Indexed Properties and Population

["Raible, Matt" <Ma...@cable.comcast.com>]

I have an ArrayList on a form... let's call the form Parent and the
ArrayList Children.

If I have:

private ArrayList children;

public void setChildren(int index, ChildForm childForm) {
	this.children.set(index, childForm);
}

Then saving my form results in a NPE for BeanUtils.copyProperties.  If I
create a whole bunch of objects in the ArrayList in the constructor - I
avoid this problem:

public ParentForm () {
    children = new ArrayList(100);
    for (int i=0; i < 100; i++) {
        children.add(new ChildForm());
}

But I'm guessing that this fits better into the reset(mapping, request)
method of my form.  My question is - how do I determine how many there are?
Is there something in the request this this information - or should I set a
hidden field with the number of children?

Thanks,

Matt


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RE: Indexed Properties and Population

[Mark Galbreath <ma...@qat.com>]

int elements = children.size()
?

Where are you defining this method?


-----Original Message-----
From: Raible, Matt [mailto:Matt_Raible@cable.comcast.com] 
Sent: Thursday, January 16, 2003 4:31 PM

If I have:

private ArrayList children;

public void setChildren(int index, ChildForm childForm) {
	this.children.set(index, childForm);
}

My question is - how do I determine how many there are? Is there something
in the request this this information - or should I set a hidden field with
the number of children?



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