exists and notExists

[Alan Bateman]

Elliotte Harold wrote:
> Why do are there both exists() and notExists() methods in 
> java.nio.file.Path? Is there some subtle issue such that notExists() 
> is not equivalent to !exists()?
>
> Otherwise, this feels like unnecessary duplication to me. I'd rather 
> have just the single exists() method.
>
An existence check yields one of three answers: the file exists, the 
file does not exist, or it can't say (due a permission problem for 
example). The exists and notExists are convenience methods for cases 
where you want to take action when a file is confirmed to exist (at that 
point in time), or confirmed to not exist.

-Alan.