Re: About java program.

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <>
Fri, 05 Jul 2013 22:03:53 -0400
On 7/5/2013 5:15 PM, Robert Klemme wrote:

On 05.07.2013 10:13, lipska the kat wrote:

private boolean askYesNoquestion (String str) throws

    boolean result = false;

    if(null == str){
        logger.log("Argument is null");
        throw new BadArgumentException("Argument is null");
           result = true;
        else if(!str.equals("no")){
            logger.log("Incorrect Argument, argument is " + str);
            throw new BadArgumentException("argument is " + str);
    return result;

This is *one* way of doing it

Overkill ... no, defensive yes.

This example demonstrates what I will call bad practice: the exception
is thrown so the calling code can decide how to handle the error. It
may actually be that the caller can perfectly deal with that situation
and proceed normally. Method askYesNoquestion() cannot know this. But
because the method does the logging itself you'll end up seeing messages
in a log file for things which are not noteworthy. I say, either log
and deal with the error locally OR throw an exception containing a
meaningful message - but not both. That is misleading.

I do not agree with the last point.

If we look at the matrix:

            caller logs caller do not log
log insignificant extra log entry fine
not log fine big problem troubleshooting

then it seems obvious to me to log anyway. Worst case by logging
is not nearly as bad as worst case not logging.


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