[530] in java-interest
Re: WebObjects
daemon@ATHENA.MIT.EDU (Andrew Wason)
Wed Jun 28 16:45:24 1995
To: java-interest@java.sun.com
In-Reply-To: Message from Ward Harold <0006378709@mcimail.com>
of "Wed, 28 Jun 95 12:23:00 -0500." <22950628172322/0006378709PK2EM@MCIMAIL.COM>
Date: Wed, 28 Jun 95 15:52:41 -0400
From: Andrew Wason <aw@bae.bellcore.com>
Ward Harold <0006378709@mcimail.com> writes:
>
> o test the type of an object at runtime
> - one can do this in Java via 'instanceof' but Modula-3 has a 'typecode'
> primitive that is better suited to this application
You could use Object.getClass() as a type code.
> o allocate an object given a code for its type
> - I assume they are referring to the Modula-3 'typecode'
If you use the Class as a typecode, you can use
Class.newInstance().
> o find the code for the direct supertype given the code for the type
> - ditto
Class.getSuperclass()
> Under 'garbage collection' they require a "hook for calling a cleanup routine
> when an object is garbage collected (or explicitly freed)".
Could java.lang.Ref be used for this? I couldn't get this to
work, but there may be a way to use the Ref to detect when the
Ref'd object is being finalized.
If you only need to hook your own classes, you can implement a
dispose() method in them.
Andrew
_______________________________________________________________________________
Andrew Wason Bell Communications Research
aw@bae.bellcore.com Piscataway, NJ
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