error message tells you all you need to know - you havent defined the variable 'done'.....

 

[RobH]

Yeah, 'done' should be a boolean variable defined somewhere in your class. It should be set to true somewhere in the do...while loop to cause an exit condition.

 

[Stellios]

Whoops, im bright

Cheers guys