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Groups > comp.lang.java.programmer > #10120

Re: Size of an arraylist in bytes

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On 11/20/2011 4:44 PM, Stefan Ram wrote:
> Eric Sosman<esosman@ieee-dot-org.invalid>  writes:
>>      If you're coming from a C background, a rough analogy is that
>> the ArrayList holds "pointers" to the objects it holds, not copies
>> of those objects.
>
>    An ArrayList /does/ hold pointers (in the sense of Java),
>    this is not just »a rough analogy«:
>
>        »(...) reference values (...) are pointers«

     They're "pointers" in Java's terms, but Java is considerably
more restrictive about what you can do with a "pointer" than C is.
You cannot, for example, print the value of a Java reference; you
can do so in C.  You cannot convert a Java reference to or from an
integer; C allows it (with traps for the unwary).  Java references
obey a type hierarchy; C's types (and hence the pointers to them)
are unrelated.  And so on, and so on: Little niggly differences.
Since Java's references support (and prohibit) a different set of
operations than C's pointers do, I maintain they're as similar as
dogs and wolves, and as different.

     Put it this way: If I had told sara "An ArrayList contains
C-style pointers to the objects it holds," would I have been
telling the truth?

-- 
Eric Sosman
esosman@ieee-dot-org.invalid

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Thread

Size of an arraylist in bytes sara <sarasara82@gmail.com> - 2011-11-20 13:01 -0800
  Re: Size of an arraylist in bytes markspace <-@.> - 2011-11-20 13:05 -0800
    Re: Size of an arraylist in bytes sara <sarasara82@gmail.com> - 2011-11-20 13:11 -0800
      Re: Size of an arraylist in bytes Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-20 21:58 +0000
      Re: Size of an arraylist in bytes markspace <-@.> - 2011-11-20 14:08 -0800
      Re: Size of an arraylist in bytes Patricia Shanahan <pats@acm.org> - 2011-11-20 14:50 -0800
      Re: Size of an arraylist in bytes Arne Vajhøj <arne@vajhoej.dk> - 2011-11-20 18:06 -0500
      Re: Size of an arraylist in bytes Lew <lewbloch@gmail.com> - 2011-11-20 20:28 -0800
  Re: Size of an arraylist in bytes Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-20 16:30 -0500
    Re: Size of an arraylist in bytes sara <sarasara82@gmail.com> - 2011-11-20 13:35 -0800
      Re: Size of an arraylist in bytes Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-20 17:19 -0500
    Re: Size of an arraylist in bytes Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-20 16:58 -0500
      Re: Size of an arraylist in bytes Patricia Shanahan <pats@acm.org> - 2011-11-20 14:04 -0800
        Re: Size of an arraylist in bytes Arne Vajhøj <arne@vajhoej.dk> - 2011-11-20 17:18 -0500
          Re: Size of an arraylist in bytes Patricia Shanahan <pats@acm.org> - 2011-11-20 14:48 -0800
            Re: Size of an arraylist in bytes Arne Vajhøj <arne@vajhoej.dk> - 2011-11-25 22:12 -0500
      Re: Size of an arraylist in bytes Lew <lewbloch@gmail.com> - 2011-11-20 20:44 -0800
        Re: Size of an arraylist in bytes Arne Vajhøj <arne@vajhoej.dk> - 2011-11-25 22:16 -0500
          Re: Size of an arraylist in bytes Lew <lewbloch@gmail.com> - 2011-11-25 20:15 -0800
  Re: Size of an arraylist in bytes Roedy Green <see_website@mindprod.com.invalid> - 2011-11-20 22:25 -0800
    Re: Size of an arraylist in bytes Arne Vajhøj <arne@vajhoej.dk> - 2011-11-25 22:11 -0500

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