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- From: "Mark L. Fussell" <email@example.com>
- To: firstname.lastname@example.org
- Date: Sat, 29 Nov 1997 17:19:32 -0800 (PST)
Peter Murray-Rust <email@example.com>:
> I am having a number or problems turning JUMBO into a WORA-compliant animal
You might want to also ask these questions on advanced-java. There are a
lot of good people on that list and your questions are interesting and
applicable [the only ones "questionable" to the charter of the list have
to do with applets, but your code is for both]. I will try to answer
some of them here. All my answers will be 1.1 oriented since this is all
I have been using recently.
> A JDK1.02/JDK1.1.x
> I have refrained from converting to 1.1. since I have been told
> all browsers supported it. Is this still true? Or should I convert now?
I think you will be "trapped" supporting 1.02 for a while if you want to
support as many browsers as possible. For example, I still use Netscape
3.x because it is extremely stable. By my web logs that a lot of 3.x
(and earlier) browsers still out there.
Note that at the VM level there are very, very few changes between 1.0
and 1.1. The real problem is that the class libraries have migrated and
if you migrate also you will not be backward compatible.
> B.1 Is there a function I can call to tell whether I am in an applet or
Yes (maybe) but I don't remember what it is :-( It also somewhat depends
what you want to know. You can find out about the overall environment
with System.getProperties() [if you want to find out about the host VM
which may indicate appletness] and you can find out about the ClassLoader
and SecurityManager from their respective sources. I think the only
object that really knows its an Applet is the Applet itself, so to
propogate this knowledge outward requires either a web of associations to
the Applet or some "static" information. The later can be very clean if
you simply have a registry where you can put applet information (which
obviously includes their existence). It sounds like you are doing
something like that anyway. Again, I recall there existing another
approach but don't remember. Someone on advanced-java would probably know.
> B.2 I use ancillary files located in the *.class directories (e.g
> icon.gif). A nice extension in JUMBO is a per-class schema.xml file, with
> additional class information. Since CLASSPATH may contain many components,
> how can I tell which component was used for the class I am now running, so
> I can locate these files?
If you are in a particular object:
URL url = this.getClass().getResource(relativePathName+fileName);
The relativePathName should be from the current Class (in your case it
would probably be empty).
If you are in a static method you need to explicitly specify the class
URL url = ThisClass.class.getResource...
Because static methods are not connected to any object (they are
completely resolved at compile time).
> D java/jview
> There are significant differences here, especially with
No solutions, just a couple comments. The 100% Pure tester warns about
all hardcoded '/' and '\', so these are obviously considered non-WORA.
For most of these you can use either the functionality within a class
(File concatenation) or the System.properties:
* <dt>file.separator <dd>File separator ("/" on Unix)
* <dt>user.home <dd>User home directory
* <dt>user.dir <dd>User's current working directory
* <dt>java.home <dd>Java installation directory
URL's should generally work with standard URL notation (it is up to the
implementation to work correctly).
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