A question on modification of a list via a function invocation
Steve D'Aprano
steve+python at pearwood.info
Tue Sep 5 13:15:02 EDT 2017
On Tue, 5 Sep 2017 11:08 pm, Stefan Ram wrote:
> Steve D'Aprano <steve+python at pearwood.info> writes:
>>[quote]
>>The mistake they make is in the definition of
>>Figure 7: (Java) Defining a Dog pointer
>>Dog d;
>>itself. When you write that definition, you are defining a pointer to a Dog
>>object, not a Dog object itself.
>>[end quote]
>>Here Scott mixes up what the compiler does (creates a pointer to a Dog object,
>>and what the programmer's Java code does (creates a Dog).
>
> I have not the whole context in mind, and so I might get
> something wrong here, but if
>
> Dog d;
>
> is supposed to be interpreted as Java, then it neither
> creates a pointer to a Dog object nor it creates a Dog.
>
> Instead, it declares an unitialized variable d.
Thank you Stefan, your correction is noted. I'm not a Java expert like Scott,
and I failed to notice the distinction between:
Dog d;
and
Dog d = new Dog();
so I failed to realise that of course d has no value at all in Scott's example.
--
Steve
“Cheer up,” they said, “things could be worse.” So I cheered up, and sure
enough, things got worse.
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