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| From | bob smith <bob@coolfone.comze.com> |
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: default equals function? |
| Date | Fri, 10 Aug 2012 07:12:06 -0700 (PDT) |
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On Thursday, August 9, 2012 5:11:07 PM UTC-5, Eric Sosman wrote:
> On 8/9/2012 5:58 PM, bob smith wrote:
>
> > Let's say I have a class like this:
>
> >
>
> > public class Kern_Pair {
>
> > int letter1, letter2;
>
> >
>
> > }
>
> >
>
> > Can someone tell me how the default equals function will behave?
>
> >
>
> > like
>
> >
>
> > kernpair1.equals(kernpair2)
>
> >
>
> > ?
>
>
>
> Teachable Moment.
>
>
>
> The Kern_Pair class has no equals() method of its own, so it
>
> inherits equals() from the nearest superclass that has one. Walk
>
> up the class inheritance tree to find the nearest ancestor with an
>
> equals(). The class inheritance tree for Kern_Pair is fairly short:
>
> Its immediate superclass is Object (because you didn't say "extends
>
> SomethingElse"), so the equals() method for Kern_Pair *is* the
>
> equals() method of Object.
>
>
>
> Now all you need to do is go to the Javadoc and study what
>
> Object's equals() will do.
>
>
>
> --
>
> Eric Sosman
>
> esosman@ieee-dot-org.invalid
The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).
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default equals function? bob smith <bob@coolfone.comze.com> - 2012-08-09 14:58 -0700
Re: default equals function? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-09 18:11 -0400
Re: default equals function? bob smith <bob@coolfone.comze.com> - 2012-08-10 07:12 -0700
Re: default equals function? rossum <rossum48@coldmail.com> - 2012-08-10 16:47 +0100
Re: default equals function? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-10 12:29 -0400
Re: default equals function? Jeff Higgins <jeff@invalid.invalid> - 2012-08-09 18:22 -0400
Re: default equals function? Arne Vajhøj <arne@vajhoej.dk> - 2012-08-10 13:43 -0400
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