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Thread: While try catch loop

  1. #1
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    Default While try catch loop

    I'm trying to program a try/catch exception while loop that continues till the user enters x to exit. So far i've gotten it to work but i'm having one issue with the console printing "Account x cannot be found" before the program exits.

    /**	Murach, J. and Steelman, A., ( 2007).  Murach’s Java SE6,
    	Training and Reference.  Fresno, CA: Mike Murach & Associates.
    	Modifications by Wm Bowers, 2007 – 2011
    	CustomerApp.java interacts with Customer, CustomerIO, Validator
         and NoSuchNumberException
         STARTER Class
    */
     
    import java.util.Scanner;
     
    public class CustomerApp	{
        public static void main(String args[])	    {
    		PriceHeading.getHeading("Assignment 3");//heading call
            // display a welcome message
            System.out.println("  Welcome to the Customer application");
            System.out.println();
     
            // create the Scanner object
            Scanner sc = new Scanner(System.in);
     
            // continue until user enters x
            String custNo = "y";
            while (!custNo.equalsIgnoreCase("x"))	{
                custNo = Validator.getString(sc, "  Enter a customer number (or an \"X\" to quit) ->  ");
                try	{
                    Customer cust = CustomerIO.getCustomer(custNo);
                    System.out.println("\n" + cust.getNameAndAddress());
                }
                catch (NoSuchCustomerException e){	
                	System.out.println(e.getMessage());	  }
            	} 
     
                System.out.println();
     
            }
        }
    public class Customer {
    	public String name, address, city, state, zipCode;
    	public String getNameAndAddress() {
    		return "  " + name + "\n\t\t   "
     
            + address + "\n\t\t   "
     
            + city + ", " + state + " " + zipCode; 
    	}
    }
    class NoSuchCustomerException extends Exception {
    	private String customerNumber;
    	public NoSuchCustomerException()
    	{
    	}
     
    public NoSuchCustomerException(String customerNumber){
    	super("  The customer number " + customerNumber.toUpperCase() + " does not exist");
    }
     
    public String getCustomerNumber(){
    	return customerNumber;
    }
    }


  2. #2
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    Default Re: While try catch loop

    Have you run through this with a debugger to trace what's actually happening?
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  3. #3
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    Default Re: While try catch loop

    I'm no pro with the debugger but I don't get the exception message till the catch statement

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    Default Re: While try catch loop

    Well, I'd recommend learning how to debug sooner rather than later. Most IDEs have a debugger that works pretty intuitively. But basically, you're asking us to do it for you, and we don't really have time to do that. Maybe if you condensed your problem into an SSCCE we could.
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  5. #5
    Super Moderator Norm's Avatar
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    Default Re: While try catch loop

    i'm having one issue with the console printing "Account x cannot be found" before the program exits.
    Where in your program is that message being printed?

  6. #6
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    Default Re: While try catch loop

    At the end right before the press any key console exit message? I'm typing x to exit and its trying to find account x (which doesnt exist) first then it exits.
    Last edited by Duaber; June 23rd, 2011 at 01:17 PM.

  7. #7
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    Default Re: While try catch loop

    Sorry, I meant, where in the code is the message printed. I do not see "Acccount" or "cannot be found" in the code you posted. Is the message printed in some other code?

    Try debugging your code by printing out the values of the variables as they change.

    Can you execute the program and copy the console here.
    To copy the contents of the command prompt window:
    Click on Icon in upper left corner
    Select Edit
    Select 'Select All' - The selection will show
    Click in upper left again
    Select Edit and click 'Copy'

    Paste here.

  8. #8
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    Default Re: While try catch loop

    Sorry Norm I mistyped the exception message.

    Jeremy Price
    Assignment 3
    June 23, 2011

    Welcome to the Customer application

    Enter a customer number (or an "X" to quit) -> p1001

    Barbara White
    3400 Richmond Parkway #3423
    Bristol, CT 06010
    Enter a customer number (or an "X" to quit) -> random
    The customer number RANDOM does not exist
    Enter a customer number (or an "X" to quit) -> x
    The customer number X does not exist

    Press any key to continue . . .
    Last edited by Duaber; June 23rd, 2011 at 01:40 PM.

  9. #9
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    Default Re: While try catch loop

    What does your program do immediately after displaying the message:
    Enter a customer number (or an "X" to quit) ->
    and you enter something?
    What is the next statement executed after it reads your response?

  10. #10
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    Default Re: While try catch loop

    Got it figured out. Used a scanner before the while statement then used another scanner at the end. Continues and ends like it should

  11. #11
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    Default Re: While try catch loop

    Another way is to use the break statement.
    After the user enters his response, use an if statement to see if he entered the quit signal and then break from the while loop.

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