[1569] in java-interest
Re: dynamic lists
daemon@ATHENA.MIT.EDU (Christophe Meessen)
Fri Sep 8 06:06:34 1995
Date: Fri, 8 Sep 1995 08:55:49 +0200
To: ser@jersey.in2p3.fr, java-interest@java.sun.com
From: meessen@cppm.in2p3.fr (Christophe Meessen)
At 10:35 07/09/95 -0700, ser@jersey.in2p3.fr wrote:
...
>The crux of matter is,
>
> int x;
>
>refers to an instance of x, whereas
>
> MyClass x;
>
>is a pointer to a non-existant instance of MyClass which I still have to
fill >with
>
> x = new MyClass();
>
>or some similar pointer manipulation.
>Personally, I find inconsistancies like this annoying, but acceptable.
After >all, learning the intricacies of pointers was much more difficult
than >remembering that Some Things Are Always Auto-Instantiated by Java, and
Some >Things Aren't. As long as you observe the casting rules of Java, you
can use >class instance references like pointers in any other language.
I personally don't see any inconsistancies in this syntax.
Because in the specification it is said that it is an error to use the integer
x without having assigned a value to it first.
To be allowed to use a variable you need to instanciate it and it doesn't
matter if it is a base type or not. So I see it as equivalent.
int x = 5;
or
int x;
x = 5;
and with MyClass
MyClass x = new MyClass();
or
MyClass x;
x = new MyClass();
>
>--- SER
Bien cordialement,
Ch.Meessen
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