Fast Question: Index of a Component in another component

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pek - 23 Jul 2007 16:36 GMT

So I have a JPanel that is a container for a number of JLabels. Let's
say I have a reference for a particular JLabel that is in the JPanel's
component list. How can I find the index of the JLabel in the
JPanel..? JPanel has a getComponent(int index). What about the
oposite..?

Sorry for the trouble..

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Roedy Green - 23 Jul 2007 20:21 GMT

>JPanel..? JPanel has a getComponent(int index). What about the
>oposite..?

Not likely. Every time a element were added or deleted, the embedded
index number would have to be updated in every Component. It would be
faster just to scan the component list when you need the reverse
index.

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Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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pek - 24 Jul 2007 01:37 GMT

On Jul 23, 10:21 pm, Roedy Green <see_webs...@mindprod.com.invalid>
wrote:

> On Mon, 23 Jul 2007 08:36:45 -0700, pek <kimwl...@gmail.com> wrote,
> quoted or indirectly quoted someone who said :>JPanel..? JPanel has a getComponent(int index). What about the
[quoted text clipped - 7 lines]
> Roedy Green Canadian Mind Products
> The Java Glossaryhttp://mindprod.com

Oh, I see. I was just wondering if there was a method like List's int
indexOf(T element). Anyway, thnks..

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Roedy Green - 24 Jul 2007 02:56 GMT

>Oh, I see. I was just wondering if there was a method like List's int
>indexOf(T element). Anyway, thanks..

You are SOL. Inside Component you will see
Component component[] = new Component[0];
It is default scope. So if you extended Container, you could not
access the array of children to do the scan.

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Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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Fast Question: Index of a Component in another component

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