I still have mixed feelings about this. One the one hand the methods are more specific, but on the other now we have three methods that do a cancel operation, most of them being logically equivalent. So, if avoiding a javadoc lookup is what you're after, you've just traded the lookup when trying to understand the code, for a lookup when trying to actually cancel an operation (and deciding which of the three cancel methods you want to use).

But it's probably not worth dragging this discussion any longer, so I'll cave and just add the methods :)