Class differences between 2 compilations of the same source code

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Fran?ois Chastanet - 03 Sep 2004 17:01 GMT

Hello,

First, I need to know if 2 successives compilations of the same source code
give the same class file? I test it, it seems to be true, but is it specific
to my JDK version ?

Second, is there a difference between 2 compilations with 2 differents JDKs?
Is there a documentation that describe those differences ?

Thanks in advance,
Fran?ois Chastanet

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Andrew Thompson - 04 Sep 2004 04:39 GMT

On Fri, 3 Sep 2004 18:01:55 +0200, François Chastanet wrote:

> First, I need to know if 2 successives compilations of the same source code
> give the same class file?

Yes. If they are compiled with the same arguments.

> I test it, it seems to be true, but is it specific
> to my JDK version ?

It's specific to the arguments you give to javac.
<http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/javac.html#options>

HTH

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Andrew Thompson
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Chris Uppal - 04 Sep 2004 08:55 GMT

> First, I need to know if 2 successives compilations of the same source
> code give the same class file? I test it, it seems to be true, but is it
> specific to my JDK version ?

Not necessarily. The Sun compilers do seem to have this property in fact, but
it's not guaranteed that I know of (althoug it /may/ be a concious design aim).
Other compilers may not behave the same way. For instance, see:

http://groups.google.com/groups?threadm=bq2p0a%243ol%241%40news-reader2.wanadoo.fr

> Second, is there a difference between 2 compilations with 2 differents
> JDKs?

Yes.

> Is there a documentation that describe those differences ?

None that I know of.

-- chris

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Class differences between 2 compilations of the same source code

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