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Mar 26th, 2009

How can I create a runtime error?

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This is my code:

Java Syntax (Toggle Plain Text)
public boolean SetYear (String year)
{
		if (year.matches("[0-9]{4}"))
		{ 
		_year=year;
		return true;
                }
    return false;
}
public boolean SetYear (String year)
{
		if (year.matches("[0-9]{4}"))
		{ 
		_year=year;
		return true;
                }
    return false;
}

Instead of return false I want to make a runtime error with my massage. Something like "the value must be 4 digits"
How can I do it?

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stewie griffin

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Mar 26th, 2009

Re: How can I create a runtime error?

You throw an exception.

Ezzaral

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Mar 26th, 2009

Re: How can I create a runtime error?

Specifically, you probably want to throw an IllegalArgumentException. You can set whatever message you want in the constructor.

Ezzaral

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Mar 27th, 2009

Re: How can I create a runtime error?

Or if you want to generate any old runtime error, I've learned plenty of ways to do that in my time programming.

One of the most common is indexing an array by an index too low or too high

BestJewSinceJC

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Mar 27th, 2009

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Re: How can I create a runtime error?

Define your own exception handler and use try/catch

jbennet

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Mar 27th, 2009

Re: How can I create a runtime error?

Quote ...

Define your own exception handler and use try/catch

Most probably you mean define his own (custom) exception class, but this would be just an overkill.
Ezzaral's suggestion of throwing an IllegalArgumentException for me hits the nail on the head.

stephen84s

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Mar 27th, 2009

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Re: How can I create a runtime error?

He wants a custom error message so it seems like a better idea

jbennet

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Mar 27th, 2009

Re: How can I create a runtime error?

Last edited by stephen84s; Mar 27th, 2009 at 6:05 am.

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Re: How can I create a runtime error?

Click to Expand / Collapse Quote originally posted by jbennet ...

He wants a custom error message so it seems like a better idea

You can set the "message" for most (if not all) inbuilt exceptions including the IllegalArgumentException (for whom this constructor can be used which was also mentioned by Ezzaral in his second post).

Last edited by stephen84s; Mar 27th, 2009 at 6:18 am.

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Re: How can I create a runtime error?

Yes, generally you only need to create a custom exception if you are wanting to pass along additional information that wouldn't be possible with one of the standard exceptions.

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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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