[1823] in java-interest
questions
daemon@ATHENA.MIT.EDU (Frank Greco)
Mon Sep 18 16:11:27 1995
Date: Mon, 18 Sep 95 12:39:41 EDT
From: fgreco@lehman.com (Frank Greco)
To: java-interest@java.sun.com
Over the weekend, I went over some of the Java documentation (btw, I
know HTML is nice with a browser, but a *real* PS [not HTML in PS
format] version is nice for those who commute via a long train ride
sans laptop). I had a few questions:
1. What is the equivalent in J/HJ of writing CGI-scripts? How does
one grab input from a local "form" and pass it to a remote machine
for processing?
2. The docs (McGilton/Gosling) mention remote invocation of methods.
How does one do this in Java? I didn't see any reference to
this in any other documentation. I'd like for one Java object
to invoke a method in another; and both objects are distributed
(ie, non-local).
3. To perform the functional equivalent of multiple inheritance, the
docs say to use "interfaces" (talk about overloading...). But it
seems to me that interfaces are merely a way to collect or organize
functions in a class-ish way. A bottom line question: How does
one inherit a method from one object *and* a method from another object
where both objects are from a third-party package?
4. What is exactly meant by "package of a file" or "to package"? The
docs are quite ambiguous. Does it merely mean to include a class
into a module, similar to archiving?
5. If, during the course of running an application/applet, a Java pgm
needs to instantiate superclasses, where "path" does it use to get
the superclasses? Can I instruct the app to get it from another
URL in the web?
6. Does Java have a mechanism of versioning classes? That is, how can
a user of a Java app[let] continue to use an older version of a
particular class when I (as app author) upgrade my app[let].
Excuse the gross analogy, but is there an equivalent of
LD_LIBRARY_PATH for Java classes?
7. How does one pass-by-value in Java to maintain good software
engineering style?
Thanks,
Frank G.
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