How to redirect java File to linux specific path

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I need to use with Java the API File.
I would like to redirect in a specific path of Linux,
the goal is that to measure the disk space of a particular
partition, but I get the result of root partition.
This is the code:

final long GIGABYTE = 1073741824;
 File file = new File("/dev/root");
 float totalSpace = file.getTotalSpace() / GIGABYTE;

Seems that file charge only the root path --> /
Could I redirect file in a specific path ?

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