Check whether there are files or directories in Java

This java tutorial from Oracle:

Why are they different? It has no further explanation Does anyone know more about it? Thank you in advance!

Solution

! Files. Exists() returns:

>True if the file does not exist or cannot be determined to exist > false if the file exists

Files. Notexists() returns:

>True if the file does not exist > false if the file exists or cannot be determined

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