You can now attach files to a post so here is a NetBeans project giving the classes from the original article and a test file.
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Overriding equals() in Java
Friday, 3 Oct 2014, 14:21
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Edited by Martin Thomas Humby, Saturday, 4 Oct 2014, 14:00
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Hi Martin
If you are overriding equals() you'd better be overriding hashCode() too!
arb
neo
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Hi Neil, thanks for pointing this out.
The original article this code belongs to does discuss requirements for overriding hashCode() under each of the three possible equality relationships: 1) equals not overridden in subclass so do not override hashCode(). 2) equals overridden, subclass instance can never be equal to super-class instance: override hashCode(). 3) equals overridden, but subclass instance may be equal to superclass instance when fields match those of a super: either do not override hashCode() and rely on the overridden equalFields() to sort collisions or ensure that significant field values that allow comparison with a super are then excluded from the hashCode computation.
Have added a link to the original (now that 'permalimks' are available in OU blogs and can make linking more specific than relying on tags)