code for Get the usable space in java

import java.io.File;

public class SpaceChecker {
public static void main(String[] args) {
File[] roots = File.listRoots();

for (int i = 0; i < roots.length; i++) {
System.out.println(roots[i]);
System.out.println("Usable space = " + roots[i].getUsableSpace());
System.out.println();
}
}
}