help with java problem

Question

this is a question for my school work i dont want the complete answer but how i should go about doing each part or help clarifying what the question is asking for

In the following method, the call to getCreditCardNumber() may throw an InvalidLengthException, a NonNumericException or an InvalidCardNumberException. Modify the method to do the following:
a. Catch the InvalidLengthException and print the message “Card number must be 16 digits.”
b. Catch the NonNumericException and print the message “Card number must be numbers only.”
c. Pass the InvalidCardNumberException on to the calling method. In other words, don’t catch it, but let any calling method that uses this method know that it may throw InvalidCardNumberException.

public void getOrderInformation() 
{
    getCreditCardNumber();
}

The instructions are already pretty clear. Is there any part in particular that doesn't make sense to you? — Brendan Long
– Brendan Long, Commented May 11, 2011 at 2:39

Tom Chandler · Accepted Answer · 2011-05-11 02:38:25Z

4

Here's the official documentation on exceptions. It's pretty short and the things you're trying to do are laid out in there.

answered May 11, 2011 at 2:38

Tom Chandler

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Jason McCreary · Accepted Answer · 2011-05-11 02:46:14Z

1

Without providing exact code, per your request, you'll need to wrap your call to getCreditCardNumber() in a try/catch block using mutliple catch statements.

This how Java, and other languages, perform exception handling. Read this quick tutorial and give it a shot.

edited May 11, 2011 at 2:46

answered May 11, 2011 at 2:39

Jason McCreary

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Comments

MicronXD · Accepted Answer · 2011-05-11 02:46:33Z

-1

You mean this? o.0

public void getOrderInformation() throws InvalidCardNumberException
{
    try
    {
        getCreditCardNumber();
    }
    catch(InvalidLengthException e)
    {
        System.out.println("Card number must be 16 digits.");
    }
    catch(NonNumericException e)
    {
        System.out.println("Card number must be numbers only.");
    }
}

edited May 11, 2011 at 2:46

answered May 11, 2011 at 2:36

MicronXD

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2 Comments

MByD Over a year ago

OP asked for help, not an answer, and surely not inaccurate answer.

MicronXD Over a year ago

If he didn't want the answer, he'd have left out the specifics :P

Suroot · Accepted Answer · 2011-05-11 02:48:03Z

-1

Here is the answer for all of these together; you can take it apart to see what I did.

public void getOrderInformation() throws InvalidCardNumberException
{
  try {
    getCreditCardNumber();
  } catch(InvalidLengthException ex) {
    System.err.println("Card number must be 16 digits.");
  } catch(NonNumericException ex) {
    System.err.println(“Card number must be numbers only.”);
  }
}

answered May 11, 2011 at 2:48

Suroot

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1 Comment

Suroot Over a year ago

This is not the answer as there are three separate sections. This is what would happen if you combined it all; he must dissect it to understand why each part works.

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