java計算磁盤空間的大小，jdk1.6下通過。

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("Free space = " + _file.getFreeSpace());             System.out.println("Usable space = " + _file.getUsableSpace());             System.out.println("Total space = " + _file.getTotalSpace());             System.out.println();         }                           File win = new File("C://WINDOWS");         System.out.println(win.getPath());         System.out.println(win.getName());         System.out.println("Free space = " + win.getFreeSpace());         System.out.println("Usable space = " + win.getUsableSpace());         System.out.println("Total space = " + win.getTotalSpace());         System.out.println();     } }運行結果：

D:/java>java SpaceChecker
A:/
Free space = 0
Usable space = 0
Total space = 0

C:/
Free space = 995975168
Usable space = 995975168
Total space = 4301590528

D:/
Free space = 4041146368
Usable space = 4041146368
Total space = 10756333568

E:/
Free space = 10000908288
Usable space = 10000908288
Total space = 26012024832

F:/
Free space = 0
Usable space = 0
Total space = 0

C:/WINDOWS
WINDOWS
Free space = 995975168
Usable space = 995975168
Total space = 4301590528