Design Patterns - Observer

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tim@nocomment.com - 07 Oct 2006 01:04 GMT

I have been looking at this pattern and it does make sense to me,
except for one thing.

I thought Java was "pass by value". This pattern seems to me to only
make sense if it is using "pass by reference". Am I missing something
here?

Can you use this pattern with "pass by value"?

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Arne Vajhøj - 07 Oct 2006 01:53 GMT

> I have been looking at this pattern and it does make sense to me,
> except for one thing.
[quoted text clipped - 4 lines]
>
> Can you use this pattern with "pass by value"?

You can use it in Java.

Why should pass by value be a problem ?

Arne

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Manish Pandit - 07 Oct 2006 01:58 GMT

Can you explain the scenario you are trying to address with this
pattern, and the challenge you are facing?

-cheers,
Manish

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Matt Humphrey - 07 Oct 2006 02:02 GMT

>I have been looking at this pattern and it does make sense to me,
> except for one thing.
>
> I thought Java was "pass by value". This pattern seems to me to only
> make sense if it is using "pass by reference". Am I missing something
> here?

Java is pass-by-value and the value passed for an object is its reference.

Matt Humphrey matth@ivizNOSPAM.com http://www.iviz.com/

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tim@nocomment.com - 07 Oct 2006 02:10 GMT

> >I have been looking at this pattern and it does make sense to me,
> > except for one thing.
[quoted text clipped - 6 lines]
>
> Matt Humphrey matth@ivizNOSPAM.com http://www.iviz.com/

Thanks. I was reading up on it and just found it myself.

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Design Patterns - Observer

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