Java计算磁盘的大小

源代码如下：
 1 import java.io.File;
 2 public class SpaceChecker
 3 {
 4      public static void main(String [] args)
 5      {
 6           File[] roots=File.listRoots();
 7            for(File  _file:roots)
 8             {
 9                   System.out.println(_file.getPath());
10                   System.out.println(_file.getName()); 
11                   System.out.println("可用空间："+_file.getFreeSpace());
12                   System.out.println("已用空间："+_file.getUsabelSpace());
13                   System.out.println("总空间："+_file.getTotalSpace());
14              }
15        File win=new File("C:\\WINDOWS");
16        System.out.println(win.getPath());
17        System.out.println(win.getName());
18        System.out.println("可用空间："+win.getFreeSpace());
19        System.out.println("已用空间："+win.getUsabelSpace());
20        System.out.println("总空间："+win.getTotalSpace());
21        System.out.println();
22       }
23 }