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From: bill <bill@newsguy.com>
Subject: Re: Why both "with" and "use"?
Date: 1999/02/13
Message-ID: <7a4j3h$64e@drn.newsguy.com>#1/1
X-Deja-AN: 444054758
References: <36C5B28C.F32C43A4@jps.net> <7a4f85$rh1$1@remarQ.com>
Organization: Newsguy News Service [http://www.newsguy.com]
Newsgroups: comp.lang.ada
Date: 1999-02-13T00:00:00+00:00
List-Id: <comp.lang.ada>

In article <7a4f85$rh1$1@remarQ.com>, "Pat says...
>
 
..good stuff snipped..

thanks for the nice review.

Just to compare this to Java, in Java, almost everyone does something
like this:

import package_name;*

this imports, and at the same time, makes visible all class in package
and all public entities in all classes.

One can import one specific class from the package:

import package_name.class_name

And this also combines importing and making directly visible all public
entities in the class. 

Also, in Java a package seems to have different purpose than with Ada. In
Java a package is a collection of classes. In OO Ada, a package usually
contains one tagged type. or is this not the normal practice?

I feel that the Ada package and the "with" and the "use" give better
control of things. Not only that, the fact that in Java, one can
compile a program that uses some class, but becuase classes
are loaded at run time, it is possible to load the old byte code of
compiled against class if the class path is wrong, or if the new byte
code for the compiled class was not jarred correctly.  I fee the whole
development and software packaging with Java is a pain and can lead to
errors. In classical development (as in C/C++/Ada etc..) these kinds
of problems do not happen as much (even with dynamic shared libraries,
there is a check done against version numbers of libraries at load/run
time to make sure the correct library code is loaded).

Bill