Re: "This" points to other object? Why?

From:
Patricia Shanahan <pats@acm.org>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 02 Jul 2009 08:41:06 -0700
Message-ID:
<GY2dnaBzMdWJSNHXnZ2dnUVZ_vGdnZ2d@earthlink.com>
Andreas Leitgeb wrote:

Ejeep <bbshi2000@gmail.com> wrote:

    The normal output is: fh.a --this:fh@9d6
    but sometimes the output is: fh.a --this:an@c10

You probably have two instances of that class.

One of these instances is an instance of "fh" itself, while
the other is really an instance of "an", which is probably
some subclass of "fh".


Thanks for your reply.
These two classes are not relation of inheritance.


In that case, that other class "an"'s method has similar
code for logging in it, even wrongly claiming it was "fh.a".


It should be easy to distinguish the two possibilities. Change the
wording in the fh.a println call:

System.out.println("Really, truly fh.a --this:"+this);

If all outputs show the new wording, then there must be at least one
class an that extends fh, and the "an@c10" output is coming from an
instance of such a class. If the "an@c10" output does not change to the
new wording, then it is coming from another call somewhere else in the
program.

Patricia

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