java：new File(“”,“name”)！= new file(“name”)？ (file constructor with empty string)

We have noticed this today

Since there is a file named "existing" in the PWD of java process (Windows)

new File("existing").exists() => true
new File("","existing").exists() => false
new File(".","existing").exists() => true

I expect that starting from Javadoc, the system related default directory will be "." All this was true, so it was unexpected

reflection?

thank you!

-roger-

Solution

The two parameter constructor requires the parent directory name, so the second line looks for the file with the relative path "/ existing" On Linux type systems, "/" is the root (as far as I know), so / existing is unlikely to exist On windows, I'm not sure what the default explanation is, but if I open a command line and say CD / desktop (the working directory is my user folder), it says it can't find the specified path