[taspeotis]

Which release did they add the URL class that checks for equality by connecting to the internet? 10/10

[__float]

That mis-feature has been present since Java 1.0, so (as with checked exceptions mentioned above) it's not entirely within the scope of this post.

[mrkeen]

Bitten hard by this one. I kept a set of Urls to scan. Not all my Urls made it into the set because of IP address equality.