Java计算磁盘的大小

源代码如下：

import java.io.File;
public class SpaceChecker
{
     public static void main(String [] args)
     {
          File[] roots=File.listRoots();
           for(File  _file:roots)
            {
                  System.out.println(_file.getPath());
                  System.out.println(_file.getName()); 
                  System.out.println("可用空间："+_file.getFreeSpace());
                  System.out.println("已用空间："+_file.getUsabelSpace());
                  System.out.println("总空间："+_file.getTotalSpace());
             }
       File win=new File("C:\\WINDOWS");
       System.out.println(win.getPath());
       System.out.println(win.getName());
       System.out.println("可用空间："+win.getFreeSpace());
       System.out.println("已用空间："+win.getUsabelSpace());
       System.out.println("总空间："+win.getTotalSpace());
       System.out.println();
      }
}