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Re: What's the difference between and instance and an object?

Cross-posted to 2 groups.

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On Jun 6, 9:33 am, Chad <cdal...@gmail.com> wrote:
> On Jun 6, 9:18 am, Patrick <patr...@antispam.invalid> wrote:
>
> > Le 06/06/2011 18:08, Chad a écrit :
>
> > > How can there be an instance of MyStack when I never made a
> > > constructor for it? That is, I never create a MyStack object.
>
> > You always have a constructor, even if implicit.
> > You created an instance with new MyStack().
>
> Maybe I'm acting like a dweeb about this, but according to the Java
> Docs, when there is no explicit constructor, then the implict
> constructor is Object. I think that is how they say it. So I figured

That is not correct.  I know of no place in any of the standard API's
Javadocs that make any statement that could be understood that way.  I
don't even know where in the Javadocs you would hope to find such a
statement.

> that when I created instance of MyStack with 'new MyStack()', that the
> only instance would be Object since I omitted the MyStack constructor.

No.

When you omit an explicit constructor, one *for that very type* is
provided by the compiler, so the implicit constructor in your case is
'public MyStack()'.

"All classes have at least one constructor. If a class does not
explicitly declare any, the Java compiler automatically provides a no-
argument constructor, called the default constructor."
<http://download.oracle.com/javase/tutorial/java/javaOO/
objectcreation.html>

--
Lew

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What's the difference between and instance and an object? Chad <cdalten@gmail.com> - 2011-06-06 09:08 -0700
  Re: What's the difference between an instance and an object? Chad <cdalten@gmail.com> - 2011-06-06 09:16 -0700
  Re: What's the difference between and instance and an object? Patrick <patrick@antispam.invalid> - 2011-06-06 18:18 +0200
    Re: What's the difference between and instance and an object? Chad <cdalten@gmail.com> - 2011-06-06 09:33 -0700
      Re: What's the difference between and instance and an object? Mayeul <mayeul.marguet@free.fr> - 2011-06-06 18:54 +0200
        Re: What's the difference between and instance and an object? Chad <cdalten@gmail.com> - 2011-06-06 10:11 -0700
        Re: What's the difference between and instance and an object? Abu Yahya <abu_yahya@invalid.com> - 2011-06-08 21:21 +0530
          Re: What's the difference between and instance and an object? Abu Yahya <abu_yahya@invalid.com> - 2011-06-08 21:24 +0530
            Re: What's the difference between and instance and an object? Patricia Shanahan <pats@acm.org> - 2011-06-08 09:33 -0700
              Re: What's the difference between and instance and an object? Abu Yahya <abu_yahya@invalid.com> - 2011-06-08 22:07 +0530
          Re: What's the difference between and instance and an object? Lewis Bloch <lewisbloch@google.com> - 2011-06-10 11:06 -0700
            Re: What's the difference between and instance and an object? Abu Yahya <abu_yahya@invalid.com> - 2011-06-11 23:58 +0530
      Re: What's the difference between and instance and an object? Lewis Bloch <lewisbloch@google.com> - 2011-06-10 11:05 -0700

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