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From: "bob smith" <bob.smith@1:261/38.remove-t9h-this>
Subject: Re: default equals function?
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Date: Fri, 10 Aug 2012 18:39:04 GMT
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  To: Eric Sosman
From: bob smith <bob@coolfone.comze.com>

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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