DefaultStyledDocument array problem

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Charly Si - 28 May 2006 16:10 GMT

Using Java 5.0
In class PublishStats extends JFrame I have

<<DefaultStyledDocument doc = new DefaultStyledDocument[4];>>

In method public void UpdateFields(String[][] tabDat) I have

<<
for (int i = 0; i < 4; i++)
{
doc[i].insertString(doc[i].getLength(), tabDat[wgr][i], stdStyle);
}
>>

This will not compile:
Incompatible types.
found :javax.swing.text.DefaultStyledDocument[]
required: javax.swing.test.DefaultStyleDocument
with an up arrow under "new"

What am I doing wrong and how can I correct it?

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Bart Cremers - 29 May 2006 07:59 GMT

In DefaultStyledDocument doc = new DefaultStyledDocument[4];
you're trying to assign an array to a variable of type
DefaultStyledDocument. You'll have to declare the variable as an array.

DefaultStyledDocument[] doc = new DefaultStyledDocument[4];

Don't forget you'll need to initialize every element of the array
before you can use it (all elements are 'null' by default).

Bart

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HarryGuy - 29 May 2006 14:36 GMT

Thanks for the help. It now compiles OK, but when I run it I get a
NullPointerExecption on the line reading :

<<wagerDoc[i].insertString(wagerDoc[i].getLength(), tabDat[wgr][i],
stdStyle);>>

Do you have any ideas on that?

> In DefaultStyledDocument doc = new DefaultStyledDocument[4];
> you're trying to assign an array to a variable of type
[quoted text clipped - 6 lines]
>
> Bart

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Oliver Wong - 29 May 2006 21:12 GMT

> Thanks for the help. It now compiles OK, but when I run it I get a
> NullPointerExecption on the line reading :
[quoted text clipped - 3 lines]
>
> Do you have any ideas on that?

Bart answered that one already:

>> Don't forget you'll need to initialize every element of the array
>> before you can use it (all elements are 'null' by default).

If you have a Java textbook handy, you might want to review the section
on arrays. The problem doesn't actually have anything to do with
DefaultStyledDocument.

- Oliver

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Charly Si - 30 May 2006 17:35 GMT

Right! I realized that after I posted. It's working OK now. Thanks to both.

>> Thanks for the help. It now compiles OK, but when I run it I get a
>> NullPointerExecption on the line reading :
[quoted text clipped - 14 lines]
>
> - Oliver

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DefaultStyledDocument array problem

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