Re: nullPointerException in abstract class
OldPro wrote:
On Oct 1, 8:43 am, Lew <l...@lewscanon.com> wrote:
OldPro wrote:
As far as the
Date class; it is a custom class that I was required to use from the
textbook, not the official Java class.
You might have seen this as worth mentioning in the first place.
Had you provided an SSCCE (Short Self-Contained Complete Example) that would
have been revealed, along with the likely source of the error. Leaving out
critical details, like that the line where the error occurs isn't using the
class you seem to be showing, disempowers everyone from helping you.
--
Lew
When you are new, it is difficult to know what is worth mentioning. I
am reluctant to use an SSCCE, except as a last ditch effort, as it is
the most time consuming way to isolate an error. I seldom had to do
this in Visual Basic. Perhaps I should rethink this with Java; it may
be too complex to debug using the method with which I am accustomed.
I don't think anyone ever asked me for a SSCCE at the Visual Basic
site... errors were usually obvious to the more experienced...
The problem is that Java is a bit more complex and expressive than
Visual Basic, and therefor the same "snippet" of code can have a
different effect depending on context. Generally, the very least you
should do is show every line in the stack trace up to the point where
*your* code is mentioned, and then present that entire section of your
source code. If you are using anything non-standard (such as a Date
class that isn't java.util.Date), that should also be mentioned, and an
appropriate reference should be given if possible (source code or website)
Let me affirm, lest you think me ungrateful, that I appreciate your
attention and the attention of all those who responded. I requested
help only after doing a thorough Use Net search, which brought me no
clue as to the cause of my predicament.
Again, thank you for your efforts.
And we all appreciate that you've tried to solve this on your own. It
can be frustrating to "do someones homework", but its rewarding to help
someone understand how to do their own homework. You know, teach a man
to fish.
Good luck,
Daniel.
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Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>