Tried to post the entire project here, but moderator said no.
Apparently we're not allowed to post large volumes of code, just small
snippets?
The project is 3 classes (StudentRecordExample.java[MAIN],
StudentRecord.java,Student.java), which have been modified from the
original MyStudentRecordExampleProject so its a bit bulky and could do
with a lot of streamlining, but I figure it should work anyways. As
said the error I'm getting is:
Exception in thread "main" java.lang.NullPointerException
at StudentRecordExample.main(StudentRecordExample.java:35)
Java Result: 1
I used the 'new' keyword to create an instance of a Student object
like so in StudentRecordExample.java:
Student anna = new Student();
Then to set the name variable for object anna of class Student, I
used:
anna.studentRecord.setName("Anna");
which as I understand it gets method setName from class studentRecord.
Do I have to explicitly link classes Student and StudentRecord some
how for this to work? BTW this line of code where I set anna's name
variable is highlighted when I click on the error, and is on line 35.
On May 14, 6:00 pm, Nic Fox <f...@nicfox.com> wrote:
> Without seeing your code it's hard to say.
>
> So you've used the 'new' keyword to make an instance of a Student
> object?
> E.g. Student anna = new Student();
>
> And then you use something like:
> anna.name = "Anna";
>
> If you've done those things then it could be an issue with variable
> scope perhaps?
>
> On 14/05/2010, at 11:47 PM, JKay wrote:
>
>
>
> > I keep getting the following error when I run my program:
>
> > Exception in thread "main" java.lang.NullPointerException
> > at StudentRecordExample.main(StudentRecordExample.java:35)
>
> > I looked up what java.lang.NullPointException is in the API and found
> > this:
>
> > "public class NullPointerException
> > extends RuntimeException
>
> > Thrown when an application attempts to use null in a case where an
> > object is required. These include:
>
> > * Calling the instance method of a null object.
> > * Accessing or modifying the field of a null object.
> > * Taking the length of null as if it were an array.
> > * Accessing or modifying the slots of null as if it were an array.
> > * Throwing null as if it were a Throwable value.
>
> > Applications should throw instances of this class to indicate other
> > illegal uses of the null object."
>
> > Which as far as I understand means that I'm trying to do something
> > with a null object. Said object is object anna of class Student, and
> > the method on the line that is throwing the exception is me attempting
> > to set the name variable for anna to "Anna"
>
> > Any ideas?
>
> > James
>
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