First round of java.util.Objects for code review (bug 6797535)

[Ulf Zibis]

Am 09.10.2009 10:56, Eamonn McManus schrieb:
> Hi,
>
> Marek Kozieł wrote:
> >> +    public static boolean equals(Object a, Object b) {
> >> +        return (a == b) || (a != null && a.equals(b));
> >> +    }
> >
> > Hello,
> > I would suggest other implementation of equals method:
> >
> >     public static boolean equals(Object a, Object b) {
> >         if (a == null) return (b == null ? true : b.equals(null));
> >         if (b == null) return a.equals(null);
> >         return a.equals(b);
> >     }
> >
> > This one could cover case when null is considered as object in object
> > equals method [...]
>
> An equals implementation that can return true when its argument is 
> null violates its contract since
> it is not symmetric.  In fact, the spec of Object.equals specifically 
> says that the method must
> return false when the argument is null.
>

The spec, you mention, refers to the instance method equals(), but here 
we are talking about static helpers.

But anyway, I don't understand the point of Marek's implementation.

-Ulf