Get free space, total space, usable space

Return	Method	Summary
long	getFreeSpace()	Returns the number of unallocated bytes in the partition named by this abstract path name.
long	getTotalSpace()	Returns the size of the partition named by this abstract pathname.
long	getUsableSpace()	Returns the number of bytes available to this virtual machine on the partition named by this abstract pathname.


import java.io.File;

public class Main {

  public static void main(String[] args) {
    File aFile = new File("c:/");
    System.out.println(aFile.getFreeSpace());
    System.out.println(aFile.getTotalSpace());
    System.out.println(aFile.getUsableSpace());
  }
}

The output:


12283260928
79990812672
12283260928

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